Characterization and computational modeling of continuous-fiber prepreg ply-ply interaction behavior

Abstract

Ply-ply interaction behavior critically affects wrinkle formation during composite forming. This paper presents a computational model of the ply-ply interaction behavior of woven thermoset prepreg fabrics. The computational model includes visco-elastic, pressure-sensitive adhesion behavior, as well as a yield behavior that allows the deformation to transition from adhesion to friction. The model is based on the analysis and observations of double-lap shear factor effect screening tests and of total slip test measurements. To validate the computational model, finite element simulations are compared to experimental response surface tests for various pressures and deformation rates. The comparison shows that the computational model closely captures the load-deformation response of the ply-ply interaction. This computational model can be used in a forming process simulation to predict wrinkle formations.