CUED Publications database

Indentation of polyethylene laminates by a flat-bottomed cylindrical punch

O'Masta, MR and Crayton, DH and Deshpande, VS and Wadley, HNG (2016) Indentation of polyethylene laminates by a flat-bottomed cylindrical punch. Composites Part A: Applied Science and Manufacturing, 80. pp. 138-147. ISSN 1359-835X

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© 2015 Elsevier Ltd. All rights reserved. Cross-ply polymer laminates reinforced by ultra-high molecular weight polyethylene (UHWMPE) fibers and tapes have been subjected to quasi-static indentation by a flat-bottomed, circular cross section punch and their penetration resistance and failure mechanisms investigated. Three fiber- and two tape-reinforced grades progressively failed during indentation via a series of unstable failure events accompanied by substantial load drops. This resulted in a 'saw-tooth' load versus indentation depth profile as the load increased with indentation depth after each failure event. The penetration behavior scaled with the ratio of the thickness of the remaining laminate to the diameter of the punch, and the indentation pressure scaled with the through thickness compressive strength. Failure occurred by ply rupture. The results are consistent with penetration governed by an indirect tension failure mechanism, and with experimental reports that tape-reinforced materials have a similar ballistic resistance to the higher tensile strength fiber-reinforced grades in rear-supported test conditions.

Item Type: Article
Divisions: Div C > Materials Engineering
Div C > Applied Mechanics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:41
Last Modified: 15 Sep 2020 04:59
DOI: 10.1016/j.compositesa.2015.10.015