Abstract

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 (≈25 mm) 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.

Highlights

  • Sheet molding compound (SMC) composites receive increasing attention in industrial applications due to their high geometric freedom and low cycle times in manufacturing processes

  • According to [1] the sheet molding compound (SMC) composite is considered a two‐phase composite consisting of a matrix phase with volume fraction and glass fibers with volume fraction

  • The microscopic orientation of fibers within the composite can be specified by an empirical representation of the fiber orientation distribution function (FODF) which is defined as are, so to speak, the volume fractions of fibers oriented in direction with

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Summary

Introduction

Sheet molding compound (SMC) composites receive increasing attention in industrial applications due to their high geometric freedom and low cycle times in manufacturing processes. In order to apply SMC composites, possibly locally reinforced with continuous fiber reinforced composites, as structural components, their mechanical and especially damage behavior must be examined and understood. Meraghni and Benzeggagh [2] and others [3,4,5], e.g., investigated damage propagation in randomly oriented, discontinuous fiber reinforced composites. E.g., Ju and Lee [14,15] consider fibers with damaged interfaces as either matrix material or voids. The Weibull based interface characterization comes with only three independent parameters. In this contribution the interface parameters and their influence on the damage evolution and overall stress‐strain relation are studied

Fundamentals
Effective Behavior
Matrix Damage
Fiber‐Matrix Interface Debonding
Fiber‐Matrix Interface Parameters
Variation of
Conclusions
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