Kinematic and mechanical response of dry woven fabrics in through-thickness compression
Virtual fiber modeling with mesh overlay technique and experimental validation
Lode Daelemans (Universiteit Gent)
Brecht Tomme (Universiteit Gent)
B. Caglar (TU Delft - Aerospace Manufacturing Technologies, École Polytechnique Fédérale de Lausanne)
V. Michaud (École Polytechnique Fédérale de Lausanne)
Jeroen Van Stappen (Universiteit Gent)
V. Cnudde (Universiteit Utrecht, Universiteit Gent)
Matthieu Boone (Universiteit Gent)
Wim Van Paepegem (Universiteit Gent)
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Abstract
The through-thickness compressive behavior of fabric reinforcements is crucial in liquid composite molding manufacturing processes. Predictive simulations of the compressive response are thus necessary to enable a virtual processing workflow. These are complex however, as the compressive behavior of the reinforcement fabrics is non-linear. Altough virtual fiber modeling has proven to be a strong kinematical tool, it cannot predict the compressive response due to the lack of bending stiffness in the virtual fibers. Here, we describe a solution that enables predictive compressive simulations through hybrid virtual fibers. It is based on an overlay mesh-element technique, combining both (i) finite elements that determine the in-plane fiber properties as well as (ii) finite elements that determine out-of-plane fiber bending. Using these hybrid virtual fibers, the through-thickness compression of a twill woven fabric ply is simulated and experimentally validated using both μCT-based as compliance-based measurements. Excellent agreement between simulation and experiment is obtained for the right set of input parameters.
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