Energy-absorption mechanisms in Kevlar multiaxial warp-knit fabric composites under impact loading
Energy-absorption mechanisms in Kevlar multiaxial warp-knit fabric composites under impact loading
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DOI：
10.1016/s0266-3538(99)00185-2
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发表时间：
2000-01-01
影响因子：
9.1
通讯作者：
Kim, C
中科院分区：
文献类型：
--
作者：
Kang, TJ;Kim, C
本研究的目的是表征的冲击行为和损伤容限性能，能量方法的基础上，芳纶多轴向经编织物复合材料和机织和单向复合材料层压板。将冲击能量分为脱层能量、薄膜能量、弯曲能量和回弹能量4类，并对各能量吸收机制的贡献进行了评价。薄膜能和弯曲能由冲击试样变形形状的图像分析计算，而分层能则由拉伸技术计算。多轴向经编复合材料表现出较高的冲击断裂韧性和弯曲性能，这导致在弯曲能量增加，减少分层，而膜和分层能量的编织复合材料层压板的主要能量吸收模式。机织层合板的脱层面积远大于多轴向经编复合材料的脱层面积，而由于机织层合板的冲击断裂韧性远小于多轴向经编复合材料的冲击断裂韧性，脱层能量吸收略高。(C)2000爱思唯尔科技有限公司版权所有。
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 classified 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 calculated 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 dominant 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. (C) 2000 Elsevier Science Ltd. All rights reserved.