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首页> 外文期刊>Fibers >Role of Inelastic Transverse Compressive Behavior and Multiaxial Loading on the Transverse Impact of Kevlar KM2 Single Fiber
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Role of Inelastic Transverse Compressive Behavior and Multiaxial Loading on the Transverse Impact of Kevlar KM2 Single Fiber

机译：非弹性横向压缩行为和多轴载荷对Kevlar KM2单纤维横向冲击的作用

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摘要

High-velocity transverse impact of ballistic fabrics and yarns by projectiles subject individual fibers to multi-axial dynamic loading. Single-fiber transverse impact experiments with the current state-of-the-art experimental capabilities are challenging due to the associated micron length-scale. Kevlar ? KM2 fibers exhibit a nonlinear inelastic behavior in transverse compression with an elastic limit less than 1.5% strain. The effect of this transverse behavior on a single KM2 fiber subjected to a cylindrical and a fragment-simulating projectile (FSP) transverse impact is studied with a 3D finite element model. The inelastic behavior results in a significant reduction of fiber bounce velocity and projectile-fiber contact forces up to 38% compared to an elastic impact response. The multiaxial stress states during impact including transverse compression, axial tension, axial compression and interlaminar shear are presented at the location of failure. In addition, the models show a strain concentration over a small length in the fiber under the projectile-fiber contact. A failure criterion, based on maximum axial tensile strain accounting for the gage length, strain rate and multiaxial loading degradation effects are applied to predict the single-fiber breaking speed. Results are compared to the elastic response to assess the importance of inelastic material behavior on failure during a transverse impact.
机译：弹丸对弹道织物和纱线的高速横向冲击使单根纤维承受多轴动态载荷。由于相关的微米长度尺度，具有当前最先进的实验能力的单纤维横向冲击实验具有挑战性。凯夫拉尔？ KM2纤维在横向压缩中表现出非线性非弹性行为，其弹性极限小于1.5％应变。使用3D有限元模型研究了这种横向行为对单根KM2纤维受到圆柱形和片段模拟弹丸（FSP）横向冲击的影响。与弹性冲击响应相比，非弹性行为导致纤维弹跳速度和弹丸纤维接触力显着降低达38％。破坏位置显示了冲击过程中的多轴应力状态，包括横向压缩，轴向张力，轴向压缩和层间剪切。此外，模型显示了在弹丸与纤维接触下纤维中的一小段应变集中。基于最大轴向拉伸应变并考虑应变仪长度，应变率和多轴载荷降解效应的失效准则可用于预测单纤维的断裂速度。将结果与弹性响应进行比较，以评估非弹性材料行为对横向冲击破坏的重要性。

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