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Mechanical behavior of silica nanoparticle-impregnated Kevlar fabrics.

机译：二氧化硅纳米粒子浸渍的凯夫拉纤维织物的机械性能。

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摘要

Plain woven Kevlar fabrics are widely used as body protection materials. The present study investigated the impact performance of five styles of Kevlar fabrics K310, K706, K720, K745 and K779 from Hexcel. The fabrics are different in many aspects, i.e., weight per square meter, yarn counts, yarn size, Kevlar fiber type, friction and breaking strength. Silica nanoparticles were impregnated into the fabric to enhance the ballistic impact performance. The fabric impregnated with nanoparticles exhibit significant enhancement in impact performance over their neat counterparts. Fabrics experience large deformation under impact. More or less yarn pull-out was observed on all the fabrics. The in-plane yarn pull-out force has good correlation to the impact performance: fabrics with higher pull-out force performed better in impact tests. A two-dimensional finite element model was proposed to simulate the single yarn pull-out procedure and predict the maximum pull-out force. The most important fabric features are included in this model: yarn count, yarn size, fabric thickness, yarn waviness, fiber modulus, fiber diameter and coefficients of friction et al. The numerical results show good agreement with the experimentally measured pull-out forces. To understand the impact process, a constitutive model was developed to characterize the nonlinear anisotropic properties of the fabric in large deformation. The nanoparticles largely increase the shear stiffness, while only slightly affect the tension behavior along warp and weft yarn directions. This constitutive model was incorporated in the commercial FEA software ABAQUS through the user-defined material subroutine and used to simulate deformations with various loads. Finally the out-of-plane yarn pull-out force was predicted from the in-plane yarn pull-out results using finite element method and the proposed constitutive model.
机译：平纹凯夫拉纤维织物被广泛用作人体防护材料。本研究调查了Hexcel的5种样式的Kevlar织物K310，K706，K720，K745和K779的冲击性能。织物在许多方面是不同的，即每平方米的重量，纱线支数，纱线尺寸，芳纶纤维类型，摩擦和断裂强度。将二氧化硅纳米颗粒浸渍到织物中以增强弹道冲击性能。浸渍了纳米颗粒的织物比其纯净的同类织物在冲击性能上有显着提高。织物在冲击下会发生很大的变形。在所有织物上观察到或多或少的纱线拉出。面内纱线拉出力与冲击性能具有良好的相关性：具有较高拉出力的织物在冲击试验中表现更好。提出了二维有限元模型来模拟单根纱线的拔出过程并预测最大拔出力。该模型包括最重要的织物特征：纱线支数，纱线尺寸，织物厚度，纱线波纹度，纤维模量，纤维直径和摩擦系数等。数值结果表明与实验测得的拔出力有很好的一致性。为了理解冲击过程，开发了本构模型来表征织物在大变形中的非线性各向异性。纳米粒子大大提高了剪切刚度，而仅轻微影响了沿经纱和纬纱方向的拉伸行为。该本构模型通过用户定义的材料子例程并入商业FEA软件ABAQUS中，并用于模拟各种载荷下的变形。最后，利用有限元方法和所提出的本构模型，根据面内纱线的拔出结果预测面外纱线的拔出力。

著录项

  • 作者

    Dong, Zhaoxu.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Engineering Aerospace.;Textile Technology.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 135 p.
  • 总页数 135
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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