Wave motion resulting from adhesive avalanche between metallic surfaces

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Abstract
Atomistic simulations of impacting copper surfaces were performed using a many-body potential defined by the embedded-atom method. In the course of impact, as the impact surfaces approach each other, an adhesive avalanche occurs. That is, at a separation of roughly 2 Å beyond the bulk interplanar spacing, one or both surface layers becomes unstable and abruptly moves towards the other. The adhesive avalanche signals a transition from an initial system with two distinct surfaces (at the impact interface) to one possessing no identifiable surfaces. This motion generates a brief (

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