Abstract
This article presents some insights on the fatigue of defects in steel materials and structures. Following a brief review of the underlying mechanisms and mechanics of fatigue, we present some mechanistic insights into the growth of single and multiple coplanar and non-coplanar surface cracks. These include single semi-elliptical cracks; coplanar semi-elliptical cracks; non-coplanar semi-elliptical cracks with vertical and lateral offset. The observed fatigue crack growth is compared with predictions from analytical/computational models of fatigue crack growth in which the interactions between cracks are modeled using fracture mechanics concepts and ASME/British Standard codes. The insights from these studies are then used to guide the development of mechanism-based finite element models for the prediction of fatigue crack growth in engineering structures and components with coplanar and non-coplanar cracks. The implications of the results are then discussed for the design of multi-scale multifunctional structures and components.
| Original language | English |
|---|---|
| Title of host publication | Comprehensive Structural Integrity |
| Publisher | Elsevier |
| Pages | V7-53-V7-72 |
| ISBN (Electronic) | 9780323919456 |
| DOIs | |
| State | Published - Jan 1 2023 |
Keywords
- Crack growth prediction
- Critical crack size
- Damage size considerations
- Damage tolerance requirements
- Defects configuration
- Fatigue crack growth rate
- Fatigue mechanism
- Fracture mechanics modeling
- Fracture modes
- Monotonic and cyclic loading
- Semi-elliptical cracks
- Stress intensity factor
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