Void defects have appeared inevitably during the manufacturing process of braided composites, which directly affect the mechanical properties and strength of braided composites. First, the influence of internal void and porosity on the mechanical properties of resin was predicted. Second, the evolution in the mechanical properties of three dimensional (3D) braided composites was obtained using the Mori-Tanaka method. Finally, the strength prediction, failure mode, stress and strain field of 3D braided composites with void defects were investigated by means of finite element simulation based on the progressive damage theory in ABAQUS, which will compare the simulation results with the theoretical results and other scholar's experiments. The innovation of this work is to establish the constitutive model and finite element model of 3D braided composite material with voids and predict the evolution of the mechanical properties of 3D braided composite material with defects. The results will provide the theoretical and design basis for evaluating the influence of void defects on the mechanical properties of 3D braided composites.

在编织复合材料的制造过程中不可避免地出现空隙缺陷，这直接影响编织复合材料的机械性能和强度。首先，预测内部空隙和孔隙率对树脂力学性能的影响。其次，使用Mori-Tanaka方法获得了三维（3D）编织复合材料力学性能的变化。最后，利用基于ABAQUS的渐进损伤理论的有限元模拟，研究了具有空缺缺陷的3D编织复合材料的强度预测，破坏模式，应力和应变场，并将模拟结果与理论结果和其他学者的研究进行了比较。实验。这项工作的创新之处在于建立具有空隙的3D编织复合材料的本构模型和有限元模型，并预测具有缺陷的3D编织复合材料的力学性能的演变。研究结果将为评估空隙缺陷对3D编织复合材料力学性能的影响提供理论和设计依据。