Topic
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 paper, the effects of temperature on the mechanical behaviors of composite rods and carbon fiber composite truss sandwich cores were investigated in the range of −60°C to 260°C and characterized as functions of temperature.
Abstract: The effects of temperature on the mechanical behaviors of composite rods and carbon fiber composite truss sandwich cores were investigated in this paper. Strength and stiffness of composite rods in fiber-aligned direction were measured in the range of −60 °C to 260 °C and characterized as functions of temperature. The research on out-of-plane compressive properties of sandwich panels with truss cores for temperature variation indicated that strength and failure modes of sandwich panels were significantly dependent on temperature. The stiffness and strength of composite rods and sandwich panels decreased progressively as temperature increased. The decreasing of stiffness and strength at high temperature was mainly attributed to softening of the polymer matrix. The increasing of stiffness and strength at cryogenic temperature was due to reduced mobility of the polymer chains within the resin matrix and the more closely compacted molecules of resin matrix. In order to provide insight into the effect of temperature on failure mechanism, the interface between fiber and matrix was examined using scanning electron microscope, and good interfacial bonding condition was observed at cryogenic temperature. The stiffness and strength of sandwich panels at different temperatures were predicted with proposed method and compared with measured results. Good agreement was observed between the measured values and predictions.
39 citations
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TL;DR: In this article, the response of metal foam sandwich panels (MFSPs) to thermally induced in-plane equibiaxial loading is investigated, and the elastoplastic pre-and postbuckling response of MFSPs is measured and analyzed.
Abstract: Sandwich panels with metal foam cores are studied with application to actively cooled thermal protection systems. To evaluate these panels under thermal loading, a novel experimental technique and load frame, which provide a prominent improvement in the simultaneous preservation of thermal and mechanical boundary conditions during thermomechanical structural testing, are introduced and validated. With this technique, the response of metal foam sandwich panels (MFSPs) to thermally induced in-plane equibiaxial loading is investigated, and the elastoplastic pre- and postbuckling response of MFSPs is measured and analyzed. The in-plane response of the panels is quantified with strain-gauge measurements, and the out-of-plane response across the surface of the panel is captured via shadow moire interferometry. These measurements provide direct visualization and quantification of the initial buckled mode shapes, as well as the evolution of the elastoplastic postbuckled mode shapes from initial buckling into the postbuckling regime. This experimental investigation is the first of its kind, complementing the largely theoretical and numerical body of information on the thermomechanical response of sandwich panels.
39 citations
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TL;DR: In this paper, a metal matrix syntactic foam core sandwich composite was characterized under three-point bending conditions and the average maximum strength, flexural strain and stiffness were measured as 912,±-56,MPa, 049,±−006% and 206,± −07,GPa respectively.
39 citations
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TL;DR: In this paper, the effects of face-sheet thickness and mass allocation on the deformation responses and energy absorption characteristics of aluminum foam core sandwich panels were investigated, and the optimal mass allocation strategies for the reduction of deformation response are to distribute more mass to front face rather than back face, and to adopt a thick and suitable strength foam core.
38 citations