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

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

doi:10.1002/app.44364

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

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

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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.

Original language	English (US)
Article number	44364
Journal	Journal of Applied Polymer Science
Volume	134
Issue number	1
DOIs	https://doi.org/10.1002/app.44364
State	Published - Jan 5 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Surfaces, Coatings and Films
Polymers and Plastics
Materials Chemistry

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10.1002/app.44364

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title = "Thin film initiation of cracks for fracture toughness measurements in epoxy resins",

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.",

author = "McAninch, {Ian M.} and {La Scala}, {John J.} and Palmese, {Giuseppe R.} and Robinette, {E. Jason}",

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AU - Palmese, Giuseppe R.

AU - Robinette, E. Jason

N1 - Funding Information: This research was supported in part by an appointment to the Postgraduate Research Participation Program at the U.S. Army Research Laboratory administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the U.S. Department of Energy and USARL. Publisher Copyright: © 2016 Wiley Periodicals, Inc.

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N2 - 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.

AB - 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.

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

Abstract

All Science Journal Classification (ASJC) codes

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