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A numerical method to evaluate the material properties degradation in composite RVEs due to fiber-matrix debonding and induced matrix cracking

机译:评估纤维基质脱粘和诱发基体开裂导致复合材料RVE材料性能下降的一种数值方法

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摘要

One of the most important issues about the behaviour of composite materials subjected different loading conditions is the initiation and propagation of various damage modes, which have significant effects on their application. In the present study, the cohesive zone model (CZM), as well as extended finite element method (XFEM) are used in the form of a new numerical method to study the effects of initiation and propagation of damage modes including fiber-matrix debonding and matrix cracking in different RVEs extracted from composite plies. To this end, some appropriate assumptions and boundary conditions are used to evaluate the reduced mechanical properties of RVEs. Firstly, CZM is used to model and study the fiber matrix debonding damage. Then by simulating the matrix cracking formation using XFEM, effects of fiber-matrix debonding as well as matrix cracking on the stiffness of composite are studied simultaneously. The precision of the numerical simulation on modelling of the mentioned damage modes is validated by the available numerical researches. The obtained results can be applied to provide the macroscopic constitutive behaviour according to computational homogenization techniques, which is undertaken by the authors.
机译:关于复合材料在不同载荷条件下的性能最重要的问题之一是各种损伤模式的产生和传播,这对其应用有重要影响。在本研究中,以新的数值方法的形式使用了粘聚区模型(CZM)和扩展有限元方法(XFEM),以研究损伤模式的发起和传播,包括纤维基质脱粘和扩散。从复合层中提取的不同RVE中的基体开裂。为此,使用一些适当的假设和边界条件来评估RVE降低的机械性能。首先,CZM用于建模和研究纤维基质的脱胶损伤。然后通过XFEM模拟基体开裂的形成,同时研究了纤维基体的脱粘以及基体开裂对复合材料刚度的影响。现有的数值研究证实了上述损伤模式建模数值模拟的准确性。作者可以采用计算均质化技术将获得的结果用于提供宏观的本构行为。

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