Finite Element Modelling of Compaction for Textile Reinforcements Using Automatically Generated Unit Cell Models

This paper describes finite element analysis of compaction for dry textiles during preform manufacture. The models are generated using procedures encompassed in our TexGen textile modeling schema. Meshing and material property allocations are performed automatically, including definition of material orientations for each of the elements. Tow elements are modeled using a transverse isotropic model, incorporating a non-linear transverse stiffness based on measured tow compaction data. The approach is validated for both two-dimensional textiles and is demonstrated for three-dimensional (orthogonal) textiles. In addition to comparison of predicted and measured compaction pressure relationships, the study includes detailed analyses of the evolution in textile architecture during the compaction process. Results provide insights into the effects of textile structure on compaction behaviour, and the ability to study effects of compaction on further properties such as permeability and composite mechanical behaviour.