89 / 2025-03-13 14:57:37

Direct visualization of laser-driven dynamic fragmentation in tin by in situ X-ray diffraction

in situ X-ray diffraction,dynamic fragmentation

We present a novel method for investigating laser-driven dynamic fragmentation in tin using in situ X-ray diffraction (DXRD). Experimental results demonstrate the feasibility of simultaneously identifying the phase and temperature of the fragments through analysis of the diffraction pattern. Surprisingly, we observe a deviation from the widely accepted isentropic release assumption, as the temperature of the fragments is found to be more than 100 K higher than expected due to the release of plastic work during dynamic fragmentation. Our findings are further verified through extensive large-scale molecular dynamics simulations, in which strain energies are transferred into thermal energies during the nucleation and growth of voids, leading to an increase in the temperature. Our findings thus provide crucial insights into the impact-driven dynamic fragmentation phenomenon and uncover the significant influence of plastic work on material response during shock release.