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Fibers 2018, 6(4), 69; https://doi.org/10.3390/fib6040069

Mechanical Behavior of High-Performance Yarns Transversely Loaded by Different Indenters

1
School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN 47907, USA
2
School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA;
*
Author to whom correspondence should be addressed.
Received: 11 August 2018 / Revised: 18 September 2018 / Accepted: 21 September 2018 / Published: 23 September 2018
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Abstract

In this study, we performed off-axis transverse loading experiments to study the stress concentration developed in a high-performance yarn with different indenters. A universal testing machine was utilized to perform quasi-static transverse loading experiments on Twaron® yarns. Seven different round indenters possessing radius of curvature ranging from 0.20 to 4.50 mm were employed in the experiments. In addition, post-mortem failure analysis was performed on the recovered specimens via a scanning electron microscope. From the transverse loading experiments, the results showed that, as the radius of curvature of the indenters increased, the concentrated load decreased, causing the failure surfaces to change from a combination of kink band, snapped-back, and localized shear to only fibrillations. The concentrated stresses were predicted by a strain energy model when loaded by an indenter with a radius of curvature smaller than 1.59 mm. For indenters larger than 1.59 mm, the specimens failed in fibrillation, the concentrated stresses agreed well with the stresses predicted by quasi-static circular curved beam theory. View Full-Text
Keywords: transverse impact; high-performance fiber; critical velocity; strain energy; curved beam transverse impact; high-performance fiber; critical velocity; strain energy; curved beam
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lim, B.H.; Chu, J.-M.; Chen, W. Mechanical Behavior of High-Performance Yarns Transversely Loaded by Different Indenters. Fibers 2018, 6, 69.

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