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通过对三维四向碳/环氧编织复合材料的拉伸实验,观测了不同几何尺寸的试件的破坏模式和断口形貌,得到了材料在拉伸载荷下不同的破坏机理以及材料的力学性能与试件几何尺寸的相关性,研究表明材料随着内部单胞数量的增加材料的弹性模量递减,而剪切模量和泊松比递增的变化规律,通过体积平均法从理论上预报了材料的弹性性能,预报结果与实验结果相符,实验和理论所获结论为进一步进行材料的刚度和强度预报以及强度准则的建立奠定了必要的实验和理论基础.
Through the tensile test of the three-dimensional four-direction carbon / epoxy braided composites, the failure modes and the fracture morphology of the specimens with different geometrical dimensions were observed, and the different failure mechanisms under tensile load and the mechanical properties of the materials The results show that with the increase of internal unit cell, the elastic modulus of the material decreases, while the change of shear modulus and Poisson’s ratio increase. The volume average method is used to predict the material The results of the prediction are in good agreement with the experimental ones. The conclusions drawn from the experiments and theories have provided the necessary experimental and theoretical basis for the further prediction of the stiffness and strength of materials and the establishment of the strength criterion.