Faculty Profiles - SAKAMOTO Junji

Presentations -

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Investigation on Deformation Constraint Near Fiber/Rubber Interface in Cellulose-Nanofiber-Reinforced Natural Rubber by Swelling Test

奥井健斗, 多田直哉, 上森武, 坂本惇司, 増田廉, 榊原圭太

日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2023

Study on Fatigue Damage under Bending Vibration in Aluminum Alloy

坂本惇司, 多田直哉, 上森武

日本材料学会学術講演会講演論文集(CD-ROM) 2023

Surface Height Change at Grain Center and Near Grain Boundaries in Pure Titanium Plate Specimen with Circular Notch under Elastic and Plastic Tensions

緒方隆太, 多田直哉, 上森武, 坂本惇司

日本機械学会M&M材料力学カンファレンス(CD-ROM) 2023

Changes in Crystal Orientation and Surface Height after Unloading in Stepwise Load Increasing Repeated Tensile Test of Pure Titanium Thin Sheet Specimen

大橋弘晃, 多田直哉, 上森武, 坂本惇司

日本機械学会M&M材料力学カンファレンス(CD-ROM) 2023

Effect of Fine Particle Peening on Bending Vibration Life of Titanium Alloy

畑昂輝, 坂本惇司, 多田直哉, 上森武, 杉澤拓海

日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2023

Predictions of active slip system in polycrystalline pure titanium thin film using crystal plasticity finite element analysis

土居雅利, 上森武, 多田直哉, 坂本惇司

日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2023

Microscopic Plastic Deformation and Fracture Processes in Smooth Specimen of Ti-6Al-4V during Tensile Test

丸一紘大, 多田直哉, 上森武, 坂本惇司, 緒方隆太

日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2023

Investigation on the Interface Bonding Strength of Fe-Al Joint Specimens Made by Forging

両保侑希, 多田直哉, 上森武, 坂本惇司, 西本泰己, KARUNATHILAKA Nuwan

日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2023

Change in bending amplitude with crack growth and its effect on crack propagation life in bending vibration of aluminum alloy

小林大悟, 坂本惇司, 多田直哉, 上森武

日本材料学会学術講演会講演論文集(CD-ROM) 2022

Evaluation of Early Fatigue Damage of CFRP Laminates by DC Potential Difference Method

KOMOTO Shohei, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji, NAKAMURA Shunji, SAKURAI Kaori, TAKANASHI Masahiro

The Proceedings of Conference of Chugoku-Shikoku Branch 2022 The Japan Society of Mechanical Engineers

Effect of Titanium Dioxide Particle Content on Tensile Properties of Ultra-High Molecular Weight Polyethylene/Titanium Dioxide Composites

丸一紘大, 多田直哉, 上森武, 坂本惇司, 田中亮至

日本機械学会M&M材料力学カンファレンス(CD-ROM) 2022

二相組織材料に発生する不均一応力が等塑性仕事曲面に与える影響に関する均質化有限要素解析

稲毛駿介, 上森武, 多田直哉, 坂本惇司

塑性加工連合講演会講演論文集(CD-ROM) 2022

Slip Activation Condition for Each Crystal Grain in Thin Sheet of Polycrystalline Pure Titanium under Tension

多田直哉, 上森武, 坂本惇司, 石丸恵太

日本機械学会M&M材料力学カンファレンス(CD-ROM) 2022

Observation of Pull-out and Fracture Behaviour of Fibers in Cracked Specimen of Natural Rubber Reinforced with Cellulose Nanofibers during Tension

SAKAKIBARA Momo, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji, OKUI Kento, SAKAKIBARA Keita

The Proceedings of Conference of Chugoku-Shikoku Branch 2022 The Japan Society of Mechanical Engineers

Changes in Diameter and Nominal Strain of Ti-6Al-4V Alloy Thin Wire under Fatigue Loading

TSUKIHARA Kyoka, SAKAMOTO Junji, TADA Naoya, UEMORI Takeshi, OISHI Koyo

The Proceedings of Conference of Chugoku-Shikoku Branch 2022 The Japan Society of Mechanical Engineers

Evaluation of Joint Strength between Anodized Pure Titanium and High-Density Polyethylene by Tensile Shear Tests

KAYASHIMA Chihiro, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji, MARUICHI Koudai, TANAKA Ryoji

The Proceedings of Conference of Chugoku-Shikoku Branch 2022 The Japan Society of Mechanical Engineers

Study on Tensile Deformation Behavior of Polycrystalline Pure Titanium by Microscopic Residual Strain Measurement

