板試験片切欠き底の面内曲げ低サイクル疲労表面疲労き裂進展速度則の検討

概要

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The fatigue test of surface crack propagation was conducted on the plate specimen with the small hole at a notch root in the low cycle fatigue region. The cyclic strain at a notch root was measured by strain gage and the cyclic strain behavior have been shown as the relationship between strain and number of cycles. The rate of surface fatigue crack propagation at a notch root were found from the crack length curve. It is found that the rate of surface fatigue crack propagation is expressed as the mth power of the range of strain intensity factor. Where the strain intensity factor is defined as the parameter multiplied the cyclic strain range at a notch root by root of the surface crack length. The m of mth power of the strain intensity factor range are different in the middle and in the edge of plate thickness. These experimental data and discussion have been presented.
長崎大学の論文