Relationship between a non-spherical collapse of a bubble and a stress state inside a wall

This study performed a fluid/material coupled numerical simulation of the first stage non-spherical collapse bubble near wall and investigated stress state inside elastic material according to change in stand-off distance γ between wall. The relationship behavior propagation waves was confirmed for typical modes: pancake-shaped mode at = −0.3, hemispherical 0, microjet 0.3 < 1.0, detaching > 1.2. influence area, which is an index damage, estimated. At area caused by narrow shallow material; contrast, that pressure spreads more widely deeply, especially material. means wave has larger than on damage even though maximum value equivalent nearly identical wave. Additionally, depth 0.5 although volume are 0 0.5. indicates case toroidal rebound attaching potential cause deeper comparison with collapse.