FRAMEWORK FOR PREDICTING RESIDUAL STRESS IN FILAMENT WOUND CFRP LAMINATE DURING CURE

Accurately predicting cure-induced stresses and deformations in filament wound carbon fiber reinforced polymer (CFRP) laminates is critical for establishing reliable manufacturing processes. To predict residual deformation and stresses in from chemical and thermal effects, neat resin thermo-chemical shrinkage characterization experiments using digital image correlation were carried out. These results were then used in a bi-lamina strip deflection experiments, which were used to calibrate a self-consistent field homogenization model to predict in-situ property development in the resin and lamina accordingly. Analytical solution of bi-lamina strip deflection was adopted to calibrate the material model during the curing process. These predictions were validated against experimental results, showing a close match, particularly in capturing chemical shrinkage and thermo-elastic behavior. This integrated experimental-analytical framework offers significant insights into controlling residual stresses and deformations in filament wound CFRP laminates, facilitating more accurate process optimization and enhanced structural integrity in composite manufacturing.