Abstract
The growth of physically small fatigue cracks (crack depth a<ge>150μm) was investigated in a high tensile strength steel and a high strength low alloy steel at a load ratio of 0.05 under pulsating tension loading. It is found that the growth characteristics of small fatigue cracks are consistent with those of large through cracks, as far as net stresses do not exceed yield stress of the materials. For medium and high strength steels having both yield stress more than approximately 500 MPa and fine microstructure, therefore, it is also suggested that growth characteristics of large cracks can be used for defect evaluation and life prediction of small fatigue cracks in engineering applications.
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