2024/06/27 更新

写真a

アラカワ ジンタ
荒川 仁太
Arakawa Jinta
所属
環境生命自然科学学域 助教
職名
助教
外部リンク

学位

  • 博士(工学) ( 2020年3月   広島大学 )

研究キーワード

  • 金属疲労,破壊力学,微小き裂進展

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 材料力学、機械材料

学歴

  • 広島大学 博士(工学)    

    2020年3月

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経歴

  • 岡山大学 学術研究院環境生命自然科学学域(工)   研究准教授

    2023年10月 - 現在

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  • 広島大学デジタルものづくり教育研究センター   客員講師

    2022年7月 - 現在

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  • 岡山大学   学術研究院 環境生命自然科学学域(工)   助教

    2022年4月 - 現在

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  • 広島大学   デジタルものづくり教育研究センター   特任助教

    2020年4月 - 2022年3月

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委員歴

  • 日本鉄鋼協会 正会員  

    2022年10月 - 現在   

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  • 日本機械学会 正員  

    2020年4月 - 現在   

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  • 日本材料学会 正会員  

    2020年4月   

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論文

  • Crystal plasticity analysis of fatigue crack initiation site considering crystallographic orientation in Ti–22V–4Al alloy 査読

    Jinta Arakawa, Koki Hirazumi, Takeshi Uemori, Yoshito Takemoto

    Results in Engineering   23   2024年9月

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    掲載種別:研究論文(学術雑誌)  

    In this study, plane bending fatigue tests were conducted on Ti–22V–4Al alloy, a β-type titanium alloy, to examine the fatigue crack initiation behavior in detail. In addition, the prediction of fatigue crack initiation points was investigated from the perspectives of the Schmidt factor (SF) and crystal plasticity finite element method (CP-FEM). The slip system contributing to fatigue crack initiation can be accurately predicted by assessing the magnitude relationship of SF. Also, this prediction is already indicated in a lot of paper by using out of component of slip activity. However, the location where the fatigue crack will occur can be not estimated by SF on polycrystalline. Therefore, prediction of grains where fatigue cracks will occur could be achieved with high accuracy by constructing a CP-FEM that considers the mechanical interaction of polycrystals and grain boundary. Utilizing advanced methodologies such as CP-FEM and numerical calculation techniques, it is strictly investigated that the factors influencing fatigue crack initiation in polycrystalline materials. Our research concluded the understanding of fatigue crack initiation on polycrystal grains by considering the mechanical interaction of polycrystals and grain boundary.

    DOI: 10.1016/j.rineng.2024.102405

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  • Relationship between weld rip diameter and fatigue fracture mode for friction stir spot welded tension-peel joints 査読

    Miu Hayashi, Itsuki Fujita, Takumi Itadani, Jinta Arakawa, Yasuhiro Aoki, Hidetoshi Fujii, Hiroyuki Akebono, Atsushi Sugeta

    Fatigue and Fracture of Engineering Materials and Structures   47 ( 6 )   2127 - 2138   2024年6月

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    掲載種別:研究論文(学術雑誌)  

    In this study, the effects of variations in the weld rip diameter on fatigue properties were investigated based on the fatigue fracture mechanism using tensile peeling-type friction stir spot welding (FSSW) joints. The results of the fatigue test showed that the high and low applied force ranges exhibited base metal fracture and weld area fracture, respectively, and the difference in the weld rip diameter hardly affected the fatigue life. In contrast, in the middle-applied force range, the fracture morphology changes as the weld rip diameter decreases, and it is apparent that joints exhibiting weld area fracture decrease the fatigue life. The fatigue fracture morphology of the tensile peeling-type FSSW joints can be described by a competing risk model between the weld rip diameter. Increasing the heat input during joining, thereby increasing the crack propagation resistance at the pressure fusion interface, can suppress weld area fracture.

    DOI: 10.1111/ffe.14295

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  • Fatigue Limit Diagram for Ferritic Stainless Steels Subjected to Excess Deformation under Fixed Maximum Stress Conditions 査読

    Miu Hayashi, Takeshi Ando, Ryohei Gonda, Keishi Kitabatake, Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta

    Materials Transactions   65 ( 5 )   512 - 517   2024年

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    掲載種別:研究論文(学術雑誌)  

    In this study, experimental investigations were conducted to create fatigue limit diagrams for NSSC180 ferritic stainless steel, which is used for automobile exhaust system parts, subjected to excess deformation, in order to clarify the relationship between the mean stress and fatigue limit. The fatigue tests were conducted under a fixed maximum stress, which allowed a fatigue design diagram to be obtained. The results indicated that the fatigue limit curve has a region where the effect of increasing the mean stress on the decrease in the fatigue limit is more moderate than that predicted by a modified Goodman line. Furthermore, it was found that a fatigue design based on static crack initiation is more appropriate than the modified Goodman line for higher values of mean stress.

