Faculty Profiles - TADA Naoya

Papers - TADA Naoya

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Microscopic Height Change on the Surface of Polycrystalline Pure Titanium Plate Under Cyclic Tension Reviewed

Naoya Tada

INTERNATIONAL DIGITAL IMAGING CORRELATION SOCIETY 267 - 271 2017

Cracking behavior of thin gold strip deposited on polycarbonate plate under Cyclic and stepwisely-increased tension Reviewed

Naoya Tada, Yafei Hu, Takeshi Uemori, Toshiya Nakata

2017 INTERNATIONAL CONFERENCE ON MECHANICAL, AERONAUTICAL AND AUTOMOTIVE ENGINEERING (ICMAA 2017) 108 01004 2017

Evaluation of bonding strength of thin copper wire and lead-free solder by pullout tests Reviewed

Naoya Tada, Takuhiro Tanaka, Hirotsugu Tabata, Takeshi Uemori, Toshiya Nakata

Proceedings of Technical Papers - International Microsystems, Packaging, Assembly, and Circuits Technology Conference, IMPACT 164 - 167 2016.12

Elastic and plastic microscopic deformation of polycrystalline pure titanium under tension Reviewed

Naoya Tada, Yuki Doi

American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP 3 PVP2016-63268 2016

Microscopic deformation of polycrystalline pure copper wire during tension Reviewed

Naoya Tada, Yoshitaka Matsukawa, Takeshi Uemori, Toshiya Nakata

2015 10th International Microsystems, Packaging, Assembly and Circuits Technology Conference, IMPACT 2015 - Proceedings 229 - 232 2015.12

Computational simulation of micro- to macroscopic deformation behavior of cavitated rubber blended amorphous polymer using second-order homogenization method Reviewed

Makoto Uchida, Naoya Tada

Key Engineering Materials 626 74 - 80 2015

FINITE ELEMENT ANALYSIS FOR THE EVALUATION OF CRACKS AT A PIPE-FLANGE WELDED PART BY THE DIRECT-CURRENT POTENTIAL DIFFERENCE METHOD Reviewed

Naoya Tada, Masaki Kosaka

PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE - 2015, VOL 5 PVP2015-45484 2015

Surface Undulation of Pure Titanium Grains under Elastic and Plastic Tensile Conditions Reviewed

Naoya Tada

Extended Abstracts of 10th International Conference on Advances in Experimental Mechanics 2015

Deformation of vehicle body in pole side impact and its experimental modeling by means of rectangular steel tube

ONO Tadanori, SHIMIZU Ichiro, TADA Naoya, TAKUBO Nobuaki

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 81 ( 826 ) 14 - 00542-14-00542 2015

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Pole side impact is one of the most common types of vehicle collisions. The pole side impact at high vehicle speed induces not only local collapse but also bending of the vehicle body. However, the estimation method of the vehicle speed with consideration of the bending has not been established yet. In the present study, the deformation of the vehicle body at the pole side impact experiment with impact speed of 80 km/h was investigated. The results revealed that the collapse deformation first occurred and then the bending deformation followed. In order to understand the deformation of the vehicle at high-speed pole side impact, lateral local compression test and three-point bending test of rectangular steel tubes were performed. It was found that the deformation of the tube was similar to that of the vehicle at the pole side impact experiment, when the specimen was subjected to the sequential test of lateral local compression and three-point bending. The change in the energy absorbed by the deformation of tube in the sequential test was also found to be similar to that in the vehicle experiment. These similarities are useful to investigate the vehicle collision speed at high-speed pole side impact based on the deformation and the absorbed energy of rectangular metal tubes.

DOI： 10.1299/transjsme.14-00542

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POTENTIAL DIFFERENCE DISTRIBUTION ON FLAT PLATE AROUND SEMI-ELLIPSOIDAL THINNING ON THE BACK SURFACE

Naoya Tada, Makoto Uchida, Manabu Nohara

ASME PRESSURE VESSELS AND PIPING CONFERENCE - 2014, VOL 5 PVP2014-28684 2014

Evaluation of Tensile Strength of Copper-Cored Lead-Free Solder Joints in Air, Distilled Water, and NaCl Solution Using Testing Device with Permanent Magnets

Naoya Tada, Hiroyasu Masago

IMPACT-EMAP 2014 Proceedings 237 - 240 2014

NON-DESTRUCTIVE DETECTION OF CRACK IN HDPE PLATE BY NANOMETRIC CHANGE IN SURFACE PROFILE

Naoya Tada, Makoto Uchida, Yoshitaka Matsukawa

PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE - 2013, VOL 5 PVP2013-97732 2014

Micro-, meso- to macroscopic modeling of deformation behavior of semi-crystalline polymer Reviewed

Makoto Uchida, Naoya Tada

INTERNATIONAL JOURNAL OF PLASTICITY 49 164 - 184 2013.10

Remotely-Controlled Tensile Test of Copper-Cored Lead-Free Solder Joint in Liquid Using Permanent Magnet

Naoya Tada, Hiroyasu Masago

IMPACT-IAAC 2013 Proceedings 372 - 375 2013

Investigation of Deformation Mechanism under Indentation Testing of Metastable Beta-type Reviewed

Ichiro SHIMIZU, Noriaki KIMURA, Naoya TADA, Yoshito TAKEMOTO

Proceedings of the 8th International Symposium on Advanced Science and Technology in Experimental Mechanics ( 62 ) 2013

Deformation Behavior of Multi-Layered Ceramic Capacitors Block under Non-Frame Press

NARUSE Fumio, TADA Naoya

Transactions of the Japan Society of Mechanical Engineers Series B 79 ( 800 ) 442 - 454 2013

