**Numerical Analysis Methods of Structural Fatigue and Fracture Problems** Numerical Analysis Methods of Structural Fatigue and Fracture Problems

DOI: 10.5772/intechopen.72285

Qiu Zhiping, Zhang Zesheng and Wang Lei

Additional information is available at the end of the chapter Qiu Zhiping, Zhang Zesheng and Wang Lei Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/intechopen.72285

#### Abstract

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mizdat; 1991

234 Contact and Fracture Mechanics

MATI; 2009. 520 p

2410-3535-2013-1-3-6

Fatigue and fracture problems, which lead to 95% of structural failure, have attracted much attention of engineers and researchers all over the world. Compared with experimental method, numerical simulation method based on empirical models shows its remarkable advantages in structure design because of less cost and higher efficiency. However, the application of numerical simulation method in fatigue lifetime prediction is restricted by low accuracy and poor applicability in some circumstances. Most numerical method is based on empirical models. This chapter first reviews various kinds of empirical models of fatigue and fracture problems, including some modifying methods of basic empirical models, which have been widely applied to fatigue lifetime prediction and indicated their advantages and disadvantages. Then, FEM is introduced as an important method to obtain stress intensity factor or crack growth route. At last, this chapter is finished with existing problems and current trends in fatigue lifetime prediction via numerical method.

Keywords: fatigue lifetime prediction, crack propagation, numerical method, empirical model, Paris law, perturbation approach, extended finite element method, fractal geometry
