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

Interfacial degradation is the main reason for deterioration of mechanical properties of composites in hydrothermal environments. In this study, the effect of the interphase on water diffusion in two types of unidirectional continuous carbon fiber-reinforced polyamide 6 (CF/PA6) composites is invest...

Full description

Saved in:
Bibliographic Details
Published in:Science and engineering of composite materials 2021-04, Vol.28 (1), p.180-189
Main Authors: Lei, Yongpeng, Luo, Ling, Kang, Zhenhang, Zhang, Jifeng, Zhang, Boming
Format: Article
Language:English
Subjects:
Carbon fiber reinforced plastics
continuous carbon fiber reinforced-polyamide 6 composites
Diffusion coefficient
Diffusion effects
Diffusivity
Fiber composites
Fiber reinforced polymers
Finite element method
Halpin–Tsai model
interfacial effect
Mathematical analysis
Mathematical models
Mechanical properties
Moisture
Polyamide resins
Polymer matrix composites
water diffusion
Water immersion
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Interfacial degradation is the main reason for deterioration of mechanical properties of composites in hydrothermal environments. In this study, the effect of the interphase on water diffusion in two types of unidirectional continuous carbon fiber-reinforced polyamide 6 (CF/PA6) composites is investigated through experimental measurements, theoretical analysis, and numerical simulation. The moisture diffusion coefficient of composite at different environmental temperatures is characterized by water immersion tests for analyzing the barrier and accelerating effects of the interphase layer. Based on the experimental results, the three-phase Halpin–Tsai model is derived and validated, and then the critical diffusivity is obtained to quantify the interfacial effect during the diffusion process. To further validate the present three-phase Halpin–Tsai model, the stable and transient finite element models of moisture diffusion are developed. It is found that the critical diffusivity coefficient of the interphase for the CF/PA6 composite system is 7.31 times higher than that of the matrix.
ISSN:0792-1233
2191-0359
DOI:10.1515/secm-2021-0017