    DOI: 10.2320/matertrans.MT-Z2023016

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  • Elucidation of Fatigue Fracture Mechanism on Glass-Fiber-Reinforced-Plastics 査読

    J. Arakawa, M. Sakai, M. Hayashi, H. Akebono, A. Sugeta, J. Ohshita, H. Tanizawa, K. Shimizu, J. Ogawa

    Lecture Notes in Mechanical Engineering   213 - 222   2024年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    In this study, it was elucidated that the fatigue failure mechanism of glass-fiber reinforced plastics (GFRP) with different fiber orientations, and the relationship between the fiber orientation and the failure mechanism by using a simple unidirectional fiber orientation. Fatigue tests exhibited that GFRP, whose glass fiber oriented parallel to the load direction showed high fatigue strength. Furthermore, as a result of observing the fatigue fracture, in the case of GFRP containing fibers oriented parallel to the loading direction, fatigue cracks occur at the fiber edges, propagated through between the glass fibers and the matrix. After that, the fatigue crack propagation rate gradually decreases, the fatigue crack growth stopped, and finally, GFRP material was statically fractured. Therefore, this suggests that the increase in fiber length of fibers oriented parallel to the loading direction extends the fatigue crack propagation life, leading to an increase in total fatigue life.

    DOI: 10.1007/978-981-99-8643-9_24

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  • Molding and Structure Co-Analysis of Injection Molding Composites Considering Heterogeneity in the Thickness Direction+1 査読

    Chikara Kawamura, Yasuhiro Morita, Mitsugi Fukahori, Masanori Honda, Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta

    Materials Transactions   65 ( 2 )   184 - 193   2024年

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    掲載種別:研究論文(学術雑誌)  

    During automobile crashes, the main behavior of plastics in the vehicle is bending deformation. Because of this, it is important to accurately calculate the edge stress and allowable stress on structural surfaces. For that purpose, it is necessary to consider the distribution of the fiber orientation angle and degree in the plate thickness direction. In a general coupled analysis for injection-molded materials, a material model is created based on the physical properties obtained from an arbitrary test piece. Therefore, even if the orientation angle in each part to be analyzed is taken into consideration, the degree of orientation is constant in each part, and the degree of orientation distribution in the plate thickness direction is also treated as constant. We tried to improve the accuracy of crash analysis by calculating the edge stress and allowable stress with high accuracy by considering the distribution of orientation angle and degree in the plate thickness direction. For that purpose, we created a model that calculates properties of composite materials from resin and fiber properties, and a process that maps the distribution of orientation angle and degree in the plate thickness direction to each integration point of the shell element in structural molding analysis.

    DOI: 10.2320/matertrans.MT-Z2023012

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  • 過大変形を受けたフェライト系ステンレス鋼における最大応力固定条件下での疲労限度線図 査読

    林 美佑, 安藤 武史, 權田 良平, 北畠 啓史, 荒川 仁太, 曙 紘之, 菅田 淳

    材料   72 ( 7 )   535 - 541   2023年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:京都 : 日本材料学会  

    DOI: 10.2472/jsms.72.535

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    その他リンク: https://ndlsearch.ndl.go.jp/books/R000000004-I032985421

  • Effect of pre-water immersion period on fatigue resistance of adhesive bonded thin steel 査読

    Jinta Arakawa, Wataru Jinnouchi, Hiroyuki Akebono, Atsushi Sugeta

    Int. J. Fatigue   174   107725   2023年5月

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    掲載種別:研究論文(学術雑誌)  

    In this study, two types of adhesive bonded joints whose base materials are JIS SPCC590Y and JIS SUS316, respectively, were examined to determine the fatigue strength and fracture morphology after water immersion. The fatigue strength and cohesive failure rate of the adhesive bonded joints with JIS SPCC590Y adherends significantly decreased, with a similar tendency to that of the static tensile test. However, the fatigue strength of the JIS SUS316-adherend joints decreased slightly, and the cohesive failure rate increased. Oxides, etc., were generated at the bonding interface after long-term use in structures that were adhesively bonded to adherends such as JIS SPCC590Y with poor corrosion resistance, and the bonded interface strength rapidly decreased. By contrast, for the adherends with excellent corrosion resistance, interfacial failure did not occur but cohesive failure did; as a result, both static and fatigue presented high strength.

    DOI: 10.1016/j.ijfatigue.2023.107725

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  • Combined effect of surface morphology and residual stress induced by fine particle and shot peening on the fatigue limit for carburized steels 査読

    Shoichi Kikuchi, Kenta Minamizawa, Jinta Arakawa, Hiroyuki Akebono, Shogo Takesue, Mamoru Hayakawa

    International Journal of Fatigue   168   107441   2023年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ijfatigue.2022.107441

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  • 複合荷重を考慮した自動車用フレームの断面形状の検討について 査読

    河村 力, 本田 正徳, 荒川 仁太, 曙 紘之, 菅田 淳

    自動車技術会論文集   54 ( 4 )   2023年

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  • 射出成形複合材の繊維配向の不均質性を考慮した自動車用H型部材の成形-構造連成解析の検討 査読

    河村 力, 森田 泰博, 深堀 貢, 本田 正徳, 荒川 仁太, 曙 紘之, 菅田 淳

    材料   2023年

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  • 射出成形複合材の板厚方向の繊維配向不均質性を考慮した 成形-構造連成解析手法の検討 査読

    河村 力, 森田 泰博, 深堀 貢, 本田 正徳, 荒川 仁太, 曙 紘之, 菅田淳

    材料   72 ( 9 )   675 - 682   2023年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:京都 : 日本材料学会  

    DOI: 10.2472/jsms.72.675

    DOI: 10.2472/jsms.73.165_references_DOI_KQc3HDXeAmhhzjtKhEbsC7RDJ4L

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  • Estimation of the fatigue crack initiation site and life of Ti-6Al-4V alloy for two types of circle and slender crystal grains

    Jinta Arakawa, Yuya Kawahara, Yukihiko Kimura, Shotaro Hashimoto, Hiroyuki Akebono, Atsushi Sugeta

    International Journal of Fatigue   181   2023年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ijfatigue.2023.108097

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  • An evaluation of fatigue crack initiation in Ti-6Al-4V alloy by Schmid factor 査読

    Jinta Arakawa, Hiroki Sato, Ryosuke Handa, Yukihiko Kimura, Shotaro Hashimoto, Hiroyuki Akebono, Atsushi Sugeta

    MATERIALS SCIENCE AND TECHNOLOGY   39 ( 5 )   557 - 566   2022年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    A plane bending fatigue test was conducted on Ti-6Al-4V, and the crystal grains where the fatigue crack initiated were identified from the crystal orientation map obtained by using the EBSD method. In addition, the slip system, which generated the fatigue crack initiation, was identified by calculating the out-of-plane component of the Schmid factor (SF) of each slip system. As a result, fatigue cracks were found to occur owing to basal slip. In this study, the out-of-plane component of the SF was mapped by considering the effect of the crystal grain size. The results clarified that the number of crystal grains where fatigue crack may initiate can be limited by using the out-of-plane component of the SF and the grain size.

    DOI: 10.1080/02670836.2022.2127982

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  • Effect of fiber orientation on the fatigue crack initiation and propagation of glass fiber reinforced plastics 査読

    Michiya Sakai, Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta, Joji Ohshita, Hiroki Tanizawa, Katsunori Shimizu, Junichi Ogawa

    JOURNAL OF APPLIED POLYMER SCIENCE   139 ( 44 )   2022年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    In recent years, glass-fiber-reinforced plastic (GFRP) applications have expanded. This study elucidates the fatigue fracture mechanism of GFRP with different fiber orientations and experimentally clarifies the relationship between fiber orientation and fracture mechanism by using specimens with unidirectional simple fiber orientations. First, Static tensile and fatigue tests are performed on two types of specimens with fibers oriented in a single direction (parallel to the load axis and orthogonal to the load axis), and it is found that specimens with a single fiber orientation parallel to the load axis shows higher strength in both tests. Next, In the case of GFRP with fibers oriented parallel to the load axis, it is found that fatigue loading causes fatigue crack initiation at the fiber ends, followed by fiber localized debonding due to crack propagation at the fiber-matrix interface and that the crack propagation rate gradually decreases and stops. Therefore, this suggests that the increase in fiber length of fibers oriented parallel to the load axis in GFRP leads to an increase in the crack propagation life at the fiber-matrix interface, which leads to an increase in fatigue life.

    DOI: 10.1002/app.53088

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  • Fatigue limit estimation for carburized steels with surface compressive residual stress considering residual stress relaxation 査読

    Kenta Minamizawa, Jinta Arakawa, Hiroyuki Akebono, Koichiro Nambu, Yuki Nakamura, Mamoru Hayakawa, Shoichi Kikuchi

    INTERNATIONAL JOURNAL OF FATIGUE   160   2022年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The mechanism of residual stress relaxation for carburized steels was elucidated and their fatigue limit was estimated. The compressive residual stress in the carburized steel after rotating bending fatigue tests is mainly influenced by the relaxation during the compressive loading phase, although it increases at the early stage. The fatigue limit of carburized steels can be estimated according to the modified Goodman diagram considering the residual stress relaxation. The proposed equation shows the maximum value of the fatigue limit (1013 MPa) of carburized steel and the maximum value of the compressive residual stress contributing to the increased fatigue limit.

    DOI: 10.1016/j.ijfatigue.2022.106846

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  • Effects of welding defects on the fatigue properties of spot welded automobile steel sheets and the establishment of a fatigue life evaluation method 査読

    Yuki Ogawa, Ichiro Ohara, Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta

    WELDING IN THE WORLD   66 ( 4 )   745 - 752   2022年4月

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    記述言語:英語   出版者・発行元:SPRINGER HEIDELBERG  

    The welded areas of spot welding of actual vehicles are confirmed welding defects such as blowholes between steel plates. However, most of studies on the strength reliability of spot welded structures do not consider welding defects, and it is necessary to clarify the effects of weld defects on the strength reliability of spot welded structures. This study investigated the effect of the size and location of through holes simulating welding defects on the fatigue properties of tensile-shear-type spot welded joints using automobile steel sheets. Moreover, the effect of the loading type both tensile-shear and cross-tension type on the fatigue properties of the spot welded joints was investigated, and a unified evaluation of the fatigue life for different loading type joints was established. The size and location of a welding defect do not affect the fatigue strength or the fatigue fracture morphologies of tensile-shear-type spot welded joints. This is because the slit tip of spot welded joints is in the singularity stress field under mixed-mode condition, regardless of the welding defect of the joint. Therefore, the equivalent stress intensity factor at the slit tips of joints can uniformly evaluate the fatigue life of joints with different loading types.

    DOI: 10.1007/s40194-021-01238-5

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  • Effect of Linear Weld Angle on Fatigue Strength of phi-Shaped Laser Welded Joints 査読

    Tomohiro Sannomiya, Daisuke Nakamura, Jinta Arakawa, Tadashi Kado, Tomohito Tsudo, Seiya Takahashi, Masashi Hiraoka, Hiroyuki Akebono, Atsushi Sugeta

    MATERIALS TRANSACTIONS   63 ( 4 )   570 - 578   2022年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN INST METALS & MATERIALS  

    In this study, to clarify the weld area shape that achieves excellent fatigue properties in laser welded joints, an phi-shaped weld, which is a combination of a circular weld and a linear weld, was selected for evaluation. Joints with a linear weld having three different linear weld angles with respect to the load axis were fabricated and fatigue tests were conducted. The results showed that the effect of the linear weld angle was remarkable in a relatively high loading amplitude range, and the fatigue life increased as the angle increased. In addition, three-dimensional observation of fatigue cracks was carried out to investigate the fracture mechanism and the factors causing the difference in fatigue strength. It was clarified that the crack propagation life is increased because the crack propagates in the thickness direction not only at circular weld area but also at the linear weld area, when the linear weld angle respecting to loading direction are 45 degrees, 90 degrees. Furthermore, three-dimensional FEM analysis was carried out to recognize the stresses field around the linear weld area. It was clarified that the stresses around the weld area were distributed as the linear weld angle increased, which delayed crack initiation, leading to excellent fatigue properties. Therefore, the fatigue life in the high test-force amplitude region can he improved by providing a weld area shape that distributes the stress and allows the crack to propagate in the thickness direction.

    DOI: 10.2320/matertrans.MT-M2021223

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  • Analysis of Fatigue Crack Propagation Behavior of Structures with One-Sided Welding in Fillet Welded Joint for Load-Carrying Type 査読

    Takamasa Abe, Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta

    MATERIALS TRANSACTIONS   63 ( 7 )   1037 - 1045   2022年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN INST METALS & MATERIALS  

    The structures of a hydraulic excavator with one-sided welded joints are investigated in this study. We investigated the fatigue lifetime evaluation method using S-version FEM. Especially we considered combination of cracks from multiple crack origins. Moreover, to achieve a more precise evaluation, we obtained the crack growth rate of the excavator weld using the unloading elastic compliance method instead of some engineering standard values. Results show that, the fatigue lifetime obtained from the analysis of all width crack; type1 - all cracks named in this study is extremely short compared with test results. Considering the combination of cracks from multiple crack origins, the S-version FEM provides an evaluation similar fatigue lifetime of a test piece imitating the excavator.

    DOI: 10.2320/matertrans.MT-Z2022003

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  • Elucidation of fatigue characteristics and fracture mechanism of friction stir spot-welded tension-shear joint steels 査読

    Thomasprabhu Selvaraj, Shogo Ishida, Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta, Yasuhiro Aoki, Hidetoshi Fujii

    FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES   44 ( 1 )   74 - 84   2021年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    The fatigue life and fracture mechanism of friction stir spot welded tension-shear joints using 590-MPa class steel as a base material under constant-amplitude conditions were investigated with focus on welding dimension variations caused by tool wear. The fatigue limit of the friction stir spot welding (FSSW) joint used for this study is significantly low compared with the static tensile strength of the joint itself. It was clarified that the FSSW joint in this study exhibited two different failure morphologies regardless of the applied load level: base metal fracture and weld area fracture. Although the welding state changes due to the tool wear phenomenon that produce two types of fracture modes in relation to the welding rip diameter, they have no effect on the fatigue strength, regardless of the applied load.

    DOI: 10.1111/ffe.13332

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  • Life prediction of oxide dispersion-strengthened platinum–rhodium alloy subjected to high-temperature bending fatigue under axial stress 査読

    A. Niwa, Y. Akita, J. Arakawa, H. Akebono, A. Sugeta

    International Journal of Fatigue   140   2020年11月

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    掲載種別:研究論文(学術雑誌)  

    In this study, the bending fatigue properties of an oxide dispersion-strengthened platinum–rhodium alloy subjected to axial stress at 1400 °C were evaluated, and the effects of the axial stress and life prediction methods were examined. When the axial stress increased, the fracture mechanism changed from fatigue fracture to creep fracture, thus reducing the fracture time. The creep rupture time due to the stress generated at the center of the thickness direction was compared with the fatigue failure time due to the stress amplitude of the surface; the shorter one corresponded to the main fracture mechanism. Creep rupture was the main factor affecting the stress levels of the actual equipment, and its life should be predicted according to the creep rupture time.

    DOI: 10.1016/j.ijfatigue.2020.105808

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  • Evaluating the fatigue limit of metals having surface compressive residual stress and exhibiting shakedown 査読

    Jinta Arakawa, Tatsuya Hanaki, Yoshiichirou Hayashi, Hiroyuki Akebono, Atsushi Sugeta

    FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES   43 ( 2 )   211 - 220   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    The objective of the study described in this article is to evaluate the effect of shakedown of surface compressive residual stresses introduced by shot peening on fatigue limit of stainless steel. First, the tension-compression fatigue tests were conducted on ASTM CA6NM specimens under controlled load and displacement conditions to acquire a fatigue limit diagram under various compressive mean stress. The results showed that shakedown of negative mean stress occurs under controlled displacement. We then carried out in-plane-bending fatigue tests under controlled load conditions on welded ASTM 309 stainless steel specimens with surface compressive residual stress introduced by ultrasonic shot peening. The results provide a fatigue limit of 415 MPa, which agrees with the value of 404 MPa calculated based on a modified Goodman line considering shakedown. Therefore, it is suggested that the surface layer is restricted by the internal bulk that creates controlled displacement conditions and the shakedown of surface compressive residual stress occurs.

