Study on Crack Component Fatigue Life Analysis Based on SIF Fitting

Abstract:

Article Preview

The present structure crack analysis method simplifies the crack as type I crack, and put the stress intensity factor (SIF) mathematical expression of infinite plate under the bi-directional even stress load into Paris formula to analyse the fatigue life of crack components. Due to the finiteness and complexity of component shape and the nonuniformity of the stress distribution in the engineering practice, which makes the SIF value inaccuracy according to the present method, so that the result of crack fatigue life has a large error. Considering the shortcomings of the method, this paper offers a new method which is using the finite element method to calculate SIF in different crack length directly. By means of function fitting, this method determines the mathematical relation between SIF and the crack length and changes the form of Paris formula based on the relation. Furthermore, it can analyse the fatigue life of crack components and improve the analysis accuracy theoretically.

Info:

Periodical:

Edited by:

Mohamed Othman

Pages:

656-660

Citation:

Y. Chen and Y. T. Sun, "Study on Crack Component Fatigue Life Analysis Based on SIF Fitting", Applied Mechanics and Materials, Vols. 229-231, pp. 656-660, 2012

Online since:

November 2012

Export:

Price:

$38.00

[1] Liu Dongxing, Tao Hua, Xue Hongqian, Tang Xingling. Research on Fatigue Crack Growth Life of Ultra-High Strength Steels in VHCF, Journal of Modular Machine Tool & Automatic Manufacturing Technique, 2011, 01: 5-8 (In Chinese).

[2] Mark Anthony James . A Plane Stress Finite Element Model for Elastic-plastic Mode I-II Crack Growth, Kansas State University, (1998).

[3] Yu Haifeng, Zhang Wenyuan, Zhang Yaochun. Experiment and Numerical Simulation on Low-cycle Fatigue Behavior for Q235 Welded I-section Steel Bracing Members, Journal of Sichuan University(Engineering Science Edition), 2012, 02: 182-189 (In Chinese).

[4] Ayhan A O.Mixed Mode Stress Intensity Factors for Deflected and Inclined Corner Cracks in Finite-thickness Plates.International Journal of Fatigue, 2007, 29: 305-317.

DOI: https://doi.org/10.1016/j.ijfatigue.2006.03.006

[5] Nao-Aki Noda, Toshiaki Kihara, Daisuke Beppu. Variations of Stress Intensity Factor of a Semi-elliptical Surface Crack Subjected to Mixed Mode Loading. International Journal of Fracture, 2004, (02), 127-129 (In Chinese).

DOI: https://doi.org/10.1023/b:frac.0000035054.88722.43

[6] Zhao Zhangyan, Sun Guozheng. Faults Distribution of Port Cranes' Metal Structure, Journal of Wuhan Transportation University, 1995, 12: 679-680 (In Chinese).