Tool-Part Interaction Mechanisms Causing ResidualStresses and Distortion During Cure of PolymerMatrix Composites

摘要

Interaction with the tooling can produce residual stresses during the cure ofrnpolymer matrix composite structures which can cause significant distortion.rnExperiments have been carried out showing that substantial stresses may arise duernto small shear stresses at the tool-part interface, or due to the geometry of the partrnlocking it to the tool. Results are presented illustrating a number of mechanismsrnwhereby stress gradients arise that lead to distortion. These include frictionalrneffects before gelation, shear lag after gelation, fibre wrinkling and discontinuitiesrndue to ply drops.