Response of metallic pyramidal lattice core sandwich panels to high intensity impulsive loading in air
By Kumar P. Dharmasena, H. Wadley, K. A. Williams, Zhenyu Xue, J. W. Hutchinson. 2011
148 citations recorded by the source corpus.
Abstract Small scale explosive loading of sandwich panels with low relative density pyramidal lattice cores has been used to study the large scale bending and fracture response of a model sandwich panel system in which the core has little stretch resistance. The panels were made from a ductile stainless steel and the practical consequence of reducing the sandwich panel face sheet thickness to induce a recently predicted beneficial fluid–structure interaction (FSI) effect was investigated. The panel responses are compared to those of monolithic solid plates of equivalent areal density. The impulse imparted to the panels was varied from 1.5 to 7.6 kPa s by changing the standoff distance between the center of a spherical explosive charge and the front face of the panels. A decoupled finite element model has been used to computationally investigate the dynamic response of the panels. It predicts panel deformations well and is used to identify the deformation time sequence and the face sheet and core failure mechanisms. The study shows that efforts to use thin face sheets to exploit FSI benefits are constrained by dynamic fracture of the front face and that this failure mode is in part a consequence of the high strength of the inertially stabilized trusses. Even though the pyramidal lattice core offers little in-plane stretch resistance, and the FSI effect is negligible during loading by air, the sandwich panels are found to suffer slightly smaller back face deflections and transmit smaller vertical component forces to the supports compared to equivalent monolithic plates.
Subfields: Mechanical Engineering, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/5d7ea25f337ae14d7e8341cc81969b4a9df1663c
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In Mechanical Engineering
In Mechanics of Materials
Citations in the corpus
- Experimental and numerical study of foam filled corrugated core steel sandwich structures subjected to blast loading (2014, background): “These include pyramidal cores [4–6], diamond celled lattice cores [7], corrugated cores [8], hexagonal honeycomb cores [9], foam cores [10], and square honeycomb cores [11].”
- A review of the recent trends on core structures and impact response of sandwich panels (2021, background): “The metallic pyramidal lattice core sandwich structures were manufactured and its large scale bending and fracture response to high-intensity impulsive load were studied.(181) It was shown that the pyramidal lattice core offered little in-plane stretch resistance, and the Fluid-structure interaction”