    DOI: 10.1111/ffe.13097

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  • Effect of Shakedown on the Fatigue Limit of Ultrasonic Shot Peened Steel 査読

    Jinta Arakawa, Yoshiichirou Hayashi, Hiroyuki Akebono, Atsushi Sugeta

    ADVANCED SURFACE ENHANCEMENT, INCASE 2019   69 - 75   2020年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER-VERLAG SINGAPORE PTE LTD  

    We performed in-plane bending fatigue tests under controlled load conditions on ASTM 309 stainless steel specimens with surface compressive residual stress. The results provide a fatigue limit of 415 MPa, which agrees with the value of 404 MPa calculated based on a modified Goodman line considering shakedown. Therefore, the surface layer was clearly restricted by the internal bulk and was relieved under controlled displacement, after which shakedown occurred. Then, the fatigue limit of the metal material with surface compressive residual stress should be estimated by using a modified Goodman line considering shakedown to avoid unexpected fractures that could occur by following a modified Goodman line that does not consider shakedown.

    DOI: 10.1007/978-981-15-0054-1_8

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  • Effectiveness of Ultrasonic Shot Peening on Stainless Cast Steel SCS6 Containing a Fatigue Crack 査読

    Jinta Arakawa, Yoshiichirou Hayashi, Hiroyuki Akebono, Atsushi Sugeta

    MATERIALS TRANSACTIONS   61 ( 8 )   1593 - 1599   2020年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN INST METALS & MATERIALS  

    In order to investigate the effectiveness of ultrasonic shot peening treatment (USP) as repairing method for SCS6 material with surficial fatigue crack for hydraulic turbine runner, plane bending fatigue tests were carried out for USP treated SCS6 containing a surface fatigue crack with 1 mm in length and the fatigue crack propagation after USP was observed by a plastic replica method. As a result, the fatigue crack propagation life of SCS6 containing a surface fatigue crack was dramatically improved by USP treatment. Furthermore, the initial effective stress intensity factor ranges were calculated in the USP treated and untreated SCS6 containing a surface fatigue crack, respectively. According to the calculation, it was clear that the surficial fatigue crack could be harmless under the condition that the calculated initial effective stress intensity factor range considering the stress opening a fatigue crack, which was acquired by the unloading elastic compliance method, was less than the threshold of effective stress intensity factor range. Therefore, USP treatment is effective for repairing method of SCS6 containing surficial fatigue crack for hydraulic turbine runner.

    DOI: 10.2320/matertrans.Z-M2020829

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  • The effects of crystallographic orientation on fatigue crack initiation behavior in Ti-6Al-4V 査読

    Shun Sasaoka, Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta, Yoshihisa Shirai, Eisuke Nakayama, Yukihiko Kimura

    INTERNATIONAL JOURNAL OF FATIGUE   117   371 - 383   2018年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The influence of microstructure on crack initiation behavior of Ti-6Al-4V was investigated by using atomic force microscope (AFM) and electron backscattered diffraction (EBSD). This research considers the effects of both the Schmid factor (SF) value and the slip direction of the grain on fatigue crack initiation sites. The result shows that fatigue cracks tend to form basal slips in primary alpha grains. In addition, these cracks are generated from primary alpha grains with relatively high basal SF values. However, it was found that fatigue cracks do not necessarily originate from basal planes of primary alpha grain with the maximum SF value. Finally, a new parameter that combines SF and the slip angle Omega (slip angle Omega is the angle between the specimen surface and the slip direction) was suggested and that parameter enables to predict fatigue crack initiation sites, since it was revealed that fatigue cracks initiated from primary alpha grains with high SFsin Omega values.

    DOI: 10.1016/j.ijfatigue.2018.07.039

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  • Effect of surface compressive residual stress introduced by surface treatment on fatigue properties of metallic material 査読

    Jinta Arakawa, Tatsuya Hanaki, Yoshiichirou Hayashi, Hiroyuki Akebono, Atsushi Sugeta

    12TH INTERNATIONAL FATIGUE CONGRESS (FATIGUE 2018)   165   2018年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:E D P SCIENCES  

    This study considers shakedown in evaluating the fatigue limit of metals with compressive residual stress at the surface. We begin by applying tension-compression fatigue tests to ASTM CA6NM under conditions of controlled load and displacement to obtain fatigue limit diagram in compressive mean stress. The results imply that shakedown occurs under the condition of controlled displacement, therefore, shakedown should be considered when evaluating the fatigue limit of metals with compressive residual stress at the surface.

