含缺陷平纹机织复合材料拉伸力学行为数值模拟

Numerical simulation of plain weave composites with defects under unidirectional tension

基于平纹机织复合材料的细观结构单胞模型,考虑其制备过程中产生的孔隙缺陷为随机分布的特征,通过引入两参数Weibull分布函数,应用Python语言实现了ABAQUS的二次开发,并采用Linde等提出的失效准则,建立了含孔隙缺陷平纹机织复合材料的渐进损伤模型,利用有限元数值方法模拟了其拉伸应力-应变行为,针对该模型,讨论了孔隙缺陷对材料拉伸应力-应变行为的影响,并阐述了该平纹机织复合材料单胞模型在经向拉伸载荷作用下其纤维束的损伤及演化过程。结果表明,该模型给出的数值模拟结果与实验数据吻合较好,证明了模型的有效性,为该类材料的优化设计及其力学性能分析提供了一种有效方法。

Based on the meso-structure of plain weave composites, a micromechanical model was presented to simulate the progressive damage behavior of the plain weave composites that subjected to uniaxial tension. By considering the void defects scattered randomly throughout the matrix that induced during the manufacturing process, the Weibull distribution was implemented to simulate the defects by using Python language in the commercial finite element method （FEM） software ABAQUS standard. The failure criteria proposed by Linde was utilized to set up the progressive damage model, and the stress - strain relation of plain weave composites with defects was simulated. The voids in matrix were chosen for analysis the effect on tensile stress - strain curves of plain weave composite. The micromechanical model allows some detailed interpretation of plain weave composite with defects under warp directional tension, such as the evolution of damage fiber bundle. The numerical results show that the proposed model accurately captures the data from experiments, which demonstrates the validity of the present analytical model. Furthermore, the numerical model provides an alternate way to design and predict the mechanical properties of plain weave composites.