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提出了一种基于周期性代表性单元(RVE)的细观模型,用于预测粘聚区模型的强度参数,以提高基于粘聚区模型的有限元法模拟复合材料分层的精度.模型从复合材料的细观结构出发,采用最大主应力准则判断粘聚层的初始裂纹的萌生,从而建立了粘聚强度与基体强度的关系;并以宏观正交各向异性为假设条件,确定了RVE的周期性位移边界条件.用该模型预测了AS4/PEEK和T700/QY8911层合板不同铺层间的粘聚强度.采用所预测的粘聚强度值对混合模式弯曲(MMB)和六点弯曲试验进行了仿真,仿真结果与实验值具有较好的一致性.
A meso-scale model based on Periodic Representation Unit (RVE) is proposed to predict the strength parameters of cohesive zone model to improve the precision of the composite layered model based on cohesive zone model. Based on the mesostructure of composite materials, the maximum principal stress criterion is used to determine the initiation of initial crack in the cohesive layer, and the relationship between cohesive strength and matrix strength is established. Based on the assumption of macroscopic orthogonal anisotropy, RVE The model was used to predict the cohesive strength between different lay-up layers of AS4 / PEEK and T700 / QY8911 laminates.The mixed mode bending (MMB) and six-point bending tests The simulation results show that the simulation results are in good agreement with the experimental ones.