【摘要】 为模拟复合材料界面行为,利用界面破坏单元和有限元程序,对金属基复合材料Al基体含Al2O3圆形夹杂的界面破坏行为进行一系列的数值模拟,分别采用切向和法向耦合的界面弹簧单元SPRINGA和由自编的非实体四节点界面单元等模型;比较各种界面模型的差别。由计算结果可知,考虑界面层的计算模型比不考虑界面层时合理;采用破坏型界面层即在界面处加入破坏弹簧或非实体破坏单元的计算模型比仅加入一层实体界面层的计算模型合理;加入破坏型界面层时,界面层力学性质的描述与参数值的给定对计算结果有重要的影响。更多还原

【Abstract】 Interfaces combine all the phases in composites and are transferring the loading between the matrix and reinforcements. Although the volume and size of the interfacial phase are far less than those of other phases, the failure of composite always first arises in the interfacial regions. Therefore the mechanical behavior of interfaces has a strong influence on the mechanical properties such as the strength and the toughness of the materials. So the establishment of the interface models for different composites is very important for more exact and reasonable description of the interface characteristics. An interface element is constructed which doesn’t consider the width of the interphase, but some parameters are embedded to characterize the mechanical behavior of this special interface element which can be used in the numerical simulation for the study of the interface strength and its failure process. The attention is focused on the study of interface damage of an typical geometry of metal matrix composites, the interfacial behavior subjected to mechanical or thermal loads is investigated by using the finite element method with spring elements of damage characteristics. For a circular interface between a cylindrical inclusion and the matrix, the process of deformation, slip and damage near the damage region of interfaces is studied, the tangential and normal coupled spring interface element and one type of non-continuous four-nodes interface element coded by the authors are adopted and compared. The results of numerical simulation are shown that the appropriate determination of the constitutive parameters of the interface is essential for simulating the damage and failure.更多还原