A numerical creep analysis on the interaction of twin semi-elliptical cracks

作者：Si Jun; Xuan Fu Zhen^*; Tu Shan Tong

来源：International Journal of Pressure Vessels and Piping, 2008, 85(7): 459-467.

DOI：10.1016/j.ijpvp.2008.02.001

• creep crack growth
• surface flaw
• C* integral
• finite element analysis

The interaction and coalescence of multiple flaws will significantly influence the service life of components. In this paper, the interaction of two identical semi-elliptical cracks in a finite thickness plate subjected to the remote tension is investigated. The results indicated that interaction of multiple cracks is different between the time-dependent fracture characterized by C-integral and linear elastic fracture noted by SIF. The magnifying factors of creep fracture are obviously larger than that of the linear elastic fracture cases. Therefore, the current interaction and coalescence rule developed from linear elastic fracture analysis may lead to a non-conservative result when it is used in the assessment of creep crack. At the end, an empirical equation is developed based on the numerical results.

• 出版日期2008-7
• 单位东华大学