A coupled multi-scale method for predicting the viscoelastic behavior of resin-based 3D braided composites. (October 2020)

• Record Type: Journal Article
• Authors: Zhai, Jun-jun; Kong, Xiang-xia; Cheng, Su; Wang, Xiao-hong; Cheng, Hai-ming
• Is Part Of: Materials & design. Volume 195(2020)
• Publication Date: 2020-10
• Subjects: 3D braided composites -- Multi-scale approach -- Viscoelastic behavior -- Stress relaxation; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2020.109048
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: A new alternative multi-scale calculation procedure was presented to characterize the time-dependent viscoelastic behaviors of resin-based three dimensional (3D) braided composites. The present investigation was processed based on micro-scale fiber/resin, meso-scale yarn/resin and macro-scale homogeneous composite. Integrating with the asymptotic expansion homogenization (AEH) method, the multi-scale physical fields in the three-scales is established, and the multi-phase finite element (MFE) method is adopted to overcome the difficulty in discretization for the heterogeneous structural models. The time-dependent stress relaxation responses under three-scales were particularly investigated by the coupling MFE-AEH multi-scale method. The time-dependent effective viscoelastic properties in the micro-sclae and meso-scale were also calculated by utilizing the Prony Series fitting to simplify the inverse Laplace transform. The accuracy and reliability are validated by the corresponding experimental and numerical results, the effects of braided angle and relaxation time on the viscoelastic properties of 3D braided composites were studied, respectively. Graphical abstract: Unlabelled Image Highlights: Viscoelastic behaviors of 3D braided composites at various scales were predicted innovatively by a coupled multiscale method. Both the relaxation modulus and stress relaxation behaviors show short relaxation stage and long steady-state stage. Stress distributions in meso/micro-scale show obvious inhomogeneity, the stiffer than resin the more obvious the variations. The smaller braided angle the better relaxation resistance abilities for viscoelastic properties of 3D braided composites.