Faculty Profiles - TADA Naoya

MISC - TADA Naoya

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G031015 Study on Compressive Forming Limit of Cast AZ31 Magnesium Alloy by Biaxial Compressions with Proportional and Non-proportional Strain Paths

AKIYAMA Daisuke, SHIMIZU Ichiro, TADA Naoya

Mechanical Engineering Congress, Japan 2013 "G031015 - 1"-"G031015-3" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Magnesium alloys have special features such as light weight, high specific strength, and good reusability. However, information on the compressive formability of magnesium alloys in multi-axial compressive stress conditions is still limited, nevertheless of their importance in plastic working processes such as forging and extrusion. In the present study, biaxial compression tests of initially isotropic cast AZ31 magnesium alloy were performed along proportional and non-proportional strain paths at room temperature. In the tests, the change of microstructure was observed using a scanning electron microscope. The results revealed that the compressive forming limit of AZ31 magnesium alloy was affected not only by the maximum shear stress but also by the hydrostatic stress. The area fraction of twin, which influences on the compressive flow behavior, was found to vary according to the strain paths.

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207 Deformation Analysis of Gold Thin Film on Polycarbonate Substrate Subjected to Thermal Change and Tensile Load by Finite Element Method

GERILI Sibuda, TADA Naoya, SHIMIZU Ichiro, HU Yafei

2013 ( 51 ) "207 - 1"-"207-2" 2013.2

208 Absorbed Energy Evaluation during Lateral Local Compression and Three-Point Bending of Rectangular Steel Tube by Plastic Hinge Theory

KOHARA Masato, ONO Tadanori, SHIMIZU Ichiro, TADA Naoya

2013 ( 51 ) "208 - 1"-"208-2" 2013.2

A Fundamental Study on Plastic Deformation of Metastable Beta-Type Ti-Nb Alloys under Uniaxial and Biaxial Compressions

Ichiro Shimizu, Kazuaki Hisada, Naoya TADA, Yoshito TAKEMOTO

Abstract Book of the International Conference on Experimental Mechanics 2013 & the 12th Asian Conference on Experimental Mechanics 48 - 48 2013

Motivation for Scientific Research Reviewed

TADA Naoya

Journal of the Japan Society for Testing Materials 62 ( 7 ) 472 - 472 2013

924 Study on the periodic boundary condition under macroscopic strain gradient

UCHEDA Makoto, TADA Naoya

The Computational Mechanics Conference 2012 ( 25 ) 378 - 379 2012.10

OS0302 Plastic Deformation and Forming Limit of Initially Isotropic Cast AZ31 Magnesium Alloy under Biaxial Compressions at Elevated Temperatures

HIRANO Seiki, SHIMIZU Ichiro, AKIYAMA Daisuke, TADA Naoya

2012 "OS0302 - 1"-"OS0302-2" 2012.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Magnesium alloys have special features such as light weight, high specific strength and good reusability. However, information on the flow behavior and formability of magnesium alloys in multi-axial compressive stress conditions is highly limited, nevertheless of their importance for plastic working processes such as forging and extrusion. In the present study, the uniaxial and biaxial compression tests along proportional strain paths were conducted at room and at elevated temperatures, and thus the influence of strain paths and temperature upon mechanical properties and compressive forming limit were discussed. The results revealed that the flow stress scarcely changes with the test temperature in the range from 493 K to 523 K. On the other hand, the compressive forming limit was found to be dependent on the temperature as well as the strain paths.

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J041025 Basic Study on Crystal Orientation Dependency of Uniaxial Compressive Deformation of Micropillar Fabricated in Grain of Pure Titanium

SHIMIZU Ichiro, OKANO Shoutaro, TADA Naoya

Mechanical Engineering Congress, Japan 2012 "J041025 - 1"-"J041025-3" 2012.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Titanium is one of materials with hexagonal close-packed structure, in which mechanical twinning often occurs and the plastic behavior becomes rather complicated. In recent years, the compression testing technique of a micropillar fablicated in a grain of metallic material has been developed for the purpose to study the deformation properties of a single crystal structure in a polycrystalline aggregate. In the present study, micropillars with rectangular cross section were fablicated in grains of industrial pure titanium by Focused Ion Beam (FIB) technique. The micro-compression tests were then performed in order to investigate the compressive behavior of single crystal micropillars. It was found that the load-displacement relations obtained by compression tests varied according to the crystal orientation and dimensions of the micropillars. Several traces of mechanical twinning were found to appear on the side surfaces of micropillars after the compression test, when the compressive force was applied in <0001> direction of the titanium grains.

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Non-Destructive Evaluation of Damage at Small Joint Interface Using Direct-Current Potential Difference Method

61 ( 9 ) 452 - 457 2012.9