Fatigue short crack propagation life prediction method under multi-axis variable amplitude loading
A technology of crack growth life and crack growth, applied in the field of fatigue short-crack growth life prediction under multi-axial variable amplitude loading, which can solve the problem of slow progress in multi-axial fatigue short-crack growth model research, lack of stress intensity factor, multi-axial fatigue short-crack Problems such as difficult test data
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[0031] The present invention is illustrated in conjunction with the accompanying drawings.
[0032] The present invention further illustrates the present invention through the fatigue test, the test is divided into two parts, one part is the short crack test under uniaxial constant amplitude loading, the stress ratio is -1, and the short crack growth data is observed. In the range of high cycle fatigue life, there is mainly a single dominant crack, which is convenient for measuring and calculating the crack growth curve. The other part is the multiaxial variable amplitude loading test, which calculates the range of the equivalent stress intensity factor under the condition of multiaxial variable amplitude loading.
[0033] A method for predicting the life of fatigue short crack growth under multi-axial variable amplitude loading, the specific calculation method is as follows:
[0034] Step 1): Multi-axis variable amplitude load processing and multi-axis cycle counting; in the...
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