经编间隔织物防刺行为的数值模拟

Numerical simulation of stab-resistant behavior of warp-knitted spacer fabrics

鉴于穿刺过程中力学性能的复杂性,为研究经编间隔织物的防刺机制,利用准静态防刺性能实验观察经编间隔织物的防刺行为和破坏特征,并结合有限元模型模拟了穿刺过程中间隔层结构的变形形态以及穿刺力变化。结果表明:在防刺时经编间隔织物同时有线圈的拉伸变形、剪切变形和间隔层的压缩变形,并分主次抵御刀具的穿刺;模拟计算得到的织物变形特征和穿刺力变化与实验值基本一致,可为设计柔性防刺产品提供参考。

In view of the mechanical complexity of stabbing,the quasi-static stab tests were conducted to observe the stab-resistant behavior and failure characteristic,and the finite element model was built to simulate the deformation shapes of spacer structure and penetration force change to study the stab-resistant mechanism of warp-knitted spacer fabrics.The results showed that the compression deformation of the spacer layer,stretch and shear deformation of loops occurred simultaneously when the warp knitted spacer fabric being stabbed resisted the stabbing in primary and secondary roles.The values of deformation characteristic and penetration force change obtained by simulative computation are basically in agreement with the experimental results,and it provided some reference for the design of soft stab-resistant products.