Modified Halpin–Tsai equation for predicting interfacial effect in water diffusion process

Abstract Interfacial degradation is the main reason for deterioration of mechanical properties composites in hydrothermal environments. In this study, effect interphase on water diffusion two types unidirectional continuous carbon fiber-reinforced polyamide 6 (CF/PA6) investigated through experimental measurements, theoretical analysis, and numerical simulation. The moisture coefficient composite at different environmental temperatures characterized by immersion tests analyzing barrier accelerating effects layer. Based results, three-phase Halpin–Tsai model derived validated, then critical diffusivity obtained to quantify interfacial during process. To further validate present model, stable transient finite element models are developed. It found that CF/PA6 system 7.31 times higher than matrix.