The Two Dimensional Analysis of Surface Markings in Brittle Plastic Plates : An Application of the Velocity Equation at Constant Force

概要

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Surface markings in the fast fracture are approximately expressed in equations using both a constant velocity model in which the primary and the secondary crack fronts propagate at each constant velocity where the velocity ratio varies and an acceleration model in which the primary one is assumed to propagates with an acceleration. The results of the latter can accurately predict the surface markings of a point (a small circle), an approximate ellipse and a parabola observed in the engineering plastic plates of the unsaturated polyester resin. The critical distance for the primary crack front first to activate the secondary nucleus and the interference distance for both of crack fronts first to interfere are also determined.
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