Journal
COMPOSITES PART B-ENGINEERING
Volume 77, Issue -, Pages 379-390Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2015.03.002
Keywords
3-Dimensional reinforcement; Impact behavior; Damage mechanics; Braiding
Funding
- National Science Foundation of China [11272087]
- Foundation for the Fok Ying-Tong Education Foundation [141070]
- Keygrant Project of Chinese Ministry of Education [113027A]
- Fundamental Research Funds for the Central Universities of China
- Chinese Universities Scientific Fund [CUSF-DH-D-2014002]
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This paper reports the high-strain rate properties of 3-D braided basalt/epoxy composite materials at 26 degrees C, -50 degrees C, -100 degrees C and -140 degrees C with strain-rate range from 1300 s(-1) to 2100 s(-1) by experimental study. A simple and effective cryogenic device was applied to the SHPB system to create the low-temperature field of the samples. It was found that the compression modulus, peak stress, failure strain and specific energy absorption of the 3-D braided basalt/epoxy composite materials had different sensitivity to temperatures and strain rates. In the out-of-plane impact, there were two failure modes, namely, compression-failure mode and shear-failure mode. Fracture of fiber tows was irregular with abundant pull-out of fiber and much finely-divided fragmentation of resin among fibers at room temperature. In cryogenic field, the fracture of fiber tows was neat and tidy with few pull-out of fiber and few finely-divided fragmentation of resin. However, in the in-plane impact, there was only compression failure mode. And there was no fracture of fiber tows and no big difference among samples tested under different gas pressures. Because of the function of squeezing and buckling, split-off separation of the composite could be blocked by the tangled fiber tows. As a whole, the reinforcement could still keep its structural integrity. (C) 2015 Elsevier Ltd. All rights reserved.
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