About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Fracture Mechanics Based Approach for Fatigue Assessment of Ultra-High Strength Steels |
Author(s) |
Thomas Straub, Igor Varfolomeev, Andreas Kleemann, Michael Luke |
On-Site Speaker (Planned) |
Thomas Straub |
Abstract Scope |
This work focuses on fatigue life assessment of ultra-high strength steels (UHSS) considering the stages of crack initiation from microstructural defects and micro crack propagation until fracture. In view of high stress levels achieved in components made of UHSS and small crack sizes tolerable in such materials, particular attention is given to the experimental determination of the fracture toughness and fatigue crack growth threshold representative of micro cracks. For this purpose, a series of tests are performed on small specimens containing sharp microscopic notches produced by means of the focused ion beam technique. The material parameters KIc and ΔKth determined in those tests are compared to respective results derived in tests on deeply cracked standard specimens. Finally, several series of fatigue tests performed on microscopic and macroscopic specimens with different geometry and loading conditions are evaluated using the fracture mechanics approach. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Iron and Steel, Mechanical Properties |