Effect of transverse compression on the residual tensile strength of ultrahigh molecular weight polyethylene(Dyneema~? SK-76) yarns  

作　　者：Karan Shah Subramani Sockalingam 

机构地区：[1]McNAIR Center for Aerospace Innovation and Research,University of South Carolina,SC,USA [2]Department of Mechanical Engineering,University of South Carolina,SC,USA

出　　处：《Defence Technology（防务技术）》2020年第1期35-42,共8页Defence Technology

基　　金：the startup funding provided by the University of South Carolina。

摘　　要：Ballistic impact induces complex stress states on fiber-based armor systems.During impact fibers undergo multiaxial loading which includes axial tension,axial compression,transverse compression,and transverse shear.Transverse co mpression induced by the projectile leads to permanent defo rmation and fibrillation of fibers resulting in degradation of material tensile strength.Previous work(Sockalingam et al.Textile Res.J 2018) has shown a reduction of 20% in the tensile strength of Dyneema~? SK76 single fibers subjectet to 77% nominal transverse compressive strains.Experimental investigation of quasistatic transverse compression on Dyneema~? SK-76 yarns,unconstrained in the lateral direction,indicate an average of 4% reduction in tensile strength of yarns compressed to 77% nominal strains.In this work we use finite element modeling techniques to understand the difference in residual tensile strength between single fibers and yarns observed in laterally unconstrained transverse compression experiments.Finite element study of the transverse compression response of single fibers and yarns indicate that local strains developed in fibers within the yarn are much lower than the local strains developed in single fibers subjected to a given nominal strain and may explain the less reduction in strength observed in yarns.

关 键 词：Polymer fibers Compression TENSILE STRENGTH 

分 类 号：TQ340.1[化学工程—化纤工业]