Theoretical prediction of stiffness and strength of three-dimensional and four-d

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Theoretical prediction of stiffness and strength of three-dimensional and four-directional braided composites

Based on unit cell model,the 3D 4-directional braided composites can be simplified as unidirectional composites with different local axial coordinate system and the compliance matrix of unidirectional composites can be defined utilizing the bridge model.The total stiffness matrix of braided composites can be obtained by the volume average stiffness of unidirectional composites with different local axial coordinate system and the engineering elastic constants of braided composites were computed further.Based on the iso-strain assumption and the bridge model,the stress distribution of fiber bundle and matrix of different unidirectional composites can be determined and the tensile strength of 3D 4-directional braided composites was predicted by means of the Hoffman's failure criterion for the fiber bundle and Mises' failure criterion for the matrix.水利论文%MOcIFZ0A9Q

作 者: LI Dian-sen LU Zi-xing LU Wen-shu  
作者单位:School of Aeronautics Science and Technology,Beijing University of Aeronautics and Astronautics,Beijing 100083,P.R.China 
刊 名:应用数学和力学(英文版)  EI SCI
英文刊名:APPLIED MATHEMATICS AND MECHANICS 
年,卷(期):2008 29(2) 
分类号:TB332 
关键词:3D braiding   strength   stiffness   mechanical properties   composites  
机标关键词:braided compositesfailure criterioncoordinate systemfiber bundlestress distributionelastic constantsstiffness matrixunit cell modelstrength of 
基金项目:中国航空科学基金,Common Construction Project of Education Committee of Beijing 
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