A general numerical tool based on ABAQUS to predict shape distortions and residual stresses have been developed. To validate the simulation tool three thick walled angle brackets were manufactured under non-isothermal conditions. Predicted temperatures, degree of cure and shape distortions were then compared with the experimental values for the thick walled angle brackets. Predicted and experimental values show good agreement. Curing of a composite involves thermal expansion, chemical shrinkage and a severe change in the mechanical properties when the resin transforms from a liquid via a rubber like solid into glassy solid as well as heat generation from the cross linking reaction. In other words curing a composite is a quite complex thermal-chemical-mechanical process, which cause challenges in form of residual stresses and sahped distortions. For that reason, there is an interest to use simulation tools to forecast problems owing to residual stresses and/or shape distortions. The mechanical behavior of a thermoset polymer during cure is visoelastic and rather complicated to model accurately for c composite and anisotropic viscoelastic models demands extensive material characterisation, long calculation times and requires large memory for storage of internal state variables.