FATIGUE CRACK GROWTH BEHAVIOUR OF 7475-T7351 ALUMINIUM ALLOY UNDER CONSTANT AMPLITUDE LOADING

Zhang shi-jie; Nowack?¤

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Journal of Aeronautical Materials ›› 1986, Vol. 6 ›› Issue (2) : 43-49.

FATIGUE CRACK GROWTH BEHAVIOUR OF 7475-T7351 ALUMINIUM ALLOY UNDER CONSTANT AMPLITUDE LOADING

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Abstract

Constant amplitude fatigue crack growth tests were performed over a wide range of R-ratios on center cracked 8 mm thick Al 7475-T7351 specimens.In consideration of that making a determination of crack opening stresses is important for the crack growth life prediction based on the crack ciosure concept and it is necessary to find a way that is convenient to determine the effc-dive stress intensity factor range Keffin engineering practice, this paper derived the empiriacl crack opening stress expression of the material used in This investigation from the crack growth rate data da/dN.Consequently the crack growth behaviour of a wide range of R ratios can expresse dunitedly by the effective stress intensity factor range Keff.It is found that dimensionless crack opening stresses decrease as the applied maximum stress level increases.Fracture analysis results indicated that the fracture transition from tensile mode to shear mode during the test was controlledmainly by Keff and a opmaxvaluesincrease as cracks growth from the tensile mode to the shear mode.

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Zhang shi-jie, Nowack?¤. FATIGUE CRACK GROWTH BEHAVIOUR OF 7475-T7351 ALUMINIUM ALLOY UNDER CONSTANT AMPLITUDE LOADING[J]. Journal of Aeronautical Materials, 1986, 6(2): 43-49

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