ISOTROPIC RESIDUAL STRESSES IN THERMOSETTING RESINS: MODELING AND THE EFFECTS OF RESIN MODIFICATION PROPERITIES

摘要

Recently, we extended a thermo-viscoelastic model to describe the development of isotropic residual stresses for a commercial thermosetting material during cure. In this paper, we extend this model to study residual stresses in novel thermosetting resin systems, such as spiro orthocarbonate/bismaleimide (SOC/BMI) which are under consideration by the Air Force for use as polymer matrix composites. In these systems, cure shrinkage and isotropic residual stresses are reduced through a ring-opening reaction which occurs independently of the addition reaction. The modeling effort includes a parametric analysis of the effects of various parameters, including the volume changes involved in the reactions, the relative rates and orders of the reactions, and the dependence of the glass transition on the network formed.