Abstract
In this paper, a progressive damage model reflecting the interaction between delamination and intralaminar crack is developed to predict fracture behaviors and the ultimate load-bearing ability of the fiber-reinforced polymer laminates subject to quasi-static load. Initiation and evolution of intralaminar crack in composites are modeled using a continuum damage mechanics model, which has the capability to reliably predict the discrete crack direction by introducing the crack direction parameter while analyzing the multi-failure of FRP composites. Delamination is modeled using a cohesive zone method with the mixed bilinear law. When the continuum damage model and cohesive zone model are used together, the interactive behavior between multiple failure mechanisms such as delamination induced by matrix cracking often seen in the failure of composite laminates is not generally captured. Interaction between delamination and intralaminar crack in FRP composite structures is investigated in detail and reflected in a finite element analysis in order to eliminate the drawbacks of using both models together. Good agreements between numerical results and experimental data are obtained.
Highlights
Fiber-reinforced polymer (FRP) laminates are widely used in aerospace, automotive, medical components, and sports equipment, due to their advantages
The method of using Continuous damage mechanics (CDM) for the intralaminar failure and using cohesive zone model (CZM) for the interlaminar delamination of composites is still extensively used in the laminated composite damage analysis [48], but it has led to the loss of coupling information for simulating multiple damage modes and results in inaccurate prediction of crack paths [3]
A constitutive model based on the CDM theory, which can consider the propagation path of discrete crack for intralaminar failure, is considered, while CZM with the bilinear law is used for modeling the interlaminar delamination
Summary
Fiber-reinforced polymer (FRP) laminates are widely used in aerospace, automotive, medical components, and sports equipment, due to their advantages. These intra- and inter-laminar failure mechanisms have been treated separately in fracture finite element analysis of composites, but recently, these interactions of multiple damage modes have been studied by several researchers [35]. The method of using CDM for the intralaminar failure and using CZM for the interlaminar delamination of composites is still extensively used in the laminated composite damage analysis [48], but it has led to the loss of coupling information for simulating multiple damage modes and results in inaccurate prediction of crack paths [3]. An effective finite element model based on the coupling of both approaches of CDM and CZM is proposed, which can simulate the progressive damage failure and interaction between damage mechanisms. The progressive damage analysis provides the ultimate strength prediction and multiple failure mechanisms of the composite laminates
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