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

McAninch, Ian M.; La Scala, John J.; Palmese, Giuseppe R.; Robinette, E. Jason

doi:10.1002/app.44364

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

Journal Article · 09 September 2016 · Journal of Applied Polymer Science

DOI: https://doi.org/10.1002/app.44364 · OSTI ID:1401013

^[1]; La Scala, John J. ^[2]; Palmese, Giuseppe R. ^[3]; Robinette, E. Jason ^[2]

Army Research Laboratory, Aberdeen Proving Ground Weapons and Materials Research Directorate Maryland 21005, Department of Chemical &, Biological Engineering Drexel University 3141 Chestnut Street Philadelphia Pennsylvania 19104
Army Research Laboratory, Aberdeen Proving Ground Weapons and Materials Research Directorate Maryland 21005
Department of Chemical &, Biological Engineering Drexel University 3141 Chestnut Street Philadelphia Pennsylvania 19104

ABSTRACT 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 μm, foils can be used to initiate cracks with similar results. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44364.

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Sponsoring Organization:: USDOE

OSTI ID:: 1401013

Journal Information:: Journal of Applied Polymer Science, Journal Name: Journal of Applied Polymer Science Journal Issue: 1 Vol. 134; ISSN 0021-8995

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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