S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
Energy-Absorption Mechanisms in Kevlar Multiaxial Warp-Knit Fabric Composites under Impact Loading
- Kang, Tae Jin; Kim, Cheol
- Issue Date
- Composite Science and Technology 2000;60:773-84
- The objectives of this study are to characterize the impact behavior and damage tolerance properties, on the basis of energy
approach, of Kevlar multiaxial warp-knit fabric composites and woven and unidirectional composite laminates. The total impact energy is classi®ed into four categories including delamination energy, membrane energy, bending energy and rebounding energy, and the contributions of each energy absorption mechanism have been evaluated. The membrane and bending energy were calcu-lated from image analysis of the deformed shape of the impacted specimen while the delamination energy was calculated by using the deplying technique.
The multiaxial warp-knit composite showed higher impact fracture toughness and bending properties and this resulted in a bending energy increase and reduced delamination while the membrane and delamination energy were the domi-nant energy-absorption modes for the woven composite laminate.
The delaminated areas in the woven laminates were much larger than those in the multiaxial warp-knit composites, while the delamination energy absorption was slightly higher since the impact fracture toughness of the woven laminate was much smaller than those of the multiaxial warp-knit composites. # 2000 Elsevier Science Ltd. All rights reserved.
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