Journal ArticleDOI
Indentation failure in composite sandwich structures
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TLDR
In this paper, a combined analytical and experimental investigation of the indentation failure of a composite sandwich panel has been undertaken, where two cases have been studied: a sandwich panel with carbon/epoxy facing and a PVC foam layer supported on a rigid base and indented at the center with a cylindrical indentor.Abstract:
A combined analytical and experimental investigation of the indentation failure of a composite sandwich panel has been undertaken. Two cases have been studied: a sandwich panel with carbon/epoxy facing and a PVC foam layer supported on a rigid base and indented at the center with a cylindrical indentor; and a sandwich beam with symmetrical facing and core materials as in the sandwich panels. The load-deflection behavior of the loaded facing was monitored during the test. Strains were also measured near the load on both surfaces of the facing using embedded strain gages. A full-field analysis of the in-plane displacements in the foam was conducted using the moire method. The problem was modeled as an elastic beam resting on an elastic-plastic foundation. Initiation of indentation failure occurs when the foundation yields, while catastrophic failure takes place when the compression facing fractures. The experimental results are in good agreement with the results of the analytical modeling based on the Winkler foundation.read more
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Journal ArticleDOI
Low velocity impact behavior of composite sandwich panels
TL;DR: In this article, the low velocity impact behavior of composite sandwich panels consisting of woven carbon/epoxy facesheets and a PVC foam core was studied experimentally and a straightforward peak impact load estimation method gave good agreement with experimental results.
Journal ArticleDOI
Failure Modes of Composite Sandwich Beams
TL;DR: In this article, a thorough stress analysis and applying appropriate failure criteria in critical regions of the beam is performed to predict tensile or compressive failure of the facesheets, debonding at the core/facesheet interface, indentation failure under localized loading, core failure, wrinkling of the compression facesheet, and global buckling.
Journal ArticleDOI
Compression facing wrinkling of composite sandwich structures
TL;DR: In this paper, a thorough investigation was conducted of face wrinkling failures of sandwich columns under compression and beams in three-and four-point bending and cantilever beams under end loading.
Journal ArticleDOI
Fatigue of Foam and Honeycomb Core Composite Sandwich Structures: A Tutorial:
TL;DR: In this paper, a tutorial on the subject of fatigue of foam and honeycomb core composite sandwich structures is presented, where several different analytical models for predicting the fatigue life of sandwich composites are presented.
Journal ArticleDOI
Low velocity impact denting of HSSA lightweight sandwich panel
D.W. Zhou,William James Stronge +1 more
TL;DR: In this paper, the impact force during low speed impact on circular sandwich panels was calculated using finite element analysis using ABAQUS to calculate impact damage on sandwich panels and the dependence of damage on both structural parameters and impact variables was investigated.
References
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Book ChapterDOI
Beams on Elastic Foundation
TL;DR: In this paper, a numerical method for the solution of the problem of a beam on an elastic foundation is presented, which can be used as a basis for a sheet pile wall program, and for a laterally loaded pile in a layered soil.
Journal ArticleDOI
Failure of cellular foams under multiaxial loading
TL;DR: In this article, a thorough investigation of the mechanical behavior of a closed-cell cellular foam (Divinycell) under multiaxial stress conditions was undertaken, and two types of Divinycell, H100 and H250, with densities of 100 and 250 kg/m3, respectively, were investigated.
Journal ArticleDOI
Localized bending effects in sandwich panels: photoelastic investigation versus high-order sandwich theory results
Ole Thybo Thomsen,Y. Frostig +1 more
TL;DR: In this article, the problem of local bending in sandwich panels with a soft core was investigated by conducting a series of photoelastic experiments, and the experimental results were compared with analytical results obtained using the high-order sandwich panel theory (HSAPT).
Journal ArticleDOI
Indentation of composite sandwich beams
TL;DR: In this paper, the authors analyzed the fracture load of a sandwich beam as linear elastic bending of the top skin on a rigid-perfectly plastic foundation (the core), and the theoretical predictions of fracture load from this simple theory were shown to be in good agreement with experimental results from indentation tests on strips of sandwich panel, with glass-fibre-reinforced plastic skins and foam core, supported on rigid base.
Journal ArticleDOI
Indentation failure of composite sandwich beams
F.M. Shuaeib,P.D. Soden +1 more
TL;DR: In this paper, the top skin is modeled as a linear elastic beam and the core as an elastic-plastic foundation, which is used successfully to predict the loads at which the core yields and the skin fails.