摩擦力对织物防弹性能影响的有限元分析(英文)

FE analysis of the effect of friction on ballistic impact performance of woven fabrics

纱线之间的摩擦力对织物的防弹性能有很大影响,但是始终缺少对失效机制了解.例如,多大的摩擦力有利于织物吸收能量,纱线间的摩擦力对应力分布的影响等.本文采用有限元分析的方法对摩擦力影响的机理进行了系统的研究,采用ABAQUS建立织物的有限元分析模型.研究表明,织物的防弹性能随纱线之间摩擦力的增大而增加.应力在纱线上的分布随摩擦力的变化而改变.增大摩擦力能减少接触区边缘的应力.因此,摩擦力较大的织物需要更多的时间才能被穿透,这将有助于吸收更多的能量.研究还表明摩擦力的增加会导致纵向波速下降,能量吸收会因此而减少.但是,增加摩擦力会产生较大的横向波,能量吸收会因此而增加.

Many attempts have been done to investigate the effect of friction on ballistic impact response of woven fabrics. It has been shown that friction plays an important roIe in determi- ning the ballistic impact performance of fabrics. Currently, there is little fundamental under- standing of impact failure mechanisms in woven fabrics. For example, what levels of inter-yarn friction are beneficial to energy absorption capacity of the fabrics, how friction affects the stress distributions which are crucial important in determining the failure modes of yarns and energy absorption. In this paper, a detailed study using finite element analysis has been carried out. The purpose of the paper is to study numerically the way in which friction affects the im- pact behaviour of ballistic fabrics and to determine the distribution and magnitude of the stres- ses. The finite element model was created using ABAQUS to simulate the transverse impact onto woven fabrics. The calculated results show that the ballistic impact performance of woven fabrics increa- ses with increasing levels of friction. The stress distributions on the yarns are sensitive to the change of friction between the yarns. Increasing friction between the yarns decreases the stres- ses at the edge of the contact area. Therefore, the fabric with large friction between the yarns needs longer time to penetrate the yarns relative to the fabric with small friction between the yarns. This will contribute to the increase of energy absorption of the fabric. However, in- creasing friction between the yarns decreases longitudinal wave velocities and this may reduce energy absorption of the fabric. In addition, increasing friction between the yarns increases transverse wave velocities which is beneficial to energy absorption of the fabrics.