MATSUMOTO Daiki, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji, ISHIMARU Keita

The Proceedings of Conference of Chugoku-Shikoku Branch 2022 The Japan Society of Mechanical Engineers

Relationship between Inhomogeneous Elastic Stress Distribution and Activated Slip System in Thin Sheet Specimen of Pure Titanium during Tension

ISHIMARU Keita, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji, MATSUMOTO Daiki

The Proceedings of Conference of Chugoku-Shikoku Branch 2022 The Japan Society of Mechanical Engineers

Effect of Cyclic Bending Deformation on Tensile Strength of Aluminum Foil

田辺太一, 多田直哉, 上森武, 坂本惇司, 白神修

日本材料学会学術講演会講演論文集(CD-ROM) 2021.5.30

Observation of slip lines of pure titanium thin wire in stepwise tensile test

坂本惇司, 島田侑紀, 多田直哉, 上森武

日本材料学会学術講演会講演論文集(CD-ROM) 2021.5.29

Numerical Investigation on Rolling Texture of Aluminum by Crystal Plasticity Theory

TANABE Takuya, UEMORI Takeshi, TADA Naoya, SAKAMOTO Junji, MITSUI Kousuke, ONODERA Kouki

The Proceedings of Conference of Chugoku-Shikoku Branch 2021 The Japan Society of Mechanical Engineers

Analytical Study on Evaluation of Bauschinger Effect of Aluminum Sheet by L-bending Test

NISHIYAMA Daigo, UEMORI Takeshi, TADA Naoya, SAKAMOTO Junji

The Proceedings of Conference of Chugoku-Shikoku Branch 2021 The Japan Society of Mechanical Engineers

Study on slip deformation behavior of crystal grains in notched thin sheet specimens of pure titanium during tension

ISHIDA Takashi, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji, ISHIMARU Keita

The Proceedings of Conference of Chugoku-Shikoku Branch 2021 The Japan Society of Mechanical Engineers

面内反転時の6056アルミニウム合金の応力-ひずみ応答に関する解析的検討

酒匂麻帆, 上森武, 多田直哉, 坂本惇司

日本金属学会講演大会(Web) 2021

アルミニウム合金の温間二軸引張変形挙動の解析的検討

村尾侑亮, 上森武, 多田直哉, 坂本惇司

日本金属学会講演大会(Web) 2021

リーン型二相ステンレス鋼板の二軸応力状態下における塑性変形挙動の実験的検討

藤田隼輔, 上森武, 多田直哉, 坂本惇司, 石丸詠一朗

塑性加工連合講演会講演論文集 2020.11.14

Crystal plastic homogenization finite element analysis of Ti-6242 alloy subjected to in-plane reverse loading

MITSUI Kousuke, UEMORI Takeshi, TADA Naoya, SAKAMOTO Junji

The Proceedings of Mechanical Engineering Congress, Japan 2020.9.14 The Japan Society of Mechanical Engineers

Event date： 2020.9.13 - 2020.9.16

Language：Japanese Presentation type：Oral presentation (general)

<p>To investigate effects of dislocation density on microscopic stress distribution and macroscopic stress-strain relation, we conducted crystal plastic homogenization finite element analysis of Ti-6242 alloy subjected to in-plane reverse loading with dislocation density calculation. As a result, Statistically Stored (SS) dislocation density increased with occurrence of slip deformation for all conditions. On the other hand, Geometrically Necessary (GN) dislocation density was less likely to accumulate at the interface in the parallel relationship between primary slip systems of hcp and bcc. Although GN dislocations only develop near the interface, a large increase in GN dislocation density affects the macroscopic stress-strain relation.</p>

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Evaluation of Stress Reversal Deformation Behavior of 590 MPa High Tensile Strength Steel Sheet by Using L-Bending Analysis

上森武, 多田直哉, 坂本惇司, 中本浩聖, 西山大悟, 松村宗一郎, 成田忍

日本材料学会学術講演会講演論文集 2020.5

Evaluation of Tensile and Bending Damages of CFRP Laminates by DC Potential Difference Method

SATO Kazuma, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji, KOMOTO Shohei, SUZUKI Natsumi, TAKANASHI Masahiro

The Proceedings of Conference of Chugoku-Shikoku Branch 2020.3 The Japan Society of Mechanical Engineers

Experimental study on strength differential effect of stainless steel sheet

柴井宏治, 上森武, 多田直哉, 坂本惇司

材料とプロセス(CD-ROM) 2020.3

Effect of resin film lamination on tensile deformation characteristics of stainless steel foil

信定宥杜, 多田直哉, 坂本惇司, 上森武

材料とプロセス(CD-ROM) 2020.3

Numerical analysis for inhomogeneous compressive deformation of Multi-Layered Ceramic Capacitor block

TAMAO Seijiro, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji

The Proceedings of Conference of Chugoku-Shikoku Branch 2020.3 The Japan Society of Mechanical Engineers

Surface height change during tensile deformation of natural rubber reinforced with cellulose nanofibers.

