高速進展き裂が分岐する瞬間の平板試験片両面における同時撮影

概要

論文の詳細を見る
Pulsed holographic microscopy is applied to take photographs of rapidly bifurcating cracks in PMMA plate specimens. The cracks are of the opening mode and propagate at a speed more than 600 m/s. The photographs are simultaneously taken on the both side of the specimens about 10 μs after bifurcation. The photographs show that, in many cases, the bifurcated crack's shape on one side of a specimen is apparently different from that on the other side of the specimen. Even in the case of cracks that have similar shapes on the both sides of specimens, the crack shapes are different near the bifurcation points on the both sides of the specimens. These facts indicate that the rapid crack bifurcation in PMMA is three dimensional phenomenon. Also shown is the example that two crack branches have different crack opening displacements. It means that the bifurcation of the crack was asymmetric with respect to the line along the mother crack.
2002-11-25