非線形破壊パラメータT積分の光学的直接計測法開発研究 : 第2報, ハイブリッド数値解析・実敷法によるT積分コースティック計測

概要

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This paper presents a methodology of direct experimental measurement of the T^* integral which has great potential as a nonlinear (elastoplastic) fracture mechanics parameter. A hybrid numerical-experimental method was developed to measure the T^* integral by the maximum size of reflected caustic patterns. To this end, the formation process of the caustic pattern for an elastoplastic crack-tip in a compact tension specimen was simulated by the previously developed finite element simulation technique aided by computerized symbolic manipulation. Experimental measurement of・the caustic pattern in the compact tension specimen was also carried out. Both simulated and actual caustic patterns agreed very well. The relations between the T^* integral and the size of causticpattern were obtained f or various optical setups.
社団法人日本機械学会の論文
1990-05-25