榊原桃, 多田直哉, 上森武, 坂本惇司, 石田諭史, 岩本伸一朗

日本機械学会年次大会講演論文集(CD-ROM) 2020

Evaluation of Fatigue Characteristics of Ti-6Al-4V Alloy Thin Wire

築原京香, 坂本惇司, 多田直哉, 上森武, 島田侑紀

日本機械学会年次大会講演論文集(CD-ROM) 2020

Evaluation of Joint Strength between Pure Titanium with Different Surface Properties and High-Density Polyethylene by Tensile Shear Test

萱嶋千紘, 多田直哉, 上森武, 坂本惇司, 西川紘平

日本機械学会年次大会講演論文集(CD-ROM) 2020

Analysis of Relationship between Potential Difference and Fiber Distribution inside CFRP Focusing on the Current Path

河本詳平, 多田直哉, 上森武, 坂本惇司

日本機械学会年次大会講演論文集(CD-ROM) 2020

Study on the Relationship between Surface Roughness, Residual Stress, and Fatigue Life of High Speed Tool Steel with Precision Shot Peening and Polishing

川西志朗, 多田直哉, 上森武, 坂本惇司, KARUNATHILAKA Nuwan

日本機械学会年次大会講演論文集(CD-ROM) 2020

Fatigue strength evaluation of aluminum alloy under multiaxial random vibration

SAKAMOTO Junji, YAMADA Tomoka, TADA Naoya, UEMORI Takeshi, SHIBUTANI Tadahiro

The Proceedings of the Materials and Mechanics Conference 2019.11.4 The Japan Society of Mechanical Engineers

Event date： 2019.11.2 - 2019.11.4

Language：Japanese Presentation type：Oral presentation (general)

<p>Various mechanical components are subjected to random multiaxial vibration. For their safe and effective operation, it is essential to precisely evaluate the fatigue strength of the materials under multiaxial random vibration. However, the mechanisms and evaluation methods remain unclear. In this study, we performed the multiaxial random vibration experiments using aluminum alloy A5056 specimens in order to discuss a method for evaluating the vibration fatigue strength of materials. The multiaxial random vibration experiments were conducted at an acceleration input of 70 G_rms within a frequency band of 10–5000 Hz under a nitrogen gas environment at a room temperature. During the multiaxial random vibration experiments the strains of the specimen were measured using 3-axis and 1-axis strain gauges and the maximum principal strains and their directions of a fracture part were estimated. Based on the results, the method for evaluating the vibration fatigue strength of materials was discussed.</p>

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オーステナイト系ステンレス鋼XM-19の疲労強度と破面解析

坂本惇司, 山本翔太, 澁谷忠弘, 志賀優多, 竹花立美, 佐野尊

構造物の安全性および信頼性(CD-ROM) 2019.10

Study on Defect Detection Method using Surface Height Change due to Low Loading

SAKAMOTO Junji, KUNIYASU Hayato, TADA Naoya, UEMORI Takeshi

The Proceedings of Mechanical Engineering Congress, Japan 2019.9.9 The Japan Society of Mechanical Engineers

Study on Application of Direct-Current Potential Difference Method to Fatigue of Titanium Alloy Thin Wire

TADA Naoya, TAKAGI Yusuke, SHIMADA Yuki, UEMORI Takeshi, SAKAMOTO Junji

The Proceedings of Mechanical Engineering Congress, Japan 2019.9.9 The Japan Society of Mechanical Engineers

Experimental observations of cyclic plastic deformation behaviors of 590MPa class high tensile strength steel sheet and its modeling

UEMORI Takeshi, NAKAMOTO Hiromasa, TADA Naoya, SAKAMOTO Junji

The Proceedings of Mechanical Engineering Congress, Japan 2019.9.9 The Japan Society of Mechanical Engineers

Applying a comprehensive societal risk framework to hydrogen fueling stations

Atsumi Miyake, Junji Sakamoto, Shunichi Hienuki, Jo Nakayama, Yu Ichiro Izato, Kazuhiko Noguchi

Global Congress on Process Safety 2018, GCPS 2018 - Topical Conference at the 2018 AIChE Spring Meeting and 14th Global Congress on Process Safety 2018

Event date： 2018

Language：English

© GCPS 2018.All right reserved. New perspectives on a comprehensive societal risk framework for technological systems are introduced and discussed in relation to an example application involving a hydrogen fueling station for fuel cell vehicles. The comprehensive societal risk framework consists of not only technological and economic risks, but also environmental and societal risks. This framework will be indispensable to risk communication efforts and initiatives to foster the public acceptance of technological systems.