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

To investigate the deformation behavior of multi-layered ceramic capacitors (MLCCs) during production press process is very important to reduce over all MLCC size and increase the capacity of the MLCC through the enlargement of the electrode area. In the previous paper, the deformation of MLCC blocks in the uniaxial compression test was observed and the filling mechanism was clarified based on the measurement results. In this study, the non-frame press tests of MLCC blocks were carried out to realize the high precision press, in which the lateral compressive stress was given in addition to the longitudinal one. The deformation process was clarified based on the results of cross-sectional observation. In the edge part of the MLCC block, the interlayer space in Side-Gaps L and W was decreased by longitudinal strain and the lateral strain, whereas, at the central part of the MLCC block, the interlayer space in Side-Gaps L and W was decreased only by longitudinal strain. Since the difference in the deformation behavior between the central part and the edge part generated variations in the thickness of MLCC block, the width of the internal electrode part and the width of the Side-Gap, it was concluded that non-frame press was not suitable for high precision press of MLCC block.

DOI： 10.1299/kikaia.79.442

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Establishment of Deformation Simulation Procedure by Finite Element Method Based on Second-Order Homogenization Using Characteristic Displacement Function for Macroscopic Strain Gradient

UCHIDA Makoto, TADA Naoya

Transactions of the Japan Society of Mechanical Engineers Series B 79 ( 806 ) 1486 - 1503 2013

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

To evaluate effect of a relative scale of microstructure to macrostructure, a simulation procedure using second-order homogenization based finite element method was proposed. In this method, a microscopic characteristic displacement function for macroscopic strain gradient was added to the conventional first order homogenization method. Then, a procedure to solve a macroscopic boundary problem was established based on the principle of virtual work in macroscopic scale represented by the microscopic characteristic displacement function. To validate the proposed second-order homogenization method, computational simulations of deformation behavior of cavitated rubber (void) blended amorphous polymer were performed using the proposed second-order homogenization. From the result of bending deformation where tension or compression was given to upper side or lower side of the macroscopic model, the material containing larger void required a larger energy for the bending of the model. With decrease in the void size, the energy converged to that predicted by first-order homogenization method. Basically, the deformation behavior predicted by proposed homogenization model was qualitatively and quantitatively similar to that predicted by full scale model. The proposed model is expected to be applied for computational prediction of the scale-dependent deformation in various cases because the model does not limit the form of constitutive equation, shape of the unit cell and deformation mechanisms and structure of the material.

DOI： 10.1299/kikaia.79.1486

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Microscopic Evaluation of Plastic Deformation during Back-and-Forth Bending of Polycrystalline Pure Titanium Specimen with a Pair of Parallel Grooves Using Arranged Marks at Lattice Points

TADA Naoya, SHIMIZU Ichiro

Transactions of the Japan Society of Mechanical Engineers Series B 79 ( 800 ) 420 - 432 2013

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

A single-cycle bending test of polycrystalline pure titanium was carried out using a rectangular specimen with a pair of parallel grooves. The plastic deformation in a long part between these grooves was observed at every quarter cycle of back-and-forth bending. Before the test, multiple square marks of gold were made at the lattice points having a mutual distance of 12.5 μm in the region of interest by ion-coater. The strain and rotation during the test were evaluated based on the displacement of these gold marks. The following results were obtained: (1) The region of interest between grooves showed plastic deformation during bending, and the deformation was mainly caused by slips. Twining was also observed in some grains. (2) The strain and rotation during the bending were not uniform grains to grains. The shearing strain was small compared with the normal strains and rotation. (3) The region, which showed a larger normal strain at the first quarter cycle, continued to show a relatively large strain at the following quarter cycles in an opposite direction. Rotation showed a similar behavior. (4) Crystal orientation analysis was performed for grains with clear slip lines. The plastic deformation of these grains seemed to occur mainly by the prismatic slip.

DOI： 10.1299/kikaia.79.420

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Evaluation of Strength of Diesel Engine Cylinder Block by Finite Element Analysis Based on Microstructure of Gray Cast Iron

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro

Transactions of the Japan Society of Mechanical Engineers Series B 79 ( 799 ) 281 - 293 2013

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Stress distribution of gray cast iron was analyzed by the finite element analysis based on the actual distribution of graphite flakes embedded in pearlite. Three types of two-dimensional FE-models were used: (1) "true model" where graphite flakes were distributed in pearlite as observed, (2) "voids model" where graphite flakes were replaced by voids of the same geometries, and (3) "single void model" where one of selected voids which showed higher stress in the vicinity of void tip in the pearlite. As the voids model showed higher stress in the vicinity of each void tip, it was concluded that the voids model was appropriate for the safe-side evaluation of gray cast iron strength. Furthermore, a simplified method of strength evaluation was proposed by comparing the results of the voids model with those of the single void model. Since the maximum ratio of the stress near the void tip was 6.27 between the voids model and the single void model, tensile and fatigue strengths of gray cast iron was evaluated by the stress intensity factor multiplied by 6.27 using the maximum length of graphite flakes, the threshold stress intensity factor range and fracture toughness of pearlite about the tested diesel engine cylinder block. The method validated the safety of cylinder block of the tested diesel engine.

DOI： 10.1299/kikaia.79.281

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Study on Deformation of Rectangular Metal Tube during Dynamic Three-Point Bending for Modeling of Pole Side Impact of Vehicle

Tadanori Ono, Ichiro Shimizu, Naoya Tada, Nobuaki Takubo

Proceedings of Joint International Conference of the 2nd International Symposium on Experimental Mechanics, The 11th Asian Conference on Experimental Mechanics and 2012 Society for Experimental Mechanics Fall Conference, 7th International Symposium on ・・・ No.A122 2012

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