Next Article in Journal
Influence of an Impregnation Treatment on the Morphology and Mechanical Behaviour of Flax Yarns Embedded in Hydraulic Lime Mortar
Previous Article in Journal
Liquid Phase Selective Hydrogenation of Phenol to Cyclohexanone over Electrospun Pd/PVDF-HFP Catalyst
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle

The Effect of Projectile Nose Shape on the Critical Velocity of High-Performance Yarn

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.
Fibers 2019, 7(4), 29; https://doi.org/10.3390/fib7040029
Received: 3 March 2019 / Revised: 26 March 2019 / Accepted: 28 March 2019 / Published: 3 April 2019
  |  
PDF [4077 KB, uploaded 3 April 2019]
  |  

Abstract

In this study, ballistic experiments were performed to determine the critical velocity of a Twaron® 2040 high-performance yarn transversely impacted by round projectiles. Four different round projectiles possessing a radius of curvature of 2 µm, 20 µm, 200 µm and 2 mm were used in this study. Load cells were mounted to the grips to measure the load history of the yarn upon impact. A high-speed camera was incorporated into the ballistic experimental setup to capture the failure process of the yarn upon impact. A scanning electron microscope was utilized to perform post-mortem failure analysis on the recovered specimens. The results showed that as the radius of curvature of the projectile increased, the critical velocity also increased. The critical velocities for all cases were bounded between those predicted from the Euler–Bernoulli beam and Smith models. Upon impact above the upper limit of the critical velocity, the axial loads revealed a demonstrative reduction. The failure surfaces changed from shear to fibrillation as the radius of curvature increased. For those specimens that failed in shear, Hertzian contact model was used to predict the critical velocity. View Full-Text
Keywords: high-performance fiber; critical velocity; ballistic experiments; projectile nose shape; Smith theory high-performance fiber; critical velocity; ballistic experiments; projectile nose shape; Smith theory
Figures

Figure 1

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).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Lim, B.H.; Chu, J.-M.; Gao, J.; Claus, B.; Nie, Y.; Chen, W. The Effect of Projectile Nose Shape on the Critical Velocity of High-Performance Yarn. Fibers 2019, 7, 29.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Fibers EISSN 2079-6439 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top