Modelling approach for the prediction of stitch influence during woven fabric draping

The following paper focuses on the development of an accurate and efficient modelling approach for the prediction of fibre angles in woven reinforcements resulting from the influence of localised stitching patterns. The modelling procedure involves a process of calibration valid for both dry and wet woven fabric preform materials and has been carried out using the explicit finite element analysis code LS-DYNA. The details and capabilities of the model are discussed and comparisons are made with real fibre angle measurements taken from dry fabric hemispherical dome and three dimensional test shape forming experiments, under the influence of different stitch patterns. The current model demonstrates a high level of functionality allowing accurate prediction of yarn and stitch pattern movement as well as stresses and strains. Full-scale forming simulations for any desired sheet forming scenario can be performed within reasonable timeframes.