| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Outline of Final Research Achievements |
The present study established a method to estimate local elastic-plastic properties of rivet joints in terms of indentation tests using two indenters. True stress-strain curves of self-piercing rivet (SPR) and base materials were estimated by the dual indenter method, and pre-strain levels of SPR and base materials were determined by the estimated stress-strain curves. Pre-strained SPR specimens were prepared and conducted fatigue tests, by which local fatigue strength was evaluated. Stress distribution of the SPR specimen and SPR joints were analyzed by finite element method (FEM), and fatigue strengths of SPR itself and SPR joints were correlated.
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