音弾性法による溶接残留応力の測定 : 材料異方性の評価

概要

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An acoustoelastic technique is useful for nondestructive measurements of residual weld stresses. It is difficult, however, to distinguish the influence of the residual stresses and of the material anisotropy on results. In this study, a new method to evaluate the material anisotropy is proposed. To confirm its applicability and utility, experiments were performed using butt weld joints of a carbon steel. The results obtained are follows; (1) In the weld metal, a discontinuous point is found in addition to a minimum point on the oscilloscope traces of received echos as the ultrasonic transducer is rotated. (2) Based on the above result, a new method to separate the influence of the material anisotropy from that of the residual stress is proposed. Its applicability and utility are confirmed experimentally. (3) The material anisotropy of the weld metal is much stronger than that of the base metal.
一般社団法人日本機械学会の論文
1987-12-25