# Wave‐Partition‐Governed Dual‐Site Spallation in Single Crystals

## TL;DR

This paper explores how crystal orientation affects spallation in single crystals under shock loading, revealing a new dual-spallation mechanism that could improve material resistance to impact.

## Contribution

The study identifies a novel dual-spallation phenomenon driven by anisotropic elastic-plastic wave separation in single crystals.

## Key findings

- Crystal orientations like [111] show a two-stage spallation pattern due to strong wave separation.
- The dual-spallation mechanism reduces damage by attenuating rarefaction waves and suppressing void coalescence.
- Controlling crystal orientation can engineer stress waves to enhance damage resistance in materials.

## Abstract

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.

Crystalline anisotropy shapes shock‐wave propagation and the resulting damage evolution in single crystals. Large‐scale molecular dynamics and damage modeling uncover a dual‐spallation mechanism driven by anisotropic elasticplastic wave separation, which mitigates damage accumulation. This mechanism offers a promising route for designing extreme‐environment nanomaterials.