Abstract
Fatigue crack growth rates of structural steels (JIS SS 41, SM 50, SM 58 and HT 80) were measured under constant amplitude and variable amplitude block loadings. The measurement was carried out using Compact-type specimens according to the ASTM E 647-78T. The fatigue crack growth rates were measured in the range of ΔK between 10MPa√m and 35MPa√m. Within the test data, the crack growth rates of all four steels were in good agreement. The variable amplitude block loading was represented by an equivalent stress range computed by the root-mean-cube method, and crack growth rates under variable amplitude block loading were in good agreement with that under constant amplitude loading.
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