Residual Strength Analysis of Thin-Walled Structures with Multiple Site Damage Based on Crack Tip Opening Angle Method

Abstract

Abstract: This paper is to validate the crack tip opening angle (CTOA) obtained from the M(T) specimens to predict the residual strength of the thinwalled structures with multiple site damage. Using ABAQUS software to build the 2D M(T) finite element model, the crack growth process was simulated by CTOA fracture criterion with plane stress model. The predicted residual strength and loadcrack extension curves are close to the experimental results, the relative error is less than 6%. But for the multiple site damage specimens, the relative error is about 20%. Then the constraint around the crack tip is improved by using plane strain core (PSC) model. The constant CTOA and PSC were used to analyze thinwalled structures with multiple cracks configuration. The predicted results have good agreement with experiment， the relative error is less than 10%. Thus, the CTOA criterion and the
PSC model are useful and reliable to predict the residual strength for structures with multiple site damage.

Key words: crack tip opening angle(CTOA), plane strain core(PSC), residual strength, multiple site damage, crack growth

CLC Number:

O 346.1

HUANG Xiang-Long, ZHANG Xiao-Jing, BAI Guo-Juan, XU Wu, WANG Hai. Residual Strength Analysis of Thin-Walled Structures with Multiple Site Damage Based on Crack Tip Opening Angle Method[J]. Journal of Shanghai Jiaotong University, 2013, 47(04): 519-524.

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