Self-emitted surface corrugations in dynamic fracture of silicon single crystal.

ABSTRACT: When a dynamic crack front travels through material heterogeneities, elastic waves are emitted, which perturb the crack and change the morphology of the fracture surface. For asperity-free crystalline materials, crack propagation along preferential cleavage planes is expected to present a smooth crack front and form a mirror-like fracture surface. Surprisingly, we show here that in single crystalline silicon without material asperities, the crack front presents a local kink during high-speed crack propagation. Meanwhile, local oscillations of the crack front, which can move along the crack front, emerge at the front kink position and generate periodic fracture surface corrugations. They grow from angstrom amplitude to a few hundred nanometers and propagate with a long lifetime at a frequen

SUBMITTER: Wang M 

PROVIDER: S-EPMC7382254 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature