| About this Abstract |
| Meeting |
2017 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
|
| Presentation Title |
Physically-based Simulation of Surface Microcrack Initiation and Comparison with Experimental Data |
| Author(s) |
Maxime Sauzay, Jia Liu, Jérôme Hazan, Liang Huang |
| On-Site Speaker (Planned) |
Liang Huang |
| Abstract Scope |
The proposed crystal plasticity FE modelling accounts for the main mechanisms occurring in ductile metals and alloys: - localized plastic slip in persistent slip bands (PSBs) (Sauzay and Kubin, 2011); - production and annihilation of vacancies induced by cyclic slip. If temperature is high enough, point defects diffuse in the surrounding matrix due to large concentration gradients, allowing continuous extrusion growth (Polak and Sauzay, 2009); - brittle fracture at PSB interfaces and along grain boundaries which is simulated using cohesive zone modelling. The parameters are adjusted using only on experimental single crystal hysteresis loops and GB/surface energies which are environment dependent. The predicted extrusion growth curves agree well with the experimental data published for copper and 316L steel. The predicted linear dependence with respect to grain size, PSB thickness and PSB orientation agrees with AFM measurement results. Crack initiation simulations predict fairly well the effects of grain size and environment. |
| Proceedings Inclusion? |
Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below) |