| Budget Amount *help |
¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
Fiscal Year 2015: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2014: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2013: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
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| Outline of Final Research Achievements |
It revealed the fatigue strength and fatigue damage mechanism of each bonding material, such as resistance spot welded joints, remote laser welding joints and the friction stir spot joint. And also, the fatigue life prediction method under variable amplitude loading was examined. The fatigue crack initiated at the slit between upper and lower plates in any of the joints. It was clear that the fatigue life was evaluated by stress intensity factor range which is a mechanical parameter governing the singular stress field at the slip tip. The fatigue life evaluation method under variable amplitude loading, was clear that the prediction method of modified Miner’s law or Corten-Dolan method is reasonable.
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