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以修正的经典层合板理论为基础,分析三维编织复合材料的力学性能。在单胞的长度方向积分和平均,预测编织结构复合材料的有效弹性模量;采用蔡-胡多项式失效准则,得到三维编织复合材料的强度性能。另外,进行编织结构复合材料的力学性能实验,探讨纺织工艺参数,如纤维编织角、横向编织角、轴向纱数与编织纱数之比、纤维体积含量等对力学性能的影响,理论预报和试验结果进行对比,发现该力学模型能较好地预报三维编织复合材料的刚度和强度性能。
Based on the modified classical laminate theory, the mechanical properties of three-dimensional braided composites were analyzed. Integrate and average in the length direction of the unit cell to predict the effective elastic modulus of the braided composites. Using the Cai-Hu polynomial failure criteria, the strength properties of the three-dimensional braided composites were obtained. In addition, the mechanical properties of the braided composite were tested, and the influence of the parameters of the textile such as the braiding angle, the braiding angle, the ratio of the axial yarn number to the braided yarn number, the fiber volume content on the mechanical properties were discussed. The experimental results are compared and found that the mechanical model can predict the 3D braided composites stiffness and strength properties.