Journal
COMPOSITES PART B-ENGINEERING
Volume 71, Issue -, Pages 113-121Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2014.11.003
Keywords
Carbon-carbon composites (CCCs); Defects; Damage mechanics; Numerical analysis; Non-destructive testing
Funding
- National Natural Science Foundations of China [11202007, 11232001, 11402132]
- Foundation of Beijing Jiaotong University [KCRC14002536]
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For high performance 3D orthogonal textile Carbon/Carbon (C/C) composites, a key issue is the manufacturing defects, such as micro-cracks and voids. Defects can be substantial perturbations of the ideal architecture of the materials which trigger the failure mechanisms and compromise strength. This study presents comprehensive investigations, including experimental mechanical tests, micron-resolution computed tomography (mu CT) detection and finite element modeling of the defects in the C/C composite. Virtual C/C specimens with void defects were constructed based on mu CT data and a new progressive damage model for the composite was proposed. According to the numerical approach, effects of voids on mechanical performance of the C/C composite were investigated. Failure predictions of the C/C virtual specimens under different void fraction and location were presented. Numerical simulation results showed that voids in fiber yarns had the greatest influences on performance of the C/C composite, especially on tensile strength. (C) 2014 Elsevier Ltd. All rights reserved.
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