6:15 PM - 7:30 PM
[PPS21-P13] The attenuation behavior of shockwaves induced by hypervelocity impacts investigated using the iSALE shock physics code
Keywords:Hypervelocity impacts, Shock propagation, High-pressure minerals, Shutter cones, Shock physics code
In this study, we conducted a series of numerical calculations using the iSALE shock physics code to investigate the shock attenuation under a various impact conditions. We are able to numerically solve the attenuation behavior of an impact-generated shockwave due to an interaction between the shockwave and a rarefaction wave from a free surface by using the iSALE. In addition, iSALE includes various material models, including granular materials, rocks, and metals, and a porosity compaction model. Thus, iSALE is highly suitable for our purpose. We obtained preliminary results as described following; (1) the target porosity significantly enhances the degree of the shock attenuation, (2) the degree of the shock attenuation for visco-elast-plastic bodies is larger than that for an inviscid fluid, (3) the internal friction of the target material changes the wave profile of the shockwave, (4) a higher target temperature leads to a higher degree of the shock attenuation. We are planning to construct the physical model based on a number of numerical results under a wide range of impact conditions.
We gratefully acknowledge the developers of iSALE, including Gareth Collins, Kai Wūnnemann, Boris Ivanov, Jay Melosh, and Dirk Elbeshausen.