Simplified analysis of large deflections for metal sandwich plates with various lattice cores subjected to impulsive loading

Wei Zhang,Shangjun Chen,Zili Xu,Jianxun Zhang,Qinghua Qin

doi:10.1177/1687814018787402

Wei Zhang, Shangjun Chen + Show 3 more

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https://doi.org/10.1177/1687814018787402

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Abstract

A new simplified analysis is carried out to predict the dynamic response of clamped metal sandwich plates with various lattice cores subjected to impulsive loading. Based on the yield condition for sandwich plate cross-section, the interaction of bending moment and axial force for the section is decoupled. The simplified analytical solutions of the maximum midspan deflection and structural response time are obtained. Moreover, neglecting the effect of bending moment, a simplified plastic-string model is developed. Comparisons of the present theoretical predictions with previous analytical and numerical results are conducted and good agreement is achieved for a wide range of sandwich core topologies.

Highlights

Sandwich structures consist of two thin face sheets and a lightweight core and the excellent properties of such structures mainly depend on the innovative core topologies design
Numerous numerical simulations were carried out to study the dynamic response of metal sandwich structures with a variety of core topologies subjected to air blast loading and underwater blast loading.[9,10,11,12]
The simplified theoretical solutions for the maximum midspan deflection and structural response time are derived by decoupling the moment–axial force interaction

Summary

Introduction

Sandwich structures have been widely used because of their excellent mechanical performance compared with monolithic structures, such as lightweight, high specific strength, high specific stiffness.[1,2,3] Usually, sandwich structures consist of two thin face sheets and a lightweight core and the excellent properties of such structures mainly depend on the innovative core topologies design. Numerous numerical simulations were carried out to study the dynamic response of metal sandwich structures with a variety of core topologies subjected to air blast loading and underwater blast loading.[9,10,11,12] many researchers[13,14,15,16] experimentally studied the shock resistance of metal sandwich structures using the metal foam projectiles which can be adopted to simulate the shock loading These experiments demonstrated that the sandwich structures have better shock resistances than monolithic solid structures under the same conditions

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