Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7214456 | Composites Science and Technology | 2018 | 49 Pages |
Abstract
This paper presents an anisotropic, micromechanical damage model for sheet molding compound (SMC) composites, that is a thermoset matrix reinforced with long (â25mm) glass fibers. The model captures the dominant damage mechanisms - matrix damage and fiber-matrix interface debonding - in a Mori-Tanaka homogenization framework. Matrix damage is modeled as a phase-averaged isotropic stiffness degradation. The interface damage is governed by an equivalent interface stress on the lateral fiber surface. Hereby, the inhomogeneous stress distribution in the fiber-matrix interface is taken into account in the definition of the equivalent stress. A Weibull distribution for the interface strength is assumed. The model can account for an anisotropic distribution and evolution of load-carrying fibers with intact interfaces. The model is validated by means of tensile tests on unsaturated polyester polyurethane hybrid and epoxy resin systems with different glass fiber contents (23-50vol.%). The model yields satisfyingly accurate predictions under uniaxial and biaxial stress states.
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Authors
Malte Schemmann, Johannes Görthofer, Thomas Seelig, Andrew Hrymak, Thomas Böhlke,