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Numerical process simulation of hot forming

Keikinzoku/Journal of Japan Institute of Light Metals 2021年第3期71卷 152-157页

作者： YOSHIDA, Yoshinori Center for Advanced and Smart Die Engineering and Technology G-CADET Gifu University Tokai National Higher Education and Research System 1-1 Yanagido Gifu-shi Gifu501-1193 Japan

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Influence of Surface Asperity Made by Selective Laser Melting Additive Manufacturing on Bioactivity in Rat Femur

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Procedia Manufacturing 2020年 47卷 1101-1105页

作者： Asuka Kutsukake Yoshinori Yoshida Center for Advanced and Smart Die Engineering Technology (G-CADET) Gifu University 1-1 Yanagido Gifu 501-1193 Japan

Bioactivity of the surface of the Ti-6Al-4V implant model manufactured by additive manufacturing with selective laser melting is investigated. The shape of the implant model is quadratic beam and a model has three types of surface; (a) top surface, (b) side surface and (c) polished surface. Each asperity of the surfaces is different respectively and an implant model into each femur of 5-week-old IgS rats. 2 weeks after the implantation, the influence of the asperity on the bioactivity is evaluated by bone-implant contact area ratio ( R B-I ). The R B-I is evaluated on each surface which is contact with cortical bone and bone marrow, respectively. As the results, it is found that osteoinductivity appears on the surface created with AM in diaphysis of the femur in short term after the implantation. The R B-I of the surfaces is almost same, when they contact with bone marrow. When the surfaces contact with cortical bone, the bioactivity of side surface is larger than that of top surface.

关键词： Selective laser melting Biomaterial Bioactivity

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Evaluation of neck shape of notched round-bar specimens during tensile test

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Procedia Manufacturing 2018年 15卷 1762-1768页

作者： Takeshi Nishiwaki Masanobu Murata Yoshinori Yoshida Dept. of Mechanical Engineering Daido University Nagoya Aichi 457-8530 Japan Dept. of Production and Systems Nagoya Municipal Industrial Research Institute Nagoya Aichi 456-0058 Japan Center for Advanced Die Engineering and Technology (G-CADET) Gifu University Gifu-City Gifu 501-1193 Japan

Notched round-bar tensile tests were conducted on three types of metals, and their flow stress curves were identified. Deformation of the specimens was recorded using two CCD cameras and the changes in their cross-sectional radius were measured using a digital image correlation method. The average tensile stress was corrected through an inverse analysis, and the numerical results coincided with the experimental results. Measurements of the longitudinal profiles of a necked specimen were also carried out. Numerical analysis results using the identified flow stress curve showed a good agreement with the experimental results.

关键词： Tensile test Notched specimen Flow stress Local necking Degital image correlation

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Identification of Ductile Fracture Parameter with Stress Correction Method Using Notched Round-Bar Tensile Test

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Procedia engineering 2017年 207卷 2060-2065页

作者： Masanobu Murata Yoshinori Yoshida Takeshi Nishiwaki Dept. of Production and Systems Nagoya Municipal Industrial Research Institute Nagoya Aichi 456-0058 Japan Center for Advanced Die Engineering and Technology (G-CADET) Gifu University Gifu-City Gifu 501-1193 Japan Dept. of Mechanical Engineering Daido University Nagoya Aichi 457-8530 Japan

A stress correction method is proposed for the identification of flow stress with the circumference notched round bar tensile test. Flow stress is evaluated post necking until final fracture in the tensile test. Tensile load and change in the shape of the notch are measured by image analysis. In order to correct average tensile stress to the flow stress, inverse analysis is applied to the tensile test results. The proposal stress correction method is applied to two metallic materials; a low carbon steel and an aluminum alloy. In each material, corrected flow stress curves overlapped into a single curve regardless of the initial notch radius. Furthermore, the critical damage values of two kinds of ductile fracture criterion are identified.

关键词： tensile test notched specimen flow stress ductile fracture stress triaxiality

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Influence of heat treatment on mechanical property of steel hollow sphere and its sheet construction

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AIP Conference Proceedings 2017年第1期1896卷

作者： Yoshinori Yoshida Sho Ozawa 1Center for Advanced Die Engineering and Technology (G-CADET) Gifu University 1-1 Yanagi-do Gifu 501-1193 Japan

Heat treatments, water quenching and annealing, are performed on the metallic hollow spheres (MHS) made from steel with 4.0 mm in outer diameter. They are pierced then put on a piece of tungsten alloy wire for making a MHS thread. The thread is set in between two neighboring warps of the tungsten alloy and the thread is placed in a reticular pattern. The MHS fabric sheet which has plain weave structure is produced by the weaving process. Furthermore, a sandwich construction of the sheet with 2 sheets of aluminum plate. The influence of the heat treatments on difference of mechanical and energy absorption property are evaluated by mean of compression test for the sheet along with the thickness direction. In addition, an aluminum pipe is filled with a heat treated MHS sheet and compression test is performed for the pipe along the radial direction. Its difference of compression load and energy consumption property is investigated.

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Elastic clearance change in axisymmetric shearing process

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AIP Conference Proceedings 2016年第1期1769卷

作者： Yoshinori Yoshida 1Center for Advanced Die Engineering and Technology (G-CADET) Gifu University (1-1 Yanagi-do Gifu 501-1193 Japan)

An axisymmetric shearing experiment is conducted for a sheet of low carbon steel and stainless steel. Elastic change in the clearance between punch and die is measured. The increase of the clearance in shearing is confirmed and the influence of sheared material’s flow stress on the clearance change is shown. Finite element analysis (FEA) of shearing with gurson-Tvergaard-Needlman model (gTN model) is conducted for shearing of the carbon steels with rigid tools as a numerical experiment. Burr height is predicted in the FEA and the result is compared with the experimental result. In addition, the influence of the clearance on stress state in the material is investigated.

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