Affiliation:
1. College of Textiles, Key Laboratory of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai, China
Abstract
This investigation aims to study the impact behaviors of biaxial warp-knitted composite materials under the following conditions—strain rates of 1000–3400 s−1; temperatures of 23℃–210℃. Impact compression tests (in the through-thickness direction of specimens) were conducted using the split Hopkinson pressure bar apparatus. A heating device was applied to achieve required temperatures. It was found that high temperatures of 120℃–210℃ led to a softened initial response on the composite’s stress–strain curves. In addition, pre-peak hardening was observed in the specimen when exposed to temperature between 23℃ and 90℃. The latter could be attributed to further compaction with densification effect during through-thickness compression. Finally, two different failure modes were noticed—(1) the shear-oriented failure and (2) the delamination-oriented failure. This was due to the degradation of the tricot, the brittle–ductile transition of the resin, and the thermal stress in the biaxial warp-knitted composite at different temperatures.
Subject
Materials Chemistry,Polymers and Plastics,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites
Cited by
3 articles.
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