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Abstract
The measurement of fatigue crack tip opening stress σop and closing stress σcl occurring in actual equipment is generally very difficult. This is the reason why the range of effective stress intensity factor is not sufficiently applied to the fatigue crack propagation behavior of actual equipment. In this study, the measurement of σop and σcl in large size specimen is carried out by means of the strain interference method and the crack opening and closing points of long crack are successfully measured. Futhermore, σop and σcl in a specimen subjected to a rotating bending stress is measured. From these experimental results, the strain interference method is expected to be applicable to the measurement of σop and σcl in actual equipment.
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