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590MPa級DP鋼の繰返し引張‐圧縮試験とその構成モデル

中本浩聖, 上森武, 多田直哉, 坂本惇司, 早川邦夫

材料とプロセス(CD-ROM) 2019.8.26

引張せん断試験によるアルミニウム合金/高密度ポリエチレンの接合強度評価

多田直哉, 阿部俊太朗, 上森武, 坂本惇司

日本材料学会学術講演会講演論文集 2019.5.24

多軸ランダム振動下のアルミニウム合金の応力場とそれに及ぼすショットピーニングの影響

坂本惇司

日本材料学会学術講演会講演論文集 2019.5.24

多結晶純チタンの引張りにおける結晶方位変化を考慮に入れた微視的すべり変形の評価

佐藤宏樹, 多田直哉, 上森武, 坂本惇司

日本金属学会講演概要(CD-ROM) 2019.3.6

高張力鋼板の面内繰返し応力‐ひずみ応答に与えるひずみ速度の影響

上森武, 多田直哉, 坂本惇司, 中本浩聖, 早川邦夫

材料とプロセス(CD-ROM) 2019.3.1

精密ショットピーニング処理と研磨を施した高速度工具鋼の疲労寿命

花光崚太, KARUNATHILAKA Nuwan, 多田直哉, 上森武, 坂本惇司

日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM) 2019

リスク共生設計の提案:極限環境試験を用いた機器の故障モード特定による機器設計

坂本惇司, 澁谷忠弘, 伊里友一朗, 野口和彦, 中山穣, 三宅淳巳

安全工学シンポジウム講演予稿集 2018.7.3

多軸ランダム振動下のアルミニウム合金の疲労破壊挙動

坂本惇司, 澁谷忠弘

日本材料学会学術講演会講演論文集 2018.5.25

Qualitative evaluation of hydrogen station with HAZID study

KASAI Naoya, NAKAYAMA Jo, SAKAMOTO Junji, SHIBUTANI Tadahiro, MIYAKE Atsumi

The Proceedings of Mechanical Engineering Congress, Japan 2017.9.5

Modeling of a hydrogen fueling station using physical modeling and quantitative estimation of hydrogen release based on accident scenarios

SAKAMOTO Junji, MISONO Hitoshi, NAKAYAMA Jo, KASAI Naoya, SHIBUTANI Tadahiro, MIYAKE Atsumi

The Proceedings of Mechanical Engineering Congress, Japan 2017.9.5

微小傷から発生したき裂の応力場に及ぼす傷形状および微視組織の影響の有限要素解析

坂本惇司, 澁谷忠弘

日本機械学会年次大会講演論文集(CD-ROM) 2016.9.10

水素スタンドにおける継手からの水素漏洩の検討

佐藤龍之介, 中山穣, 坂本惇司, 笠井尚哉, 澁谷忠弘, 三宅淳巳

日本機械学会年次大会講演論文集(CD-ROM) 2016.9.10

多結晶体モデルにおける仮想的なマルテンサイト変態導入の検討

山本翔太, 坂本惇司, 澁谷忠弘

日本機械学会年次大会講演論文集(CD-ROM) 2016.9.10

物理モデリングを用いた水素ステーションにおける緊急時の水素放散法の評価

彌園仁志, 坂本惇司, 中山穣, 笠井尚哉, 澁谷忠弘, 三宅淳巳

日本機械学会年次大会講演論文集(CD-ROM) 2016.9.10

Analysis of Peeling Behavior and Thermal Stress in Adhesion Strength Test of High Temperature Mold Resin

