The effect of fiber meso/nanostructure on the transverse compression response of ballistic fibers

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• 作者：Preston B. McDaniel^a ; ^b ; ^{preston@udel.edu} ; Subramani Sockalingam^a ; ^c ; Joseph M. Deitzel^a ; John W. Gillespie Jr.^a ; ^b ; ^c ; ^d ; Michael Keefe^a ; ^b ; Travis A. Bogetti^e ; Daniel T. Casem^e ; Tusit Weerasooriya^e
• 关键词：Polymer (textile) fibers ; Nano-structures ; Mechanical testing ; Finite element analysis (FEA)
• 刊名：Composites Part A: Applied Science and Manufacturing
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：94
• 期：Complete
• 页码：133-145
• 全文大小：4387 K
• 卷排序：94

文摘

The goal of this research is to understand the effect of fiber meso/nanostructure on the macroscopic quasi-static transverse compression response of ultra-high molecular weight polyethylene (UHMWPE) Dyneema SK76 fibers. These fibers exhibit nonlinear inelastic behavior with a small elastic limit and negligible elastic recovery upon unloading. Finite element model predictions of the experiment, using a continuum nonlinear inelastic constitutive description agree reasonably well with experimental force-displacement, but under-predict the contact area. The apparent fiber cross-sectional area is found to increase up to a maximum of 1.83 times the original area at 46% nominal strain. SEM and AFM images of the meso/nanostructure of the compressed fibers indicate the apparent area growth is due to fibrillation. This fibrillation results in the deformation of a fibril network causing non-uniform fibril nesting and nucleation of new nanoscale voids between fibrils. A comparison of UHMWPE and Kevlar KM2 fiber transverse compressive response is also discussed.