| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Early stage fatigue crack propagation in Ni-base superalloys was experimentally and analytically investigated. Fatigue crack propagation tests were conducted for a single crystal and a directional solidified superalloy, and clarify effects of crystal orientation, grain boundary and testing temperature on crack propagation behavior. An elastic-plastic and crystal plasticity analysis were carried our based on a finite element model considering realistic crack geometry. It was concluded that trans-granular fatigue crack propagation was rationalized by fracture mechanics parameter that considered slip activities in slip systems in Ni-base superalloys.
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