平田諒磨, 澁谷忠弘, 坂本惇司

マイクロエレクトロニクスシンポジウム論文集 2016.9.8

有機ハイドライド型水素ステーションにおける蓄圧器に及ぼすプール火災の影響

中山穣, 彌園仁志, 坂本惇司, 半井豊明, 笠井尚哉, 澁谷忠弘, 三宅淳巳

日本火災学会研究発表会概要集 2016.5.11

液化水素型水素スタンド併設給油取扱所に関するHAZID Studyを用いたSafety Critical Elementsの抽出

中山穣, 坂本惇司, 笠井尚哉, 澁谷忠弘, 三宅淳巳

安全工学研究発表会講演予稿集 2015.12.3

CNGスタンドにおけるディスペンサー周辺の防爆エリアに関する検討

塩田謙人, 中山穣, 坂本惇司, 熊崎美枝子, 笠井尚哉, 澁谷忠弘, 三宅淳巳

安全工学研究発表会講演予稿集 2015.12.3

スズおよびスズ銅合金における結晶異方性に基づく熱応力の有限要素解析

坂本惇司, 大原久和, 澁谷忠弘

日本機械学会M&M材料力学カンファレンス(CD-ROM) 2015.11.20

液化水素型水素スタンド併設給油取扱所におけるガソリン火災時の液化水素貯槽に及ぼす輻射熱の影響

坂本惇司, 中山穣, 半井豊明, 笠井尚哉, 澁谷忠弘, 三宅淳巳

日本機械学会年次大会講演論文集(CD-ROM) 2015.9.12

液化水素型水素スタンド併設給油取扱所におけるHAZID解析とETAを用いた損傷発生確率の検討

佐藤龍之介, 中山穣, 坂本惇司, 笠井尚哉, 澁谷忠弘, 三宅淳巳

日本機械学会年次大会講演論文集(CD-ROM) 2015.9.12

S45C焼入れ焼戻し材を用いた欠陥形状が疲労き裂の停留挙動に及ぼす影響の検討

HAMANO YASUAKI, ZAIZEN KENGO, MATSUEDA TAKAHIRO, SAKAMOTO JUNJI, HAMADA SHIGERU, NOGUCHI HIROSHI

日本機械学会M&M材料力学カンファレンス(CD-ROM) 2013.10.10

Applicability of a FIB-notch as a small initial crack for fatigue limit evaluation

Sakamoto J, Takahashi Y, Noguchi H

19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 2012.1.1

In this study, we propose a method for assessing the applicability of an artificial defect as a small initial crack for fatigue limit evaluation. The proposed method is applied to drill holes and sharp notches introduced using a focused ion beam (FIB) technique in annealed 0.45% carbon steel. It is found that under rotating bending fatigue, an FIB notch can be used as a small initial crack for fatigue limit evaluation, whereas a drill hole cannot, for of ∼50 μm. Here, is the square root of the area obtained by projecting the defect onto a plane perpendicular to the load axial direction. The results indicate that an FIB notch can be used as a small initial crack for fatigue limit evaluation in a greater number of materials than those in which a drill hole can be used.

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Other Link： http://orcid.org/0000-0002-2108-2258

FIB加工による人工欠陥を有するS45C焼鈍し材の微小疲労き裂進展挙動

坂本惇司, 高橋可昌, 野口博司

日本機械学会M&M材料力学カンファレンス(CD-ROM) 2011

Effect of gaseous hydrogen on cyclic slip behavior around a stage i fatigue crack tip in an iron alloy

Takahashi Y, Sakamoto J, Tanaka M, Higashida K, Noguchi H

18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale 2010.12.1

In order to investigate the effect of gaseous hydrogen on cyclic slip behavior around an early stage (stage Ifatigue crack tip, fatigue crack growth (FCGtests using a single-crystalline Fe-3.2wt.%Si alloy are conducted respectively in a hydrogen atmosphere and in a helium atmosphere. The cross-sectional observations of the crack tips by both electron backscatter diffraction (EBSDmethod and transmission electron microscopy (TEMsuccessfully reveal the following points. In helium atmosphere, FCG is preceded by formation of cell structures and crack propagates along cell boundaries. In hydrogen atmosphere, on the other hand, no cells are seen, and crack growth process is similar to that observed in a stage II type FCG. Crack extension resistance in hydrogen is postulated to be lower than that in helium, indicating that the mode of FCG in hydrogen is more critical than that in helium.

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Other Link： http://orcid.org/0000-0002-2108-2258

透過型電子顕微鏡による傾斜疲労き裂先端の微視的すべり挙動におよぼす水素の影響解析

坂本惇司, 高橋可昌, 田中將己, 東田賢二, 野口博司

日本材料学会学術講演会講演論文集 2010.5.21

Optimization of Shape of Stress-relief Groove for Improvement of Fretting Fatigue Strength

SAKAMOTO JUNJI, KONDO YOSHIYUKI, KUBOTA MASANOBU

日本機械学会年次大会講演論文集 2009.9.12

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