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Updated: Jan 9, 2026
High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
Wave-Partition-Governed Dual-Site Spallation in Single Crystals
Youlin Zhu1, Sheng Qian1, Lianfu Qiu1
1Department of Aeronautics and Astronautics & College of Intelligent Robotics and Advanced Manufacturing, Fudan University, Shanghai, 200433, China.
None:
The spall failure in shock-loaded perfect single crystals reveals significant orientation dependent characteristics, yet the fundamental relationship between shock wave propagation anisotropy and fracture mechanisms remains unclear. Employing large-scale molecular dynamics simulations, a novel dual-spallation phenomenon governed by anisotropic elastic-plastic wave separation is discovered. Crystal orientations exhibiting stronger wave separation (e.g., [111]) demonstrate a characteristic two-stage spallation pattern, contrasting sharply with the conventional single-spallation behavior observed in orientations like [100]. Systematic analysis through quantitative void distribution statistics, fracture surface energy evaluation, and modified Nucleation and Growth (MNAG) model reveals that this wave-mediated mechanism improves damage resistance through two synergistic effects: attenuation of rarefaction wave interaction and suppression of catastrophic void coalescence. The findings establish stress wave engineering via crystalline orientation control as a vital strategy for developing next-generation impact-resistant materials, providing both fundamental insights into dynamic fracture physics and practical guidelines for material design.
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