期刊
COMPOSITES PART B-ENGINEERING
卷 42, 期 2, 页码 309-317出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2010.11.011
关键词
3-Dimensional reinforcement; Impact behavior; Mechanical testing; Braiding
资金
- National Natural Science Foundation of China [10902058]
- China Postdoctoral Science Foundation [20090450408, 201003122]
- Key Laboratory Foundation of Textile Science & Technology of Ministry of Education, Donghua University [KF0904]
The quasi-static and high-strain-rate compressive experiments were performed on the three dimensional (3D) five-directional carbon/phenolic braided composites with different braiding parameters in the transverse direction. Transverse compressive properties at high strain rates from 500/s to 1500/s were tested using the split Hopkinson pressure bar (SHPB) technique. The dynamic stress vs. strain curves and important mechanical properties such as peak stress, modulus and failure strain were determined. Macro-fracture morphology and the scanning electron microscope (SEM) micrographs were examined to understand the deformation and failure mechanism of composites. The results show the stress vs. strain curves exhibit obvious non-linear characteristics and a marked softening phenomenon. The composites show clearly the strain rate strengthening effects and dynamic toughness phenomenon. The damage and failure patterns of composites vary with high strain rates. Moreover, the transverse dynamic compressive properties and failure mechanism can be significantly affected by the braiding angle and the fiber volume fraction. (C) 2010 Elsevier Ltd. All rights reserved.
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