Fabric shear is being considered as the main deformation mode in the thermostamping process of composites. To predict the change of the shear properties of composites during the process, a combined friction and compaction model is developed based on the equilibrium equations of the unit cell of a balanced plainweave glass/polypropylene woven fabric. The advantage of this approach over the earlier models is that it does not require curve fitting of the fabric-level experimental data. In addition, it considers both lateral compaction and friction. Picture frame experimental results are presented to validate this model. A very close correlation is observed between the model predictions and the experimental results. The material stress-strain relationship needed for input to stamping simulations is then calculated using the results of the picture frame model.
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