Vol. 5, No. 6, 2010

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ISSN: 1559-3959
Assessment of the performance of uniform monolithic plates subjected to impulsive loads

Jonas Dahl

Vol. 5 (2010), No. 6, 977–986
Abstract

The uniform monolithic metallic plate is the standard for assessing structural performance against blasts. For example, this has been the reference in recent work assessing the blast resistance of sandwich plates. Here, the performance of monolithic plates made from a hardening metal with high ductility is investigated by systematic optimization. The thickness distribution of clamped monolithic wide plates is optimized with respect to minimizing the permanent deflection at midspan under impulsive loads. The optimized plates are compared to a uniform plate of the same mass. Two load cases are considered: one with impulses acting uniformly along the plate, and one with impulses acting over a central patch. In both cases the reduction of permanent deflection of the optimized plate relative to the uniform plate is pronounced for small impulses but progressively smaller for larger impulses. For large impulses the optimal thickness distribution differs only slightly from that of a uniform plate. The study confirms the effectiveness of uniform thickness plates against large impulses.

Keywords
impulsive loads, FE simulations, finite deflections, blast resistance, monolithic plates
Milestones
Received: 4 May 2010
Revised: 13 October 2010
Accepted: 4 November 2010
Published: 1 January 2011
Authors
Jonas Dahl
Department of Mechanical and Manufacturing Engineering
Aalborg University
Pontoppidanstræde 103
DK-9220 Aalborg
Denmark