| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
This study proposed a method to evaluate the residual stress and plastic properties using micro-indentation test. This method deals with the materials that obeys the Ludwick work hardening law and involves in-plane equi-biaxial residual stress. Numerical experiment with finite element method (FEM) was carried out in order to simulate indentation test having various plastic strain and residual stress. It was found that indentation force increases with the increasing in plastic strain as well as compressive residual stress. Next, parametric FEM study by changing of residual stress and plastic strain was conducted in order to deduce relationship between indentation curve and materials parameters. This relationship can be expressed by dimensionless function with simple formulae. Thus, the present method can estimate plastic strain (plastic properties) and residual stress for various materials, such as stainless steel, engineering metallic and polymers.
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