Numerical evaluation of the influence of porosity on bending properties of 2D carbon/carbon composites

Chao, Xujiang and Qi, Lehua and Tian, Wenlong and Hou, Xianghui and Ma, WenJing and Li, Hejun (2018) Numerical evaluation of the influence of porosity on bending properties of 2D carbon/carbon composites. Composites Part B: Engineering, 136 . pp. 72-80. ISSN 1359-8368

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Numerical simulation with progressive damage criterion is implemented to investigate the effect of porosity on the bending properties of 2D cross-ply carbon/carbon (C/C) composites. The mechanical properties of Pyrocarbon matrix regarding the change of porosity are calculated by using Mori-Tanaka approach. Combining with the stiffness degradation scheme, the ultimate bending strengths are calculated in Abaqus though a user-defined subroutine (USDFLD). Delamination is modelled by inserting cohesive elements between two adjacent plies. A good agreement is obtained when the FEM results are compared to three-point bending experiments. The FEM results show that the bending strength decreases greatly with the increase of porosity. When the porosity reaches up to 18%, the bending strength is decreased by 57%. The major fracture behaviors are interlamination delamination and continuous crack damage in 90° plies. With the increase of porosity, more severe interlamination delamination will be slightly aggravated. In addition, the increase of porosity will also accelerate the damage in 90° plies.

Item Type: Article
Keywords: 2D C/C composites, Numerical simulation, Flexural properties Progressive damage
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: 10.1016/j.compositesb.2017.10.027
Depositing User: Eprints, Support
Date Deposited: 03 Jan 2018 09:33
Last Modified: 03 Jan 2018 09:34

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