A series of crack propagation rate tests of compact tension specimen for Q235 steel are conducted. Compliance method and pixel method are introduced to measure the crack length, and the comparison of the two methods is proposed. Incremental polynomial method and least square method are applied to fitting and regressing the test data. By statistical analysis, the statistical characteristics of crack propagation parameters C and m are obtained and the fatigue propagation rate described by Δ CMOD and ΔK is proposed. On the basis of probability fracture mechanics theory, the functions of crack propagation rate under different probability standards are presented.

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