片側き裂をもつプラスチック板材のぜい性破面模様

概要

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Fracture surface marks of the both-end-closed ones of small circles, various ellipses and the one-end-opened ones of parabolas and hyperbolas are investigated by both analytical and experimental methods especially in single edge notched plastic sheet specimens of DCB (Double Cantilever Beam), GDCB (Grooved Double Cantilever Beam) and SEM (single Edge Notched) in tension. The velocity of a main crack presumably increases rapidly to its maximum value and then decreases gradually with some oscillation as it propagates. The dynamic stress-intensity factor and the dynamic strain-energy release rate are calculated and both of them change with oscillation as the main crack proceeds. These values seem to affect the appearances of fracture surface marks in their shapes and sizes, and an e/C_<02> value (a relative interference appearing distance) and a d/C_<02> value (a relative critical distance) of the marks. Experimental observations give good agreement with the analytical relations. Both normal and abnormal fracture surface marks are well expressed by the two dimensional equation of marks.
一般社団法人日本機械学会の論文
1986-04-25