3D constraint effect on 3D fatigue crack propagation
Source abstract
Abstract
Abstract As typical examples, tensile round bars with elliptical surface cracks are used to illustrate the three-dimensional (3D) constraint effect and the characteristics of 3D fatigue crack propagation. Based on the latest plastic constraint theory and the concept of equivalent thickness Beq, a practical 3D crack closure model, which can be as well used to obtain material da/dN−ΔKeff curves, is developed to eliminate the 3D constraint effect on 3D fatigue crack propagation. Further, in order to verify the present Beq based 3D crack closure model, the fatigue crack propagation lives of 20CrMo steel round bars with elliptical surface cracks and 7475-T761 aluminum alloy sheets with corner cracks in edge region of their holes are predicted in this paper. The analytical results based on the present 3D model show that the 3D constraint effect on 3D fatigue crack growth can be eliminated, and fatigue crack propagation lives for both 20CrMo steel round bars and 7475-T761 aluminum alloy sheets with straight holes can be predicted accurately. The Beq based 3D crack closure model in the present paper can also be applied to analyze other complicated 3D fatigue cracks.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fatigue and fracture mechanics · Numerical methods in engineering · Engineering Structural Analysis Methods
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (23)
Show source-provided references
1. Fatigue crack propagation of multiple coplanar crack with the coupled finite element/ fast marching method10.1016/S0020-7225(02)00322-1 ↗
2. An improved numerical technique for simulating the growth of planar fatigue cracks10.1111/j.1460-2695.1997.tb01495.x ↗
3. The influence of sheet thickness on crack propagation10.1108/eb034209 ↗
4. Three-dimensional analyses of plastic constraint for through-thickness cracked bodies10.1016/S0013-7944(98)00102-7 ↗
5. Three-dimensional fracture method for prediction of fatigue S–N curves
6. Analysis of closure in fatigue crack growth10.1115/1.3424286 ↗
7. Effects of constraint on crack growth under aircraft spectrum loading
8. Experimental study on stress intensity factors of tensile round bar with surface crack
9. Stress intensity factors for elliptical surface cracks in round bars with different stress concentration coefficient
10. Probability analysis on crack propagation of sucker rod material
11. A model for the through-thickness fatigue crack closure10.1016/S0013-7944(99)00055-7 ↗
12. The influence of cross-sectional thickness on fatigue crack growth10.1046/j.1460-2695.1999.00176.x ↗
13. Three dimensional constraint effect of crack propagation under aircraft spectrum
14. The influence of cross-sectional thickness on fatigue crack growth10.1046/j.1460-2695.1999.00176.x ↗
15. Stress intensity factors for two symmetric corner cracks
16. Raju, Newman Jr Jc. A re-evaluation of finite-element models and stress-intensity factors for surface cracks emanating from stress concentrations. NASA TM-101527; 1988.
17. H. Shen, Mechanism and life prediction of corrosion fatigue of high strength aluminum alloys. PhD Dissertation of Northwestern Polytechnology University, Northwestern Polytechnology University, China; 2000.
18. Wu Xueren, Handbook of metal mechanics properties of aircraft structures (2). Peking: Press of Aviation 1996 (in Chinese)
19. Three-dimensional fatigue fracture in complex environments
20. FASTRAN-II:A fatigue crack growth structural analysis program
21. Aeronautic Research Institute of China. Manual of Stress Intensity Factors. Chief edited by X. Wu. Science Press, Beijing; 1993.
22. Effects of three-dimensional constraint on crack growth under aircraft spectrum loading
23. Corrosive fatigue of structures with dimple holes under spectrum loading10.1046/j.1460-2695.2002.00518.x ↗