Faculty Profiles - TADA Naoya

3326 Mechanical Behavior of Industrial Pure Titanium during Biaxial Compressive Plastic Deformation with Strain Path Change

SHIMIZU Ichiro, TADA Naoya, SHIBUTANI Kyosuke

The proceedings of the JSME annual meeting 2006 481 - 482 2006

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The understanding of the multiaxial flow behavior of polycrystalline metals is important not only for the process planning but also for the quality assurance of metal working products. In the present study, the biaxial compression experiments with strain path change were performed on industrial pure titanium using a newly developed testing apparatus. The influences of strain path and abrupt path change upon the mechanical behavior were then investigated. The results show that both the strain level at path change and the directional relation between the sequential paths affect the stress-strain relation of the material. It is also found that the plastic anisotropy has influences on the mechanical behavior with regard to the strain histories.

DOI： 10.1299/jsmemecjo.2006.1.0_481

506 Study on Deformation Behavior of Polycrystalline Metal during Biaxial Plastic Compression

SHIMIZU Ichiro, TADA Naoya

The Computational Mechanics Conference 2005 ( 18 ) 827 - 828 2005.11

715 Microscopic Deformation Behavior of Polycrystalline Metal during Tensile Plastic Deformation

WANG Xiaoqun, ABE Takeji, TADA Naoya, TORII Tashiyuki

2005 ( 80 ) "7 - 29"-"7-30" 2005.3

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

It is well-known that the hardness of material is related to its mechanical characteristics. The microscopic inhomogeneity of polycrystalline pure titanium is evaluated by testing the micro hardness of the grain for various grain orientation. Namely, the change in the hardness associated with plastic deformation, and the relation between the deformation of grain and the change of the hardness are studied, by measuring hardness before and after tensile deformation. The strains of respective grains are also measured and the effect of grain size is discussed.

Microscopic Surface Change of Polycrystalline Aluminum duringTensile Plastic Deformation

119 The Effect of Pre-Compression on Mechanical Behavior of Industrial Pure Titanium in Uniaxial and Plane Strain Compressions

SHIBUTANI Kyosuke, SHIMIZU Ichiro, TADA Naoya

2005 ( 43 ) 37 - 38 2005.2

Wang Xiaoqun, Abe Takeji, Tada Naoya, Shimizu Ichiro

Memoirs of the Faculty of Engineering, Okayama University 39 ( 1 ) 7 - 15 2005

ひずみ経路可変型二軸圧縮試験機を用いたアルミニウムの交差効果に関する検討 (日本実験力学会講演論文集 2005年度年次講演会) -- (実験力学分野全般(2))

清水一郎, 多田直哉

日本実験力学会講演論文集 ( 5 ) 64 - 66 2005

1755 Relationship between Shape of Indentation by Nanomdenter and Crystal Orientation on Surfaces of Pure Titanium Grains

Shimizu Ichiro, Tada Naoya, Inoue Takatoshi, Wang Xiaoqun, Hosoi Yasunari

The proceedings of the JSME annual meeting 2005 413 - 414 2005

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The nanoindentation test has been recently developing to evaluate local mechanical properties in micro areas of various materials. In the present study, the nanoindentation tests were performed to grains in polycrystalline pure titanium, which is hexagonal close-packed crystal structure thus has less slip systems than the other crystalline structures. Then the relationship between the crystal orientation and the resultant indentation shape was investigated. The experimental results show the clear orientation dependence of the indentation shape. The obtained hardness value tends to increase when <0001> direction approaches to the direction normal to the sample surface.

DOI： 10.1299/jsmemecjo.2005.1.0_413