2011 Fiscal Year Final Research Report
Field Theory-based Multiscale Modeling for Fatigue Crack Initiation process
| Project/Area Number |
21560092
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kobe University |
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Principal Investigator |
HASEBE Tadashi 神戸大学, 大学院・工学研究科, 准教授 (20237994)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 場の理論 / マルチスケール / 疲労き裂 / 結晶塑性 / 転位論 |
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| 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.
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