Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published February 1, 2001 | Published
Journal Article Open

Critical behavior in spallation failure of metals

Abstract

Using molecular dynamics with an accurate many-body potential, we studied the rapid expansion of Ta metal following the high compression (50 to 100 GPa) induced by high velocity (2 to 4 km/s) impact. We find that catastrophic failure in this system coincides with a critical behavior characterized by a void distribution of the form N(v)∝V-τ, with τ∼2.2. This corresponds to a threshold in which percolation of the voids results in tensile failure. We define an order parameter (φ, the ratio of the volume of the largest void to the total void volume) which changes rapidly from ∼0 to ∼1 when the metal fails and scales with as φ∝(ρ-ρc)β with exponent β∼0.4, where ρ is the total void fraction. We found similar behavior for FCC Ni suggesting that this critical behavior is a universal characteristic for failure of solids in rapid expansion.

Additional Information

© 2001 The American Physical Society Received 30 October 2000; published 23 January 2001 This research was funded by Grant No. DOE W-7405-ENG-48 from DOE-ASCI-ASAP. The facilities of the MSC are also supported by grants from NSF (MRI CHE 99), ARO (MURI), ARO (DURIP), NASA, BP Amoco, Exxon, Dow Chemical, Seiko Epson, Avery Dennison, Chevron Corp., Asahi Chemical, 3M, and Beckman Institute.

Attached Files

Published - STRAprb01a.pdf

Files

STRAprb01a.pdf
Files (319.6 kB)
Name Size Download all
md5:59cf222ec84ac8941b709af8450b5ba6
319.6 kB Preview Download

Additional details

Created:
August 21, 2023
Modified:
October 13, 2023