FTMP場の理論に基づく疲労き裂発生過程のマルチスケールシミュレーション

抄録

Modeling fatigue crack initiation process has been one of the long-standing difficult-to-solve problems, since it inevitably involves rational treatments about “transition from deformation to fracture,” i.e., a fatigue crack initiation evolved from a slip band. We tackle this issue by focusing on the critical roles of the PSB ladder structure, i.e., as (a)a carrier of concentrated plastic flow, (b)a generator of vacancies and (c)a provider of the diffusion path of the vacancies. The model is further extended to simulate surface groove formation and the subsequent evolution ultimately into a crack at the edge of the PSB ladder-surface interface.