期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 211, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2021.108830
关键词
3D braided composite; Micro-CT; Trans-scale analysis; Pore defect; Damage failure
资金
- National Natural Science Foundation of China [12072029, 11602020, 51863003]
- National defense Basic research program of China [JCKY2019602D024]
- Shanghai Space Science and Technology Innovation Fund Project [202032041007]
- Laboratory research project of Beijing Institute of Technology [2019BITSYA33]
- Frontier and interdisciplinary innovation projects of Beijing Institute of Technology [2018CX11001]
- Fund of State Key Laboratory for Strength and Vibration of Mechanical Structures [SV2018KF15]
- Beijing Institute of Technology Research Fund Program for Young Scholars
Researchers have developed a trans-scale method coupled with Micro-CT to investigate the strength and damage behavior of 3D braided composites with pore defects. The finite element models established on Micro-CT data accurately predict the stress-strain response and failure modes of the composites. The study also shows the diverse influences of interface properties on yarns and braided composites under different loading conditions.
Pore defects that inevitably produce during the manufacturing process, have distinct effects on the mechanical properties of 3D braided composites. A trans-scale method coupled with Micro-CT is developed to investigate the strength and damage behavior of 3D braided composites with pore defects. Pore defects and yarns are measured by Micro-CT and reconstructed. Then, the trans-scale finite element models are established on the Micro-CT data. The progressive damage model and cohesive-zone model are applied to simulate the damage behavior of braided composites, and effects of interface strength are also investigated. Effective properties of yarns are predicted by the micro-scale analysis and then transferred to conduct the meso-scale analysis. The meso-scale finite element model can predict the stress-strain response well, which has been validated by experiments. The failure modes of yarn damage, matrix cracking and interface debonding are recognized and correspond well with the final failure morphology of the sample. The damage appears around the pore defects and then develops to the weak region in the matrix. The interface properties show diverse influences on yarns and braided composites under different loading conditions. As experimentally demonstrated, the present research scheme can well capture the void features, and therefore efficiently predict the tensile behavior of 3D braided composites considering pore defects.
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