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307 Sensitivity analysis of fiber-matrix interface parameters in an SMC composite damage model
* 1 , 1 , 2 , 3 , 1
1  Institute of Engineering Mechanics, Chair for Continuum Mechanics, Karlsruhe Institute of Technology (KIT), Kaiserstraße 10, Germany
2  Institute of Mechanics, Departement of Civil Engineering, Geo and Environmental Sciences, Karlsruhe Institute of Technology (KIT), Otto-Ammann-Platz 9, Germany
3  Department of Chemical and Biochemical Engineering, Western University (UWO), 1151 Richmond St. N., London (ON), Canada


This contribution shortly introduces the anisotropic, micromechanical damage model for sheet molding compound (SMC) composites presented in the authors’ previous publication [1]. As the considered material is a thermoset matrix reinforced with long (≈ 25mm) glass fibers, the leading damage mechanisms are matrix micro-cracking and fiber-matrix interface debonding. Those mechanisms are modeled on the microscale and within a Mori-Tanaka homogenization framework. The model can account for arbitrary fiber orientation distributions. Matrix damage is considered as an isotropic stiffness degradation. Interface debonding is modeled via a Weibull interface strength distribution and the inhomogeneous stress distribution on the lateral fiber surface. Hereby, three independent parameters are introduced, that describe the interface strength and damage behavior, respectively. Due to the high non-linearity of the model, the influence of these parameters is not entirely clear. Therefore, the focus of this contribution lies on the variation and discussion of the above mentioned interface parameters.

Keywords: sheet molding compound (SMC) composites; multiscale modeling; damage; interface characterization