Buckling and crushing behavior of foam-core hybrid composite sandwich columns under quasi-static edgewise compression

Arameh Eyvazian,Faris Tarlochan,Massimiliano Gobbi,Seyed Ahmad Taghizadeh,Majid Moeinifard,Abdel Magid Hamouda

doi:10.1177/1099636219894665

Abstract

Buckling and crushing behavior of foam-core hybrid composite sandwich columns under edgewise compressive load is dealt in this study. Composite laminates with different stacking sequence configurations made of glass and Dyneema-woven fabrics and AL 2024-T3 sheets were used in combination of polyvinyl chloride foam core to manufacture the specimens. Effects of face sheet thickness and stacking sequence configuration, slenderness ratio, boundary conditions, and sandwich reinforcement with through-thickness resin pins on the buckling and crushing behavior of the specimens were investigated. The results revealed that using the resin pins changes the unstable Euler buckling mode to a more stable progressive end-crushing and significantly increases the buckling load, specific buckling load, and energy absorption capability, which are highly favorable. Also, the results showed that in the specimens with fiber metal laminates, the major failure modes are face sheet-core debonding and face sheet delamination. However, based on the results, specimen with hybrid face sheets made from Dyneema fabrics and aluminum plates has the highest buckling load as well as the highest specific buckling load. Also, a specific fixture was designed to laterally clamp the sandwich column which causes a reduction in the probability of specimen end-crushing and significantly increases the buckling load.

Highlights

Composite materials and structures have attracted huge attention in the last few decades due to their high mechanical properties, light weight, low manufacturing cost, and high reliability [1,2,3,4,5]
The bonding reinforcement between the face sheets foam core using resin pins and its effects on the buckling load, energy absorption, and failure mode of the sandwich column is reported
As can be seen from the figure, the specimen S-02 which was made from Dyneema/epoxy face sheets with a thickness of 3.6 mm has significantly higher buckling load compared to the specimen S-01 which was made from glass/epoxy composite face sheets with an approximately equal thickness of 3.66 mm

Summary

Introduction

Composite materials and structures have attracted huge attention in the last few decades due to their high mechanical properties, light weight, low manufacturing cost, and high reliability [1,2,3,4,5]. Among all the main features of sandwich structures are high specific bending stiffness, high strength, and high buckling resistance. The face sheets of the sandwich panels can be made of metal, composite, and fiber metal laminates (FML). The core of the sandwich panels is supposed to be less stiff and less resistant compared to the face sheets. The low density closed-cell polyvinyl chloride (PVC) foam is a favorite choice as the core material compared to honeycomb, balsa, aluminum foam, and lattice core [6,7,8,9]. Many researchers have investigated PVC foam-filled sandwich structures under several loading conditions such as flatwise [10], bending [11], and indentation [12] loading

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Conclusion