Abstract
This study presents a numerical investigation on low velocity impact response of sandwich panels with EPS foam core. The face-sheets and foam core are made of aluminum 6061-T6 and expanded polystyrene foam (EPS). The effect of foam core density was investigated on the impact energy absorption of the panel. The dynamic response of the panels was predicted using the finite element analysis package ABAQUS/Explicit. The material and geometrical nonlinearities were considered and the foam material was modeled as a crushable foam material. The cohesive response of the adhesive interface was modeled using the cohesive zone model. The temporal variations of contact force, kinetic energy histories and central permanent deflections were compared for different foam core densities and impact energies. The peak contact force levels and central permanent deflections are increased with increasing the impact energies. As the foam core density is increased, the capability of energy absorbing is increased.
Highlights
Sandwich structures based on strong, stiff skins bonded to a low density core material are used widely in high-performance applications such as, aerospace industries, automotive, civil engineering and transportation industry due to their high in-plane and flexural stiffness, good acoustic and thermal insulation, high energy absorption capability, very good corrosion resistance [1,2,3]
This paper proposes a numerical study of sandwich panels made with low density foam core and metal face-sheets under low velocity impact
The low velocity impact response of the sandwich panels is simulating three-dimensional non-linear finite element model to investigate the influence of the foam core density for different impact energy levels
Summary
Sandwich structures based on strong, stiff skins bonded to a low density core material are used widely in high-performance applications such as, aerospace industries, automotive, civil engineering and transportation industry due to their high in-plane and flexural stiffness, good acoustic and thermal insulation, high energy absorption capability, very good corrosion resistance [1,2,3]. Gunes and Arslan [13] investigated the low velocity impact behaviour of sandwich structures with aluminum honeycomb core experimentally and numerically They developed the numerical model of sandwich structures by using finite element method and it was in good agreement with experimental results in terms of contact forces and deformations. Feng and Aymerich [14] investigated the application of a finite element tool for simulating the structural and damage response of foam-based sandwich structures to low velocity impact They used three dimensional damage models in the FE code ABAQUS/Explicit and interfacial cohesive laws for simulating damage modes occurring in the composite face-sheets, such as fibre fracture, matrix cracking and delaminations. The low velocity impact response of the sandwich panels is simulating three-dimensional non-linear finite element model to investigate the influence of the foam core density for different impact energy levels
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