Shock recompaction of spall damage

Jones, David Robert; Fensin, Saryu Jindal; Morrow, Benjamin Mark; Martinez, Daniel Tito; Hixson, Robert Stewart

doi:10.1063/5.0011337

Title: Shock recompaction of spall damage

Journal Article · Sun Jun 28 00:00:00 EDT 2020 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0011337· OSTI ID:1774440

^[1];

^[1]; Morrow, Benjamin Mark ^[1];

^[1]; Hixson, Robert Stewart ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Spall fracture is a high strain-rate damage phenomenon associated with shock or impulsive loading events. When a material that has been subjected to shock compression is allowed to release, rarefaction waves propagate into the sample and reduce the internal stress to zero. If multiple rarefaction waves intersect, they generate tension which, if sufficient, can nucleate voids in the material. It has been observed in several works investigating spall fracture that although the shock-wave profiles suggested spall occurred, imaging of the recovered sample revealed no voids or cracks. In this study, we aim to determine whether a second shock event could recompact existing spall damage, and if so, what form does the microstructure at the recompaction interface have? Through a series of gas-gun flyer-plate impact experiments, we demonstrate that modest shock stresses of 2 GPa–3 GPa are enough to both fully compact a damaged copper target back to a state of zero porosity and, furthermore, drive recrystallization of the interface such that there is a new bond formed where the free surfaces were brought together.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1774440

Alternate ID(s):: OSTI ID: 1634174

Report Number(s):: LA-UR-20-22889; TRN: US2209781

Journal Information:: Journal of Applied Physics, Vol. 127, Issue 24; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 15 works

Citation information provided by
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