A computational micromechanics study of the effect of interface decohesion on the mechanical behavior of composites
A computational micromechanics study of the effect of interface decohesion on the mechanical behavior of composites
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DOI：
10.1016/j.actamat.2005.07.013
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发表时间：
2005-10
期刊：
影响因子：
9.4
通讯作者：
J. Segurado;J. Llorca
中科院分区：
文献类型：
--
作者：
J. Segurado;J. Llorca
研究了刚性球形颗粒嵌入韧性基体中随机分布的模型复合材料中界面性质（界面强度和韧性）对拉伸变形的影响。通过对复合材料微观结构的三维代表性体积单元的有限元分析来模拟复合材料的行为，并通过界面单元来包括界面脱粘，该界面单元的行为由内聚裂纹模型来控制。界面脱粘的模式与实验观察结果非常吻合，界面强度和韧性对复合材料拉伸性能（屈服强度，拉伸强度和延展性）的独立影响进行了评估，通过参数研究，在复合材料中均匀和聚集的颗粒分布。此外，使用弹性刚度或体积应变的变化来监测变形期间的损伤的能力被确定。然而，基于这些参数的简单连续损伤力学模型无法预测存在界面脱粘时的复合材料流动应力。
The influence of the interface properties (interface strength and toughness) on the tensile deformation was studied in a model composite made of a random distribution of stiff spherical particles embedded in a ductile matrix. The composite behavior was simulated through the finite element analysis of a three-dimensional representative volume element of the composite microstructure, and interface decohesion was included by means of interface elements whose behavior was governed by a cohesive crack model. The patterns of interface decohesion were in excellent agreement with experimental observations, and the independent effect of both interface strength and toughness on the composite tensile properties (yield strength, tensile strength and ductility) was assessed by a parametrical study in composites with homogeneous and clustered particle distributions. In addition, the ability to use the changes in elastic stiffness or in volumetric strain to monitor damage during deformation was determined. However, simple models of continuum damage mechanics based on these parameters failed to predict the composite flow stress in the presence of interface decohesion.