弱界面粘结对复合材料有效性能的影响

采用非线性弹簧元模拟界面,用细观力学有限元法计算分析了不同界面特性下弱界面粘结的纤维增强金属基复合材料的宏细观性能。并考虑了3种不同的界面模型。结果表明弱界面粘结的存在使复合材料宏观性能下降。在常响应界面情况下,复合材料横向拉伸应力-应变曲线存在明显的转折点,对应于界面分离的起始点,转折点的位置取决于界面粘结强度。当存在渐进适应界面时,复合材料横向拉伸应力-应变曲线存在3个阶段。

Composite Mechanical Behavior with Weak Interfacial Bonding

The micromechanical finite element method and the nonlinear spring element for the interface were employed to predict the effective behavior of MMCs.The results indicate that weak interfacial bonding reduces the macro mechanical properties of MMCs.A weak interfacial bonding reduces the elastic modulus of MMCs.The Constant Compliant Interface(CCI) model included a finite interfacial strength for the interface.The stress-strain curve under transverse loading of MMCs has a corner point,associated with the initiation of interfacial de-bonding,which is determined by the interfacial bonding strength.The Evolving Complaint Interface(ECI) model allows unloading of interfacial stresses.The transverse loading stress-strain curve exists three-stage deformation process.