Anisotropic meanfield modeling of debonding and matrix damage in SMC composites

作者：Schemmann Malte; Goerthofer Johannes; Seelig Thomas; Hrymak Andrew; Boehlke Thomas

来源：Composites Science and Technology, 2018, 161: 143-158.

DOI：10.1016/j.compscitech.2018.03.041

• Polymer-matrix composites (PMCs)
• Multiscale modeling
• Damage mechanics
• Debonding
• Interfacial strength

This paper presents an anisotropic, micromechanical damage model for sheet molding compound (SMC) composites, that is a thermoset matrix reinforced with long (approximate to 25mm) 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.

• 出版日期2018-6-16
• 单位中国地震局工程力学研究所