| Autor: |
McAninch, Ian M., La Scala, John J., Palmese, Giuseppe R., Robinette, E. Jason |
| Předmět: |
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| Zdroj: |
Journal of Applied Polymer Science; 1/5/2017, Vol. 134 Issue 1, pn/a-N.PAG, 16p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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