Damage and failure mode maps of composite sandwich panel subjected to quasi-static indentation and low velocity impact

The influence of low velocity repeated impacts on residual compressive properties of honeycomb sandwich structures

Phenolic syntactic foam sandwich composites are potential materials for aerospace and marine applications because of their good strength to weight ratio, stiffness to weight ratio, fire resistance and better energy absorption characteristics. In the present work, syntactic foam is prepared by uniform mixing of cenosphere and phenolic resin in equal proportions. The effect of stiffening the syntactic foam core by resin impregnated paper honeycomb (RIPH) structure on compression behavior and energy absorption capacity of sandwich composites is experimentally investigated under flatwise and edgewise loading configuration. Bare RIPH core and only syntactic foam core sandwich composites are also investigated for comparison purpose. The results show that RIPH incorporated syntactic foam has the highest compressive properties and energy absorption capacity compared to only syntactic foam core sandwich composites. Microscopic features of syntactic foam fragments tested under flatwise compression are also investig...

Compression behavior and energy absorption capacity of stiffened syntactic foam core sandwich composites

This paper presents the experimental results pertaining to the deformation, failure mode, failure mechanism and residual strength for the compression-after-impact tests of woven polymer-based foam-...

Experimental study on the compression-after-impact behavior of foam-core sandwich panels

Honeycomb is considered an excellent structural material because of its high strength and shear rigidity, excellent energy absorbing property, high impact strength, lower weight, high crushing stress, and almost constant crushing force. Honeycomb being a cellular solid is a well-known core used to build a sandwich structure while making structural composites. Because of this excellent mechanical performance, honeycombs are frequently used in the aircraft industry as a core of sandwich panels and in the automotive industry as efficient impact attenuators. The hollow spaces in the honeycomb structure reduce weight but also ensure required strength, provided they are designed correctly. 3D woven honeycomb composite has a promising future in the lightweight application areas and can be the real substitutes for aluminum and other metal alloys as these structures provide structural integrity. In this review, the basic concept of textile-based 3D woven honeycomb composites, engineering design, manufacturing process, structure-properties relationship, and applications of 3D woven honeycomb fabrics and their composites are discussed in detail. Geometrical modeling of 3D woven honeycomb fabric and theoretical analysis of impact, flexural, and compression behavior of their composites are summarized to appreciate the potential advantages of textile-based honeycomb structural composites.

Review: 3D woven honeycomb composites

An experimental study of the in-plane compressive behavior of both aluminium and nomex composite sandwich panels with 8 ply carbon/epoxy skins was conducted. All sandwich panels were impact-damaged...

M.D. Hill

Papers

Impact Damage and Energy-absorbing Characteristics and Residual In-plane Compressive Strength of Honeycomb Sandwich Panels: