Prediction of elastic constants and simulation of stress f ield of 3D braidedcomposites based on the f inite element method
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摘要: 基于考虑纤维束面接触的细观结构模型, 引入周期性位移边界条件, 采用细观有限元方法建立了材料的弹性性能预报模型。模型数值结果与试件实测数据吻合较好, 证明了该模型的合理有效性。经详细分析单胞在典型工况载荷作用下的细观应力分布及变形, 表明模型体现了周期性相邻单胞表面力和位移的连续性, 能获得单胞更为合理的细观应力应变场。Abstract: Based on the microst ructure model established by the authors , coinciding with the actual configuration ofbraided composites , a model to predict the elastic properties was proposed by using the 3D FEM , coupled with theperiodical boundary conditions. The calculated values by the model well agree with the measured values. Numericalresult s verify the effectiveness of the model. The st ress and st rain fields of the model under such typical load casesas tension and shear were analyzed in detail , respectively. The result s indicate that the application of the periodicalboundary conditions guarantees the continuities of the t raction and displacement on the parallel boundary surfaces ofthe cubic model. Therefore , the st ress field and the st rain field obtained by the model are more reasonable than bythe existing FEM models.
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Keywords:
- 3D braiding /
- composites /
- 3D FEM /
- periodical boundary condition /
- mechanical performance
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