Open AccessPrediction of creep performance during long-term storage of composite directors based on nonlinear viscoelasticity
Author(s) -
Tongsheng Sun,
Cheng Yu,
Q. Wang,
Wenchao Yang,
Jiehua Zhong
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1507/6/062003
Subject(s) - creep , materials science , viscoelasticity , superposition principle , composite number , composite material , structural engineering , term (time) , nonlinear system , stress (linguistics) , engineering , mathematics , mathematical analysis , physics , linguistics , philosophy , quantum mechanics
In order to investigate the long-term storage creep performance of composite directors for multiple launch rocket systems, E-glass fiber reinforced epoxy matrix composite laminates were prepared and the 60/60-minute creep/creep-recovery tests were carried out at different stress levels. The master curves of long-term creep compliance were obtained by shifting the short-term creep compliance based on the superposition principle, and then the parameters of linear-transient creep compliance model were obtained by a curve fitting procedure. The functional relation between the Schapery’s nonlinear parameters and the average matrix octahedral shear stress was developed by an analytical procedure. Finite element method and the user-defined material subroutine (UMAT) are used to establish the long-term storage numerical analysis model of composite directors, and the creep deformation after 15-years stacking storage was predicted.