    DOI: 10.1051/matecconf/201816518006

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  • Fatigue strength of USP treated ASTM CA6NM for hydraulic turbine runner 査読

    J. Arakawa, M. Kakuta, Y. Hayashi, R. Tanegashima, H. Akebono, M. Kato, A. Sugeta

    Surface Engineering   30 ( 9 )   662 - 669   2014年9月

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    掲載種別:研究論文(学術雑誌)  

    In order to investigate the effect of an ultrasonic shot peening (USP) treatment on the fatigue characteristics of structural materials for hydroelectric facilities, plane bending fatigue tests were carried out using USP treated ASTM CA6NM stainless cast steel. The results showed that the fatigue limit of the USP material was approximately 60% higher than that of the untreated material. Haigh's diagram evaluation suggested that an increase in crack initiation resistance associated with the high hardness and compressive residual stress by USP treatment was the main reason for the improvement in fatigue strength. Furthermore, the simulation of fatigue crack propagation implied that compressive residual stress leads to a low crack propagation rate compared with the untreated material. Consequently, it is clear that the USP treatment is an effective process for improving the fatigue properties of CA6NM.

    DOI: 10.1179/1743294414Y.0000000308

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  • Effect of ultrasonic shot peening on the fatigue strength of stainless cast steel ASTM CA6NM for hydraulic turbine runner 査読

    Jinta Arakawa, Motoki Kakuta, Yoshiichirou Hayashi, Ryota Tanegashima, Hiroyuki Akebono, Masahiko Kato, Atsushi Sugeta

    Advanced Materials Research   891-892   649 - 655   2014年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    In this paper, in order to investigate the effect of the ultrasonic shot peening (USP) treatment on fatigue characteristics of the structural materials for hydroelectric facilities, plane bending fatigue tests were carried out using stainless cast steel ASTM CA6NM performed by USP treatment. The fatigue test results showed that the fatigue strength of the USP materials was approximately 60% higher than that of the untreated materials. In order to examine the reason for that, the effect of USP treatment on fatigue crack initiation behavior was evaluated based on the Haigh's diagram. This evaluation implied that increasing the crack initiation resistance associated with high hardness and high compressive residual stress at surface by USP treatment is the major cause for the improvement of fatigue strength. Furthermore, the effect of USP treatment on fatigue crack propagation behavior was also examined by simulating the crack growth rate considering the stress intensity factor at crack tip. Crack propagation simulation results suggested that compressive residual stress leads crack growth rate slow compared with untreated material. © (2014) Trans Tech Publications, Switzerland.

    DOI: 10.4028/www.scientific.net/AMR.891-892.649

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MISC

  • 射出成形複合材の繊維配向の不均質性を考慮した自動車用H型部材の成形-構造連成解析の検討—A Study of Molding-Structure Co-Analysis for Automotive H-Shaped Components Considering Fiber Orientation Heterogeneity in Injection Molded Composites

    河村 力, 森田 泰博, 深堀 貢, 本田 正徳, 荒川 仁太, 曙 紘之, 菅田 淳

    材料 / 日本材料学会 [編]   73 ( 2 )   165 - 171   2024年2月

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    記述言語:日本語   出版者・発行元:京都 : 日本材料学会  

    DOI: 10.2472/jsms.73.165

    CiNii Books

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    その他リンク: https://ndlsearch.ndl.go.jp/books/R000000004-I033349014

  • Quantitative evaluation of fatigue crack initiation on Ti-6Al-4V alloy by using Schmid factor

    Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta

    2023年7月

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  • 複合荷重を考慮した自動車用フレームの断面形状の検討について

    河村 力, 本田 正徳, 荒川 仁太, 曙 紘之, 菅田 淳

    自動車技術会論文集   54 ( 4 )   738 - 744   2023年

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    記述言語:日本語   出版者・発行元:公益社団法人 自動車技術会  

    軽量化と衝突安全性能の両立のため,車体フレームを対象に多目的最適化を用いて,断面を拡大することなく曲げ強度とねじりの強度を向上しつつ、軽量化可能な断面形状を導出した.更に,力学的に考慮した設計空間とすることで,曲げ強度とねじり強度の機能配分による最適断面の遷移を示し、それを座屈の視点から説明した.

    DOI: 10.11351/jsaeronbun.54.738

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  • レーザパターニング表面処理による高耐久性能を実現する接着接合接手の開発

    荒川 仁太

    天田財団助成研究成果報告書   36   401   2023年

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    記述言語:日本語   出版者・発行元:公益財団法人 天田財団  

    DOI: 10.32163/amadareport.36.0_401

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    その他リンク: https://ndlsearch.ndl.go.jp/books/R000000004-I033295853

  • 大きな予ひずみを考慮した疲労限度線図の作成

    林美佑, 安藤武史, 權田良平, 北畠啓史, 荒川仁太, 曙紘之, 菅田淳

    日本材料学会学術講演会講演論文集(CD-ROM)   71st   2022年

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  • Al異材FSSW継手の疲労き裂挙動におよぼすツール形状の影響

    野瀬悠生, 北川和也, 荒川仁太, 曙紘之, 杉本幸弘, 菅田淳

    日本材料学会学術講演会講演論文集(CD-ROM)   71st   2022年

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  • Establishment of Fatigue Limit Diagrams for Stainless Steels Subjected to Excessive Deformation

    2022年

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  • 摩擦攪拌点接合と接着剤を併用したCFRP/Alウェルドボンド継手の疲労強度評価

