Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 114, Issue -, Pages 117-135Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2018.08.011
Keywords
Fabrics/textiles; Damage mechanics; Braiding; Unit cell
Funding
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/I02946X/1]
- EPSRC [EP/I02946X/1] Funding Source: UKRI
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In this paper, the non-linear mechanical response of triaxial braided composites under multiple loading conditions was investigated with a meso-scale simulation strategy. Numerical predictions made by three-dimensional finite element unit cells with a realistic internal geometry in two nesting configurations correlated well with experimental stress-strain curves and damage mechanisms. Although the investigated braid topologies exhibited considerable geometric variability, the unit cell modelling approach with a compacted geometry model built from average input parameters was capable of correctly predicting the homogenised constitutive response, localisation, and damage evolution. Further, the mechanical response was predicted under variable uni-axial off-axis load cases and the effect of the textile topology on the ultimate strength of the material was investigated. Aside from providing a valuable insight into how damage propagation is affected by the meso-structure, the predicted stress-strain curves can be used to calibrate macroscopic material models suitable for large-scale crash simulations of textile composites.
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