Abstract:
Through the logarithmic interpolation performed on the data of d
a/d
N and Δ
K from the results of crack growth rate test with high strength steel, a
p-d
a/d
N-Δ
K curve analysis method(d
a/d
N-Δ
K method) based on probability statistics theory was established. Compared with the
a-
N method, it is found that under any reliability
p within the effective range of Δ
K, the
p-d
a/d
N value obtained by d
a/d
N-Δ
K method is higher than that obtained by
a-
N method. When Δ
K is the maximum value of 100 MPa·m
0.5, the
p0.99-d
a/d
N value obtained by d
a/d
N-Δ
K method is about 25% higher than that obtained by
a-
N method. The
p-d
a/d
N-Δ
K curves obtained by d
a/d
N-Δ
K method coincide well with the distribution of d
a/d
N and Δ
K in the actual test, which means d
a/d
N-Δ
K method is an effective way to obtain the
p-d
a/d
N-Δ
K curves of materials.
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