Preliminary assessment of sandwich plates subject to blast loads

Abstract

The question motivating the present study is whether metal sandwich plates with su ciently strong cores are able to sustain substantially larger blast loads than monolithic solid plates of the same material and total mass. Circular plates clamped at their edges are considered under blast loads large enough to produce substantial de ections. The material is elastic-perfectly plastic. Material strain-rate dependence and fracture are neglected. A dynamic ÿnite element formulation for elastic-plastic solids is employed to analyze the plate response. Uniformly distributed blast impulses are considered. As a basis for comparison, complete results are obtained for solid plates for both zero-period and ÿnite-period impulses. Similar computations are carried out for a set of sandwich plates having tetragonal truss cores. The potential for superior strength and energy absorbing capacity of the sandwich plates is demonstrated compared with solid plates having the same mass. The importance of both the strength and energy absorbing capacity of the core are highlighted for superior blast resistance. Proposals for further research are made. ?

The response of clamped sandwich plates with lattice cores subjected to shock loading

“…The experiments at the higher values of I 0 have the ratio τ/T < 1 and thus dynamic by definition. It is worth noting that Jones (1989) and Xue and Hutchinson (2003) have shown that loading may be considered to be impulsive for monolithic and sandwich plates if τ/T < 0.01. Thus, while I 0 has been used in this study to identify the level of loading, these experiments are not in the impulsive loading regime and I 0 alone is insufficient to define the loading.…”

“…For example, Wang and Hopkins (1954) and Symmonds (1954) analysed the impulsive response of clamped circular plates and beams, respectively. Recently, Xue and Hutchinson (2003) carried out a preliminary finite element (FE) investigation of the shock response of clamped circular sandwich plates containing a foam-like core, with the effects of fluid-structure interaction neglected. Subsequently, Qiu et al (2005) proposed an analytical model for the shock response of clamped circular sandwich plates by modifying the Fleck and Deshpande (2004) sandwich beam model.…”

Blast resistance of stiffened sandwich panels with closed-cell aluminum foam

“…These panels possess excellent properties such as lightweight, high specific stiffness, moisture independency, and corrosion resistance. In the past, several researchers studied blast response of the sandwich foam panels and presented the effectiveness of these panels under blast loading (Guruprasad and Mukherjee, 2000aand 2000b, Hanssen et al, 2002aand 2002b, Qiu et al, 2003, Xue and Hutchinson, 2003, Radford et al, 2006, Sriram et al, 2006, Nemat-Nasser et al, 2007, Bahei-El-Din and Dvorak, 2008, Tekalur et al, 2008, Karagiozova et al, 2009, Zhu et al, 2009, and Langdon et al, 2010. Recently, with the advancement in technology, metal foam has emerged as an important material in blast resistance applications due to their high energy absorption potential (Ashby et al, 2000).…”

“…Most of the past research work has been carried out on the sandwich foam panels with different varieties of core ranging from fiber reinforced polymer (FRP), natural material (air, sand/soils), polymeric foams, honeycombs and commercially available metal foams (Hanssen et al, 2002aand 2002b, Qiu et al, 2003, Xue and Hutchinson, 2003, Radford et al, 2006, Sriram et al, 2006, NematNasser et al, 2007, Bahei-El-Din and Dvorak, 2008, Tekalur et al, 2008, Karagiozova et al, 2009, Zhu et al, 2009, Langdon et al, 2010, Jing et al, 2013, Chang et al, 2013, and Liu et al, 2013. No studies, however, have been reported on the stiffened sandwich foam panels and their blast response, except author's recent work on the response of stiffened polymer foam sandwich structures under impulsive loading (Goel et al, 2013a).…”

The mechanical response of metallic sandwich beams under foam projectile impact loading

“…Results show that the sandwich panel response has only a low sensitivity to the magnitude of the core compressive strength and to the degree of strain hardening in the facesheets. The corresponding finite element simulations have been undertaken by Xue et al [18] to valid the analytical model. A good agreement has been obtained between the numerical and theoretical results.…”