Faculty Profiles - TADA Naoya

MISC - TADA Naoya

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702 Study on Biaxial Compressive Forming Limit along Linear Strain Paths of Initially Isotropic Cast AZ31 Magnesium Alloy

HIRANO Seiki, SHIMIZU Ichiro, TADA Naoya, OKADA Kousuke

60 83 - 84 2011

201 Study on Elastic Modulus Evaluation of Ti-Mo Alloy by Means of Indentation Test with Indenters of Various Shapes

KOBATAKE Tetsuya, SHIMIZU Ichiro, TADA Naoya, KIMURA Noriaki, TAKEMOTO Yoshito

60 135 - 136 2011

208 Numerical Simulation of Micro, Meso and Macroscopic Non-Uniform Deformation of Semi-Crystalline Polymer

UCHIDA Makoto, TADA Naoya

60 149 - 150 2011

1709 Effect of Crack Configuration and Electric Conductivity of Solder Ball on Evaluation of Interface Crack between Solder Ball and Copper by DC-PDM

TADA Naoya, NAKAHARA Ryoichi, YOSHIDA Naoto

The Computational Mechanics Conference 2010 ( 23 ) 453 - 454 2010.9

1105 Effect of development of plastic deformation field on stress-strain relation of the semi-crystalline polymer during tensile test

UCHIDA Makoto, TADA Naoya

The Computational Mechanics Conference 2010 ( 23 ) 127 - 128 2010.9

C204 Detection of Stress Corrosion Cracking on the Surface of Stainless Steel Plate by DC-PDM

MAEDA Hiroki, TADA Naoya, UCHIDA Makoto

National Symposium on Power and Energy Systems 2010 ( 15 ) 329 - 332 2010.6

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In order to examine the applicability of the direct-current potential difference method to detection of stress corrosion cracking, the potential difference was measured on the surface of stainless steel plates with simulated cracking. Potential difference was measured near the cracking and at the points distant from the crack to evaluate the degree of increase in the potential difference by the crack. The potential difference near the cracking area was higher than that in the other area. The normalized potential difference, which is the ratio of potential difference near the cracking to that far from the area, was 1.03 to 1.50. The result suggests that stress corrosion cracking was able to be detected by direct-current potential difference method.

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107 Observation of deformation of Au thin film deposited on polycarbonate substrate subjected to compressive loading and unloading

HASHIMOTO Kazuki, TADA Naoya, SHIMIZU Ichiro, SATO Naoyuki

2010 ( 48 ) 13 - 14 2010.2

106 Evaluation of Deformation Behavior of Multilayer Composite Structure

NARUSE Fumio, TADA Naoya

2010 ( 48 ) 11 - 12 2010.2

214 Three-Dimensional Finite Element Analysis of the Effect of Copper Wire Delamination and Voids on Evaluation of Interface Crack between Solder Ball and Copper by Direct Current Potential Difference Method

YOSHIDA Naoto, NAKAHARA Ryoichi, TADA Naoya

2010 ( 48 ) 59 - 60 2010.2

Prediction of Material's Lives under High Temperature Conditions

TADA Naoya

Journal of the Japan Society of Mechanical Engineers 113 ( 1094 ) 8 - 11 2010.1

239 Effect of Microscopic Heterogeneity on Neck Propagation Behavior of Amorphous Polymers

UCHIDA Makoto, TADA Naoya

59 283 - 284 2010

226 Indentation Behavior of Grains of Ti-14Mo Alloy Deformed Mainly by Twin

SHIMIZU Ichiro, KIMURA Noriaki, TADA Naoya, TAKEMOTO Yoshito

59 257 - 258 2010

G0300-9-3 Deformation Behavior and Density Change of Multilayer Composite Structure during Compression

NARUSE Fumio, TADA Naoya

The proceedings of the JSME annual meeting 2010 255 - 256 2010

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

A lot of multilayer ceramic electric devices, for example MLCCs, are manufactured by stacking the ceramic sheets with printed internal electrodes and pressing it to make a monolithic structure. However, the pressing process also causes non-uniform deformation in the ceramic block and it hinders the realization of MLCCs' downsizing. Therefore, the development of highly accurate press technology has been desired. In this study, experimental study on the compression of block of stacked ceramic sheets was carried out and the change in density of side-gap and the local deformation in the block were investigated. It was found that the change in density of side-gap begins to increase at the onset of compression and become constant at the compressive strain of 10%.

DOI： 10.1299/jsmemecjo.2010.1.0_255

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S0304-1-3 Evaluation of Crystal Orientation of Ti-Mo Alloys Using Micro Indentation Test

KIMURA Noriaki, SHIMIZU Ichiro, TADA Naoya, TAKEMOTO Yoshito

The proceedings of the JSME annual meeting 2010 265 - 266 2010

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In recent years, β-type Ti alloys have been attracting much attention for industrial applications, not only by its high specific strength and superior formability but also by special features such as low elastic modulus and extraordinary plastic deformation behavior. However, the studies on β-Ti alloys are still less than those on other types of Ti alloys. Hence, the evaluation processes of various properties of β-Ti alloys have still not been established nevertheless of their importance for industrial applications. The aim of the present study is to evaluate the crystal orientation of grains of β-Ti alloys by means of micro indentation technique. Ti-14Mo and Ti-20Mo alloys, whose primary deformation mechanisms are mechanical twin and coarse slip, respectively, were employed as typical β-Ti alloys. The detailed investigations were performed on the relationship between the crystal orientation and the indentation behavior. The results revealed that the lines which appeared around the indentation of Ti-14Mo almost corresponded to twin boundaries, while those of Ti-20Mo were slip lines. The distortion of indentation shapes also appeared on both Ti-Mo alloys. Based on these results, the procedure of crystal orientation evaluation by micro indentation test was discussed.

DOI： 10.1299/jsmemecjo.2010.1.0_265

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J0301-1-3 Forming Limit of Extruded AZ31 Magnesium Alloy in Biaxial Compressions along Proportional Strain Paths

OKADA Kousuke, SHIMIZU Ichiro, TADA Naoya

The proceedings of the JSME annual meeting 2010 255 - 256 2010

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The deformation twinning of magnesium alloys is known to induce compressive fracture at room temperature. However, the formability in multi-axial compressive stress conditions has scarcely been investigated, nevertheless their importance for plastic working processes such as forging and extrusion. In the present study, biaxial compressive plastic behavior and compressive forming limit of AZ31 magnesium alloy at room temperature were investigated using a unique biaxial compression testing machine. The uniaxial and biaxial compression tests along proportional strain paths were conducted, and thus the influence of strain path upon the mechanical properties and the forming limit were discussed. The compressive forming limit indicated clear strain path dependency. It was also found that the forming limit was influenced by the plastic anisotropy. The adaptability of the typical forming limit criterion to the compressive forming limit was also discussed.

DOI： 10.1299/jsmemecjo.2010.6.0_255

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S0305-3-2 Effect of Carbon Black Fraction on the Fatigue Crack Growth Rate of Vulcanized Natural Rubber Used in Engine Mount Applications

SOMA Prabhakar, TADA Naoya, UCHIDA Makoto, NAKAHARA Kazunari, KATAYAMA Minoru

The proceedings of the JSME annual meeting 2010 141 - 142 2010

Language：English Publisher：The Japan Society of Mechanical Engineers

The effect of carbon black loading on fatigue crack growth rate of vulcanized natural rubber used in automotive applications such as engine mounts was studied using pure shear specimens. Tearing energy was calculated from uncut specimens while crack growth rate was calculated from cyclic tests of cut specimens. Finally the fatigue crack growth rate as a function of tearing energy was determined. The fatigue crack growth rate of natural rubber at a given tearing energy was decreased with the increase in fraction of carbon black.

DOI： 10.1299/jsmemecjo.2010.1.0_141

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G0300-6-2 Finite Element Analysis for Strength Evaluation of Cylinder Block of Gray Cast Iron Taking into Consideration the Distribution of Flaky Graphite

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro, IMAZU Tomoihro

The proceedings of the JSME annual meeting 2010 225 - 226 2010

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The stress distribution in gray cast iron used for diesel engine cylinder block was calculated by the finite element method. The distribution of flaky graphite on the surface of the gray cast iron was observed by microscope and it was reproduced in the analysis model. Three models, (I) multiple graphite model, (II) multiple hole model, and (III) single hole model, were used and the stress distribution near the tip of flaky graphite was discussed. The stress intensity factor for critical flaky graphite was approximately calculated. The results of the present analysis suggested that the stress intensity factor for the critical flaky graphite was found to be about 3.7 times as high as that of a single crack with the same length. Furthermore, critical graphite length to the fracture of cylinder block of diesel engine was calculated based on the proposed method. The length was much larger than that of actual graphite.

DOI： 10.1299/jsmemecjo.2010.1.0_225

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1511 Effect of Copper Wire Location and Voids on Evaluation of Interface Crack between Solder Ball and Copper by Direct Current Potential Difference Method

NAKAHARA Ryoichi, YOSHIDA Naoto, TADA Naoya

The Computational Mechanics Conference 2009 ( 22 ) 724 - 725 2009.10

903 Numerical simulation of mechanical behavior of polycrystalline metals under macroscopic strain gradient

UCHIDA Makoto, SHIMIZU Ichiro, TADA Naoya

The Computational Mechanics Conference 2009 ( 22 ) 330 - 331 2009.10

OS0317 Biaxial Compressive Plastic Behavior of Hexagonal Close-Packed Metals Including Twinning

SHIMIZU Ichiro, TADA Naoya, IDEI Junya

2009 734 - 735 2009.7

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Uniaxial and biaxial compression tests with proportional strain paths were preformed on industrial pure titanium and AZ31 magnesium alloy, in order to investigate the plastic behavior of hexagonal close-packed metals. Those distinctive features were clarified by comparing with the results of industrial pure iron. The true stress-true strain curves of pure titanium and AZ31 alloy showed constant or increasing strain hardening ratio within a certain range of applied strain, due to deformation twinning. The work contours, namely contours of the equal expenditure of plastic work, were obtained by biaxial compressive stress-strain relations for the study of yielding behavior. The deviation of work contour plots in biaxial compression region became large with the progress of plastic deformation. This fact implies the evolution of anisotropy during biaxial compressions of hexagonal close-packed metals.

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