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Sandwich-structured composite

About: Sandwich-structured composite is a research topic. Over the lifetime, 5853 publications have been published within this topic receiving 101126 citations.


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TL;DR: In this article, finite element analysis of several configurations of the TSD specimen, viz. a homogeneous and isotropic specimen, interface crack specimen, and sub-interface crack specimen are presented.
Abstract: The Tilted Sandwich Debond (TSD) specimen has recently been introduced for characterization of debond fracture of foam core sandwich panels. A precracked sandwich specimen is attached to an incline, and debonding is achieved by loading the partially debonded top face until further crack propagation occurs. In this paper we present finite element analysis of several configurations of the TSD specimen, viz. a homogeneous and isotropic specimen, interface crack specimen, and sub-interface crack specimen. Stress intensity factors are determined using various mesh refinements over a range of tilt angles, and the mode mixity is related to the potential for crack deflection (kinking) into the core. Irrespective of the tilt angle, it was found that cracks located at the face/core interface displayed amode mixity favorable for kinking into the core. Experiments on a sandwich with a H100 PVC foam core revealed kinking at an angle in reasonable agreement with the prediction. After kinking, analysis of sub-interface ...

33 citations

Journal ArticleDOI
TL;DR: In this article, the buckling response and nonlinear behavior of sandwich panels with soft cores that have temperature-dependent mechanical properties and are subjected to thermally induced deformations and mechanical loads simultaneously were investigated.
Abstract: This paper deals with the buckling response and nonlinear behavior of sandwich panels with soft cores that have temperature-dependent mechanical properties and are subjected to thermally induced deformations and mechanical loads simultaneously. This study investigates the effects of the degradation of properties of the core as a result of rising temperature on the response of the sandwich panel. Analyses are carried out for cases of pure thermal loading, with either uniform or gradient temperature fields through the depth of the panel, as well as for thermal loading acting simultaneously with external mechanical loads. The formulation is based on variational principles along with the high-order sandwich panel approach. It takes into account the flexibility of the core in the vertical direction as well as the dependency of the mechanical core properties of the temperature distribution through the core depth. The stress and deformation fields of the core have been solved analytically, including the case where the temperature-dependent properties attain a complex pattern. The buckling equations are derived using the perturbation technique, yielding a set of nonlinear algebraic equations for the case of a simply-supported panel and a uniform temperature field. The critical temperatures and modes of wrinkling and global buckling are determined numerically for some foam types of core made by Rohacell and Divinycell. The nonlinear response caused by thermally induced deformations is presented for Divinycell foam core with different temperature distributions through the depth of the core. Finally, the nonlinear response caused by the simultaneous action of external mechanical loading and increased temperatures on the compressive or the tensile side of the panel, with a thermal gradient through the core depth, is presented. The interaction between elevated temperatures and mechanical loads changes the response from a linear into an unstable nonlinear one when the degradation of the mechanical properties due to temperature changes is considered and the panel is unrestrained. Moreover, the unstable nonlinear behavior becomes even more severe when the face, loaded in compression, is subjected to elevated temperatures. This study reveals that a reliable, realistic design of a sandwich panel that is subjected to elevated temperature (within working temperature range) and mechanical loads must take into account the degradation of the properties of the core as a result of the thermal field even at working temperature range, especially when cores made of foam are considered.

33 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the evolution of sandwich panels based on recent work and older sources, focusing on the trends concerning sandwich panel achievements and applications, core materials, core designs, types of failure mechanism and factors which contribute to the failure of sandwich panel.

33 citations

Journal ArticleDOI
TL;DR: In this paper, a comparative study on impact damage detection in light composite sandwich panels is presented, where three different non-destructive testing methods are used to characterize damage in a test specimen that resulted from a controlled low velocity impact event.

33 citations

Journal ArticleDOI
TL;DR: In this paper, a 2D micropolar equivalent single-layer (ESL), first-order shear deformation (FSDT) plate model for 3D web-core sandwich panels is developed.

33 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023194
2022402
2021298
2020299
2019273
2018271