| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
A Simplified Formula to Estimate the Size of the Cyclic Plastic Zone in Metals Containing Elastic Particles |
| Author(s) |
Tito Andriollo, Varvara Kouznetsova |
| On-Site Speaker (Planned) |
Tito Andriollo |
| Abstract Scope |
The applicability of the well-known Irwin’s estimate to metals containing particles becomes dubious when the plastic zone (PZ) size is comparable to the particle spacing. To shed light on this, a multiscale finite element model is used to investigate the crack tip plasticity in a cyclically loaded elastic-perfectly plastic matrix containing a distribution of spherical particles generated using X-ray tomography. Homogenization and dimensional analysis demonstrate that the PZ shape differs from what expected based on von Mises plasticity. The scaling of the PZ size with the maximum stress intensity factor squared is confirmed, but the proportionality factor is strongly affected by the particle volume fraction. Consequently, a new formula to estimate the PZ size is proposed, which holds for a wide range of material properties, spanning from metal matrix composites to cast irons, and is robust to minor particle deviations from the spherical shape. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Modeling and Simulation, |