| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
A Direct Physical Approach to Characterize Fatigue Crack Growth Under Large Scale Plasticity in Stress- and Strain-Controlled Fatigue |
| Author(s) |
K. S. Ravi Chandran |
| On-Site Speaker (Planned) |
K. S. Ravi Chandran |
| Abstract Scope |
The major challenge in the mechanics of elastic-plastic fatigue crack growth (FCG) is achieving a single-valued correlation of fatigue rack growth rates in stress-controlled and strain-controlled testing conditions. Approaches of the past used either the cyclic strain range or the nonlinear fracture mechanics (∆J) parameter. These approaches are either numerical in calculation or difficult to implement in experiments. In the present work, we show that a new physically based approach, based on the change in the cyclic strain energy of the net-section, can successfully correlate FCG in various elastic-plastic loading situations. The change in the cyclic strain energy is determined analytically from tensile elastic-plastic behavior of material and directly from the relative sizes of cracked and uncracked sections of specimens. Remarkably, excellent correlations of fatigue crack growth data in a variety of specimen geometries, and under varied cyclic stress/strain levels, have been found for both stress- and strain-controlled fatigue. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Temperature Materials, Modeling and Simulation |