    峯岡誠太郎, 荒川仁太, 小川裕樹, 曙紘之, 杉本幸弘, 菅田淳

    疲労シンポジウム講演論文集   35th   2022年

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  • 過大な予ひずみを考慮した最大応力固定条件における疲労限度線図の作成

    林美佑, 安藤武史, 權田良平, 北畠啓史, 荒川仁太, 曙紘之, 菅田淳

    疲労シンポジウム講演論文集   35th   2022年

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  • レーザパターニング処理を援用した接着接合継手の疲労強度評価

    臼井康貴, 四ツ谷隆太, 曙紘之, 菅田淳, 荒川仁太

    疲労シンポジウム講演論文集   35th   2022年

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  • 引張はく離型自動車用鋼板FSSW継手の破壊機構解明

    板谷拓実, 藤田一輝, 荒川仁太, 曙紘之, 菅田淳, 青木祥宏, 藤井英俊

    日本材料学会学術講演会講演論文集(CD-ROM)   71st   2022年

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  • ガラス短繊維PPのき裂発生および進展に及ぼす繊維配向の影響

    酒井宙也, 荒川仁太, 志水克教, 小川淳一, 谷澤浩樹, 大下浄治, 曙紘之, 菅田淳

    日本材料学会学術講演会講演論文集(CD-ROM)   71st   2022年

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  • 表面性状および圧縮残留応力解放を考慮した浸炭焼入れ鋼の疲労限度推定

    南澤 健太, 武末 翔吾, 荒川 仁太, 曙 紘之, 南部 紘一郎, 中村 裕紀, 菊池 将一

    M&M材料力学カンファレンス   2021   OS0818   2021年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmemm.2021.os0818

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  • Al/CFRP異材点接合継手の二段変動荷重下における疲労特性評価

    峯岡 誠太郎, 中原 文弥, 荒川 仁太, 小川 裕樹, 曙 紘之, 田中 耕二郎, 菅田 淳

    M&M材料力学カンファレンス   2021   OS0826   2021年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmemm.2021.os0826

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  • Evaluation of fatigue life under block loading including cycles below the fatigue limit up to very high cycle regime

    2021年

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  • エラストマーの疲労強度におよぼす形状特性とフィラーの粒子径の影響

    林圭亮, 荒川仁太, 甲斐裕之, 大竹恵子, 岡崎博昭, 大下浄治, 曙紘之, 菅田淳

    破壊力学シンポジウム講演論文集   20th   2021年

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  • 接着接合継手の疲労き裂進展速度におよぼす水劣化の影響とその定量的評価

    橘知哉, 荒川仁太, 曙紘之, 菅田淳

    破壊力学シンポジウム講演論文集   20th   2021年

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  • 極微視的観察による金属材料の微小き裂進展機構の解明

    伊藤颯茉, 荒川仁太, 曙紘之, 菅田淳

    日本材料学会学術講演会講演論文集(CD-ROM)   70th   2021年

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  • フェライト系ステンレス鋼の疲労限度におよぼす予ひずみの影響

    林美佑, 權田良平, 北畠啓史, 荒川仁太, 曙紘之, 菅田淳

    日本材料学会学術講演会講演論文集(CD-ROM)   70th   2021年

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  • Fatigue Crack Behavior on Thin Steel Sheets Welded by Friction Stir Spot Welding

    2020年5月

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  • 疲労き裂を有するステンレス鋳鋼SCS6に対するUSP処理の有効性に関する研究

    荒川 仁太, 林 義一郎, 曙 紘之, 菅田 淳

    材料   68 ( 12 )   897 - 903   2019年12月

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    記述言語:日本語   出版者・発行元:公益社団法人 日本材料学会  

    DOI: 10.2472/jsms.68.897

    CiNii Article

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    その他リンク: http://id.ndl.go.jp/bib/030144549

  • Quantitative evaluation of small fatigue crack deflection behavior in metals based on T-stress

    Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta

    2019年9月

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  • 表層に圧縮残留応力を有する金属材料の疲労限度推定手法

    荒川仁太, 曙紘之, 菅田淳, 林義一郎

    機械・構造物の強度設計,安全性評価に関するシンポジウム前刷集   16th   2019年

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  • α-黄銅における微小疲労き裂の微視的観察および結晶方位解析を用いた屈曲挙動予測

    小林壮, 荒川仁太, 曙紘之, 菅田淳

    日本材料学会学術講演会講演論文集   68th   2019年

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  • レーザースポット溶接による薄板鋼板接合継手の疲労破壊機構の解明

    三宮知大, 中村大祐, 荒川仁太, 曙絋之, 山本元道, 菅田淳

    溶接構造シンポジウム講演論文集(CD-ROM)   2019   2019年

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  • レーザースポット溶接による薄板鋼板接合継手の疲労特性評価

    中村大祐, 三宮友大, 荒川仁太, 曙紘之, 山本元道, 菅田淳

    機械・構造物の強度設計,安全性評価に関するシンポジウム前刷集   16th   2019年

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  • EVALUATION OF FATIGUE CRACK INTIATION SITE ON TI-6AL-4V BASED ON SCHMID FACTOR

    Jinta ARAKAWA, Hiroki SATO, Hiroyuki AKEBONO, Atsushi SUGETA, Yoshihisa SHIRAI, Eisuke NAKAYAMA, Yukihiko KIMURA

    2018年9月

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  • α-黄銅の微小疲労き裂屈曲挙動観察ならびに結晶方位に基づく屈曲挙動予測

    佐藤祐希, 荒川仁太, 曙紘之, 菅田淳

    日本材料学会学術講演会講演論文集   67th   2018年

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  • き裂先端における応力場による微小疲労き裂屈曲挙動の数値的評価

    荒川仁太, 小林壮, 曙紘之, 菅田淳

    疲労シンポジウム講演論文集   34th   2018年

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  • α-黄銅における微小き裂進展挙動のすべり因子による定量的評価

    荒川仁太, 佐藤祐希, 曙紘之, 菅田淳

    高温強度シンポジウム前刷集   55th   2017年

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  • AFMを援用したα-黄銅の微小疲労き裂進展挙動のその場観察

    佐藤祐希, 荒川仁太, 曙紘之, 菅田淳

    機械・構造物の強度設計,安全性評価に関するシンポジウム前刷集   15th   2017年

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  • Effect of Ultrasonic Shot Peening on the Fatigue Strength of SCS6 for Hydraulic Turbine Runner

    Jinta Arakawa, Motoki Kakuta, Yoshiichirou Hayashi, Hiroyuki Akebono,Masahiko Kato,Atsushi Sugeta

    2014年3月

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  • G0310601 超音波ショットピーニング処理による発電用水車ランナ材SCS6の疲労強度改善(材料力学部門一般セッション:表面処理・改質)

    荒川 仁太, 林 義一郎, 種子島 亮太, 曙 紘之, 加藤 昌彦, 菅田 淳

    年次大会   2014   _G0310601- - _G0310601-   2014年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmemecj.2014._g0310601-

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  • 発電用水車ランナ材SCS6の疲労特性に及ぼす超音波ショットピーニングの影響

    荒川仁太, 角田志樹, 曙紘之, 加藤昌彦, 菅田淳, 林義一郎

    日本材料学会学術講演会講演論文集   62nd   2013年

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  • OS2110 発電水車用ステンレス鋳鋼SCS6の疲労き裂発生・進展挙動に及ぼす超音波ショットピーニングの影響

    角田 志樹, 荒川 仁太, 林 義一郎, 曙 紘之, 加藤 昌彦, 菅田 淳

    M&M材料力学カンファレンス   2012   _OS2110-1_ - _OS2110-3_   2012年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmemm.2012._os2110-1_

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▼全件表示

受賞

  • 研究功績賞

    2024年3月   岡山大学工学部  

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  • 令和3年度日本材料学会学術奨励賞

    2022年5月  

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  • 令和2年度日本材料学会疲労部門委員会論文賞

    2021年5月  

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共同研究・競争的資金等の研究

  • 機械的効果と化学的効果を援用したCN対応革新的マルチマテリアル接合技術の開発

    研究課題/領域番号:23K03593  2023年04月 - 2026年03月

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    曙 紘之, 小川 裕樹, 荒川 仁太

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    配分額:4680000円 ( 直接経費:3600000円 、 間接経費:1080000円 )

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  • 高耐久性能を有する架橋型ガラス繊維複合レーザー溶接継手の開発

    研究課題/領域番号:22K14148  2022年04月 - 2025年03月

    日本学術振興会  科学研究費助成事業 若手研究  若手研究

    荒川 仁太

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    配分額:4680000円 ( 直接経費:3600000円 、 間接経費:1080000円 )

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  • エタノール射出型ジェットピーニングによる高耐久性を発現する接着接合技術の開発

    研究課題/領域番号:20K22395  2020年09月 - 2022年03月

    日本学術振興会  科学研究費助成事業 研究活動スタート支援  研究活動スタート支援

    荒川 仁太

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    配分額:2860000円 ( 直接経費:2200000円 、 間接経費:660000円 )

    本研究では,接着接合体の耐久性能を向上させることを目的として,被着材表面にエタノール射出型のジェットピーニングを施すこととした.これより,接着接合体の強度向上となる支配因子であるアンカー効果,濡れ性,水素結合の効果を増強させることが期待できる.
    これに対して,今年度は表面処理を施していない試験片を対象に接着接合体の耐久性能を把握した.また,実機では水劣化を生じることが想定されるので,水劣化の影響も併せて検討した.結果として,母材をSPCC材およびSUS材の両者において,耐久性能試験での破壊形態は接着層内部にき裂進展を呈する凝集破壊であった.また,水劣化を生じさせた試験片に関しては,SUS材においては水劣化無の試験片と比較して疲労強度に大きな差異はなかったが,一方でSPCC材においては水劣化によって大きく疲労強度が低下した.これは,SPCC材においては,水劣化によって接着層と母材の界面強度が低下したことに起因する界面破壊を呈したためである.これより,接着層と母材の界面強度を向上させるために表面処理を施すことは耐久性能を向上させるために重要であることがわかった.

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担当授業科目

  • 工学基礎実験実習 (2023年度) 1・2学期  - 火5~8

  • 工学基礎実験実習 (2023年度) 1・2学期  - 火5~8

  • 機械システム工学演習1 (2023年度) 前期  - その他

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  • 工学基礎実験実習 (2022年度) 1・2学期  - 火5~8

  • 機械システム工学演習1 (2022年度) 前期  - その他

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