Journal
THIN-WALLED STRUCTURES
Volume 160, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2020.107381
Keywords
3D circular braided composite tubes; Manufacturing defects; Braiding angle; Impact compression; Finite element analysis (FEA)
Categories
Funding
- National Natural Science Foundation of China [51805210, 12002248, 52073224]
- Jiaxing Program of Science and Technology [2019AD32005, 2019AD32001]
- Xi'an Polytechnic University [BS201910]
- Natural Science Basic Research Program of Shaanxi [2020JQ-819]
- Scientific Research Program - Shaanxi Provincial Education Department of China [18JS041]
- Thousand Talents Program of Shaanxi Province of China
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This paper numerically investigated the impacts of manufacturing defects and braiding angles on the impact compressive properties of 3D carbon fiber/epoxy resin braided composite tubes. The results show that random defects have a negative influence on the compressive failure mechanisms of the braided tubes, and non-ideal models containing appropriate random defects are more accurate in simulating the dynamic compressive failure evolution process.
This paper numerically investigated the effects of manufacturing defects and braiding angle on the impact compressive properties of three-dimensional (3D) carbon fiber/epoxy resin circular braided composite tubes. Based on the realistic geometrical architecture of 3D tubular braided preform, the full-size microstructural finite element analysis (FEA) models of the braided composite tubes with different braiding angles were established for the axial impact compression behavior at the split Hopkinson pressure bar apparatus. The manufacturing defects including fiber breakages and voids in the resin matrix were generated with Monte Carlo method in fiber tows and resin, respectively. The numerical results show the effects of defects in fiber tows and resin on the compressive strength, initial modulus, and failure strain of the braided composite tubes are both dependent on the braiding angle. The random defects have a negative influence on compressive failure mechanisms of the braided tubes. Comparing the failure morphologies of FEA models with experimental results, we found the non ideal models containing random defects of appropriate content in fiber tows are more accurate than ideal models to simulate the dynamic compressive failure evolution process of 3D braided composite tubes.
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