| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
|
|---|
| Research Abstract |
This study attempted modeling and simulation of a transient process from a slip band to a fatigue crack based on Field Theory of Multiscale Plasticity(FTMP), focusing on the dislocation substructures evolving during cyclic straining. A persistent slip band(PSB) with ladder-like structure was demonstrated to be successfully reproduced via FTMP-based incompatibility model introduced in a crystal plasticity-based FE simulation. After identifying the substantial role of the PSB ladder wall structure in the vacancy flow there, a preliminary simulation for the transition process was conducted, where the incompatibility model for the vacancy field was additionally introduced. There observed surface groove formation and its growth on the sample surface near the edge of PSB, implying its further evolution into a crack under successive straining cycles.
|
