Fatigue Crack Propagation under Mixed Mode Loading

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Cao Gui-xin, Ju Ding-yi. Fatigue Crack Propagation under Mixed Mode Loading[J]. Applied Mathematics and Mechanics, 1984, 5(2): 229-238.

Citation:

Cao Gui-xin, Ju Ding-yi. Fatigue Crack Propagation under Mixed Mode Loading[J]. Applied Mathematics and Mechanics, 1984, 5(2): 229-238.

Citation:

Cao Gui-xin, Ju Ding-yi. Fatigue Crack Propagation under Mixed Mode Loading[J]. Applied Mathematics and Mechanics, 1984, 5(2): 229-238.

Department of Mechanical Engineering, East China Jnstitute of Chemical Technology, Shanghai

Abstract

Mixed mode fatigue crack propagation is analyzed in this paper, using a center cracked plate geometry, loaded under uni-axial cyclic tension.Based on maximun principal stress criterion, a modified Paris expression of fatigue crack growth rate is derived in terms of △K and crack angle β₀ for an inclined crack.It is also shown that it is more convenient to express the Paris equation by means of crack length projected on the x-axis, a_x rather than the actual length, a, itself.The crack trajectory due to cyclic loading is predicted. β₀ is varied from 20°to 90°. Experimental data on Type L₃ aluminium agree fairly well with predicted values when β₀ exceeds 30°.

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