论文部分内容阅读
基于伴随能量释放的渐进损伤演化思想,建立了复合材料层合板面内失效分析的连续介质损伤力学(CDM)分析模型,该模型包含损伤表征、损伤起始判定和损伤演化法则3个方面。基于CDM模型,通过引入损伤状态变量表征损伤,建立了平面应力状态下的材料损伤本构模型。采用损伤参量fE改写Hashin准则,以判定损伤的起始。损伤演化由特征长度内的应变能释放密度控制,建立了损伤状态变量关于等效应变的渐进损伤演化法则。模型中还同时考虑了面内剪切非线性和网格敏感性,并进行了对比分析。对含缺口的[90/0/±45]3s和[(±θ)4]s2类典型复合材料层合板的面内拉伸失效进行了分析,结果表明,本文中的模型能有效预测复合材料层合板的面内拉伸强度。
Based on the idea of gradual damage evolution accompanied with energy release, a continuous medium damage mechanics (CDM) analysis model for in-plane failure analysis of composite laminates is established. The model includes three aspects: damage characterization, damage initiation determination and damage evolution rule. Based on the CDM model, the damage damage is characterized by introducing damage state variables, and the material damage constitutive model under plane stress condition is established. Hashin criteria were rewritten using damage parameters fE to determine the onset of injury. The damage evolution is controlled by the density of strain energy release within the characteristic length, and the gradual damage evolution law of the damage state variable about the equivalent strain is established. The model also considers both in-plane shear nonlinearity and grid sensitivity, and makes a comparative analysis. The in-plane tensile failure of [90/0 / ± 45] 3s and [(± θ) 4] s2 composite laminates with notches was analyzed. The results show that the model in this paper can effectively predict the tensile properties of the composites In-plane tensile strength of laminate.