微小格子法による鉄-ステンレス系状金属複合板中のき裂閉口挙動の観察

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A fine-grating technique using laser diffraction was applied to measure the opening distance of fatigue cracks in the two-layered composite plates which were composed of low carbon steel and ferritic or austenitic stainless steel. A common technique of unloading elastic compliance method was also used for the purpose of comparison. It was observed that the crack opening stress near the crack opening stress near the crack tip determined by the direct observation of the movement of lattice points around the crack tip approximately agreed with that obtained by the unloading elastic compliance method. But the crack opening behavior in the composite plates was quite different from that in the monolithic plates due to the influence of residual stress. An actual stress intensity factor K'_<max> was therefore calculated for the composite plates based on the initial distribution of residual stress, and the crack opening behavior was estimated by using K'_<max> and the crack opening behavior of monolithic plates. The estimated trend showed a good agreement with the observed one for the composite plates composed of low carbon steel and austenitic stainless steel. But, some discrepancy was observed for the composite plates composite plates composed of low carbon steel and ferritic stainless steel. This seems to come from a relatively large difference in yield strength between tow materials, which may have a large influence especially in the neighborhood of the interface.
社団法人日本材料学会の論文
1985-06-15

微小格子法による鉄-ステンレス系状金属複合板中のき裂閉口挙動の観察

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