Shock and Vibration

Shock and Vibration / 2010 / Article

Open Access

Volume 17 |Article ID 624958 | https://doi.org/10.3233/SAV-2010-0517

Mark J. Riley, Geoffrey T. Paulgaard, Julian J. Lee, Malcolm J. Smith, "Failure Mode Transition in Air-Backed Plates from Near Contact Underwater Explosions", Shock and Vibration, vol. 17, Article ID 624958, 17 pages, 2010. https://doi.org/10.3233/SAV-2010-0517

Failure Mode Transition in Air-Backed Plates from Near Contact Underwater Explosions

Received27 May 2009
Revised11 Aug 2009

Abstract

Recent experiments involving near-contact underwater explosions on air-backed plates suggest the following failure mode categories: (1) holing and petaling, (2) complete or partial edge tearing due to shock only, (3) complete or partial edge tearing due to shock and bubble collapse, and (4) large deformation without rupture. Finite-element analysis was used to further investigate the detailed response and failure of the plates, and determine the limit between center plate holing and edge failure. When compared with experimental results, finite-elements showed good agreement with the failure modes of the plates and reasonable agreement with the experimental deformations. It was found that the linear interaction criteria (LIC) failure between plastic strain and through-thickness shear stress produced results closer to experiments than the quadratic interaction criteria (QIC). For the 18~gauge specimens it was found that the through-thickness shear dominated the failure initiation for very close proximity charges, with the direct strain becoming dominant as the standoff was increased. For the thinner 20 and 22 gauge plates the direct strain was always found to be the dominant factor in the failure criteria.

Copyright © 2010 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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