织物顶出测试中纱线应力传递模型的拉曼研究

弹头侵彻织物过程中的载荷传递是冲击能量耗散的重要途径,有必要从细观尺度上研究纱线上的应力传递行为。本文使用微拉曼光谱法测量了织物离面顶出测试中的纱线应力分布,建立了相应的纱线应力传递模型。针对周边固支的Kevlar 49芳纶纤维平纹织物受中心加载实验,拉曼测试显示出织物存在十字形的高应力分布,主纱是载荷传递的主要路径,辅纱是传递主纱载荷的次要路径,理论模型预测的纱线应力分布符合实验测量趋势。上述工作有利于进一步探讨柔性防弹织物的能量吸收机制。

Raman study on yarn stress transfer model in fabric pushout test

It is necessary to study the stress transfer behavior of yarn at the mesoscale scale as the load transfer during the process of bullet penetrating fabric is an important way of impact energy dissipation. In this work, the yarn stress distribution of fabric in the out-of-plane pushout test is measured by the micro-Raman spectroscopy, and the corresponding yarn stress transfer model is established. The Raman tests show that when the plain fabric of Kevlar 49 aramid fiber with fixed surrounding boundaries is loaded at the center, a high-stress cross-shaped distribution can be found in the fabric. The primary yarns bear the main load transfer, and the secondary yarns are the branches for load transfer, which can transfer the load from the primary yarns. The yarn stress distribution predicted by the proposed theoretical model conforms to the tendency in experiments.This work is beneficial to the further discussion on the energy absorption mechanism of flexible bulletproof fabric.