Parametric study of process-induced warpage in composite laminates

Currently, autoclave processing is the most widely used processing route for manufacturing of composite structures by the aerospace industries. A high quality autoclave cured composite part should have maximum cure, uniform thickness, minimum voids and minimum residual stress and warpage. However, process-induced stress and warpage is one of the major current concerns during autoclave processing of composite structures. Minimization of process-induced warpage through optimal cure cycle requires a good understanding of various mechanisms that contribute to process-induced warpage and of the influence of various process and material parameters. For this purpose a systematic experimental and simulation parametric study, using ANSYS-based process model developed at the UM was pursued. The influence of material parameters (such as tool material and composite material properties), process parameters (such as compaction pressure and dwell temperature), and geometry parameters (such as autoclave heat transfer and laminate thickness) was studied. (Abstract shortened by UMI.)...