プラスチック引張試験片のき裂先端半径と伝ぱ速度および破面模様 : UPおよびPMMA樹脂板材の結果

概要

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The crack velocities of compact-tension type sheet specimens having various crack-tip radii are experimentally investigated under tension using UP and PMMA plastics. The crack velocity increases rapidly to the maximum value and decreases slowly as the crack propagates in a specimen. This velocity change is approximated by the existing velocity equation for the double-cantilever-beam type specimen. The mean velocity decreases as the crack-tip radius sharpens. The density of the fracture surface marks which appeared in the fracture surface changes with respect to the relative crack length C_1/C_0, in a manner similar to the way the crack velocity changes in each specimen. Fracture strength and the fracture surface marks also decrease as the crack-tip radius sharpens, showing that the velocity and the number of marks tend to be smaller the lower the fracture strength. The relationships among fracture strength, the number of fracture surface marks and the mean velocity are discussed.
一般社団法人日本機械学会の論文
1989-11-25