反射形コースティックス法による高張力鋼の弾塑性挙動に関する実験的検討

概要

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Recently, applications of the optical shadow method of caustics is a very powerful technique for measuring the value of the stress-intensity factor in a small scale yielding of the crack tip. However, the value of the elastic-plastic fracture parameter in a big scale yielding of the crack tip is J-Integral. In this study, the J-Integral value was determined by using the reflective caustics method and J-Integral method of an ASTM standard. The diameter of the caustics is measured experimentally by using the CT specimens. The specimen used here is a high tension steel of WEL-TEN 590 RE with different thicknesses and different initial crack lengths. J-Integral value of elastic-plastic fracture parameter is dependent to singular zone of a crack tip, characteristic of materials and optical parameters. It is concluded that hybrid method with J-Integral method of an ASTM standard is necesary to measure accurately the elastic-plastic fracture parameter J.
一般社団法人日本機械学会の論文
1998-06-25