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Thermoelastic properties of sandwich materials with pin-reinforced foam cores

Science china(Technological Sciences) 2008年第12期51卷 2059-2074页

作者： lu tianjian1,liu tao2,3 & deng zichen2,4 1 moe key laboratory of strength and vibration,school of aerospace,xi’an jiaotong university,xi’an 710049,china 2 Department of Engineering Mechanics,Northwestern Polytechnical university,xi’an 710072,china 3 Department of Engineering,university of Cambridge,Cambridge CB2 1PZ,UK 4 State key laboratory of Structural Analysis of Industrial Equipment,Dalian university of Technology,Dalian 116024,china moe key laboratory of strength and vibration School of Aerospace Xi’an Jiaotong University Xi’an China Department of Engineering Mechanics Northwestern Polytechnical University Xi’an China Department of Engineering University of Cambridge Cambridge UK State key laboratory of Structural Analysis of Industrial Equipment Dalian University of Technology Dalian China

Pin-reinforced foam is a novel type of sandwich core materials formed by inserting pins(trusses) into a foam matrix to create a truss-like network reinforced foam *** loading,the pins deform predominantly by local stretching whilst the deformation of foam is governed by local *** paper presents a theoretical study on the thermoelasticity of pin-reinforced foam sandwich *** calculate the effective thermoelastic properties of pin-reinforced foam cores,the energy-based homogenization approach is employed to develop a micromechanics-based model,calibrated by the existing experimental *** is found that the stiffness of the sandwich core is mainly governed by pin reinforcements:the foam matrix contributes little to sandwich *** with traditional foam cores without pin reinforcements,the changes in inplane thermal expansion coefficients are not vigorous as a result of pin reinforcements,while the through-thickness thermal expansion coefficient changes *** is also demonstrated that it is possible to design materials with zero or negative thermal expansion coefficients under such a context.

关键词： sandwich panel pin reinforcement analytical solutions homogenization thermoelasticity thermal expansion

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