Abstract Warp-knitted spacer fabrics (WKSFs) that have been recognized as one of the most promising materials are extensively applied in aerospace, military, construction, transportation and other fields owing to unique sandwich structure and excellent performance. In this paper, the compressive and low-velocity impact properties of three kinds of WKSFs with multi-layers have been evaluated. In flat plate compression test, compression process could be divided into three stages: linear compressive stage, yield stage and crushing stage. There is an obvious discrepancy among three kinds of WKSFs in the yield stage due to the varying layers. The fluctuation becomes more frequent with the increase of the number of layers, and the elastic modulus of WKSF with three layers is the largest. In fatigue-resistance compression test, the compressive trend of three kinds of WKSFs is coherent. The spacer monofilaments show a certain fatigue, resulting in a lodging phenomenon. In addition, WKSF with five layers has the best fatigue resistance. In low-velocity impact test, only the uppermost layer of three kinds of WKSFs is damaged due to their unique structure. WKSF with two layers absorbs more energy and has the best low-velocity impact resistance.

中文翻译：

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多层经编间隔织物的压缩特性

摘要 经编间隔织物(WKSFs)以其独特的夹层结构和优异的性能被广泛应用于航空航天、军事、建筑、交通等领域，被认为是最有前途的材料之一。本文评估了三种多层WKSFs的压缩和低速冲击性能。在平板压缩试验中，压缩过程可分为三个阶段：线性压缩阶段、屈服阶段和破碎阶段。由于层数不同，三种WKSFs在屈服阶段存在明显差异。随着层数的增加，波动变得更加频繁，其中三层WKSF的弹性模量最大。在抗疲劳压缩试验中，三种 WKSF 的压缩趋势是一致的。间隔单丝表现出一定的疲劳，产生倒伏现象。此外，五层的WKSF具有最好的抗疲劳性。在低速冲击试验中，三种WKSFs由于其独特的结构，只有最上层受到破坏。具有两层的 WKSF 吸收更多的能量并具有最佳的低速抗冲击性。