Calculation of Fatigue Crack Initiation Life by Coupled Finite Element Method

Abstract:

Applied damage mechanics and coupled finite element method, to study the fatigue crack initiation life problem. Application of coupling finite element method, the damage coupling effect can be modified through the global stiffness matrix to achieve. The step length of the damage evolution is divided by the damage variable of the critical element, and then the damage evolution is analysised. The corresponding stiffness matrix and loading matrix can be obtained continually under the condition of increasing the damage evolution step of the critical element,then the equivalent stress can be calculated. The corresponding fatigue crack initiation life can be calculated by using the damage evolution equation, the progress will not stop until the damage degree of the critical element reaches to one. The fatigue crack initiation life is obtained by adding the fatigue crack initiation lives with different damage variable.

• Periodical: Applied Mechanics and Materials (Volumes 275-277)
• Pages: 189-192
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.275-277.189
• Online since: January 2013
• Authors: Wen Feng Tan, Tao Chen
• Keywords: Coupied Finite Element Method, Crack Initiation Life, Damage Mechanic, Fatigue Crack

References

[1] Z. Zhuang, C. P. Jiang. Engineering fracture and damage (Mechanical Industry Press, China 2004). (in Chiness).

[2] X. Zhang, J. Zhao: Applied Fatigue Damage Mechanics of Metallic Structural Members (National Defence Industry Press, China 1998). (in Chiness).

[3] B. L. Fu: The Variational Principles of Coupled Systems in Photoelasticity. Applied Mathematics and Mechanics, Vol. 15(1994), p.37.

[4] B. Y. Yang, Y. T. Zhang: Engineering elastic-plastic mechanics (Mechanical Industry Press, China 2003). (in Chiness).