| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Effects of Surface Roughness on Microstructure-sensitive Computations of Fatigue Crack Formation Driving Force in Duplex Ti-6Al-4V and Al 7075-T6 |
| Author(s) |
Krzysztof S. Stopka, David L. McDowell |
| On-Site Speaker (Planned) |
Krzysztof S. Stopka |
| Abstract Scope |
Ensembles of duplex Ti-6Al-4V and Al 7075-T6 statistical volume elements (SVEs) undergo Crystal Plasticity Finite Element Method (CPFEM) simulations to examine the effects of a rough surface on the fatigue crack formation driving force. Surface roughness effects are incorporated into the CPFEM simulations by artificial slip intensification at surface grains, which decays toward the interior of the SVE. After elastic-plastic shakedown, mesoscale volume-averaged Fatigue Indicator Parameters (FIPs) are calculated within fatigue damage process zones of grains and fit to known Extreme Value Distributions (EVDs). SVE ensembles vary in crystallographic orientation distribution and grain shape. The surface proximity and elastic strain of the highest FIPs are examined, and multiaxial strain states are considered. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |