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Thin film initiation of cracks for fracture toughness measurements in epoxy resins
Journal article   Open access   Peer reviewed

Thin film initiation of cracks for fracture toughness measurements in epoxy resins

Ian M. McAninch, John J. La Scala, Giuseppe R. Palmese and E. Jason Robinette
Journal of applied polymer science, v 134(1), pp np-n/a
05 Jan 2017
DOI: https://doi.org/10.1002/app.44364
url
https://www.osti.gov/biblio/1401013View
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Abstract

Physical Sciences Polymer Science Science & Technology
The first step in accurately measuring the fracture toughness of a polymeric material is to generate a sharp crack in the sample. Often this is accomplished by tapping a razor blade into the sample, allowing a natural crack to grow; however, it can be difficult to control the crack propagation. Alternate methods for initial crack generation are investigated, including scoring the sample with a razor blade and inserting thin films or foils into the samples during cure. Fluoropolymer films and aluminum and stainless steel foils of various thicknesses are examined in a number of epoxy-amine resins with a range of toughness and glass transition values. None of the alternative methods replicate the results of starting with a natural crack. Furthermore, it is difficult to form satisfactory test samples using fluoropolymer films. For relative toughness comparisons, either the scoring method or thin, 25.4 m, foils can be used to initiate cracks with similar results. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44364.

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Domestic collaboration
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Polymer Science
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