Abstract
Abstract The article presents the process of modeling delamination of a woven composite material by the finite element method. The models contain a detailed mesostructure in the form of weave geometry. The delamination occurs in the DCB (Double Cantilever Beam) test with the critical energy release rate as a propagation criterion. The methods used, especially Virtual Crack Closure Techniques (VCCT), have allowed us to present the delamination front changes during the propagation. To further investigate the influence of the mesostructure, additional fully homogenous models were analyzed. Load-displacement graphs, typical for DCB tests, are presented. The obtained results show how the presence of detailed geometry of the composite influences the development of damage.
Highlights
One of the most common modes of composites failure is delamination[1,2]
The geometry of the analyzed case and finite element method (FEM) mesh are presented in Figure 1 and Figure 5, respectively
The final displacement assigned to BC1 was different for each of the materials: 3.3 mm for UD230 and 4.5 mm for UD395
Summary
One of the most common modes of composites failure is delamination[1,2]. In laminated composites it occurs when the adhesive bond between the layers fails. Due to its interlaminar occurrence, it is difficult to detect the delamination process and it is even more challenging to determine its further development To model this type of phenomenon, the finite element method (FEM) is commonly used[1,3]. Complex structure and behavior of composite materials are always limiting factors for all numerical methods, including FEM. To counteract these limitations, simplified geometry and isolation of failure modes are used. The VCCT method requires only one critical value – critical energy release rate GIC In this approach bonds between the layers are modeled by pairing the corresponding nodes from different surfaces. ANSYS engineering software was used to perform the FEM analysis
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