Abstract
Linear elastic wave propagation induced by an impact on an elastic material was investigated. A numerical method based on Godunov's method was applied to simulate the phenomenon including interaction between various elastic waves such as compression, expansion, shear and their coupling. In order to compare with the numerical results, an impact test was performed. A transparent acrylic block was set as a specimen in a shock tube. The elastic waves induced by the shock wave in the block were visualized by using the schlieren method and the strains at several points on its surface were measured. The wave pattern and the strains were compared with the results of a numerical simulation. The results showed that the semiconductor strain gauges captured the rapid phenomena caused by the waves and that the numerical method was potentially feasible for concerning fields such as nondestructive inspections, impact tests.
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