Journal
COMPOSITES PART B-ENGINEERING
Volume 110, Issue -, Pages 476-486Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2016.11.039
Keywords
Multi-scale method; Stress distribution; 3D braid composite structure; Bending strength
Funding
- National Natural Science Foundation of China [11432005, 11272110, 11302063]
- Science and Technology Innovation Team of Heilongjiang Department of Education [12521102]
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This paper investigates the elastic behavior and failure strength of three-dimensional braided composites by using a multi-scale finite element method. The analyses are performed under the representative unit cell scale and tow architecture scale. The heterogeneous material structure in a RUC is modeled by the multiphase finite element method. Three special element types, called yarn element, matrix element and mixed element, are derived. The correlation between different scales is derived based on the continuum mechanics and homogenization method. Effective modulus of 3D braided composites is predicted solely from the corresponding constituent properties and braided geometrical parameters. The bending strengths are determined by the failure criteria of the components. The predicted results compare favorably with available experimental data. Parametric studies are also performed to examine the effect of braiding angle on the resulting mechanical properties. (C) 2016 Elsevier Ltd. All rights reserved.
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