Experimental and numerical research on the nonlinear creep response of polymeric composites under humid environments. (1st November 2020)

• Record Type: Journal Article
• Authors: Sun, Tongsheng; Yu, Cungui; Yang, Wenchao; Zhong, Jianlin; Xu, Qiang
• Is Part Of: Composite structures. Volume 251(2020)
• Publication Date: 2020-11-01
• Subjects: Polymeric composites (PMCs) -- Moisture absorption -- Non-linear creep -- Fully coupled modelling -- Finite element analysis; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2020.112673
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: The aim of this work is to study the nonlinear creep response of polymeric composites under humid environments. A three-dimensional orthotropic nonlinear creep constitutive model that considers the moisture effect is derived by introducing the moisture shift factor into Schapery's nonlinear equation. Hygrothermal-mechanical coupling moisture absorption tests, as well as static mechanical property tests and short-term tensile creep-recovery tests with different moisture contents were performed to obtain the hygroscopic parameters and the moisture and stress dependent nonlinear creep parameters. A fully coupled numerical prediction model was developed in Abaqus with a user-defined material subroutine (UMAT) and user-defined field variable subroutine (USDFLD) to simulate the coupled diffusion-nonlinear creep behaviour. Good agreement was observed between the numerical and experimental results.