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Essential work of fracture study of polymers: a novel criterion for the validation of tested ligament range

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Abstract

The essential work of fracture method is widely used for the determination of fracture toughness of ductile metals and polymers under plane stress conditions. Nevertheless, this method has numerous prerequisites, which are easy to fulfill in metals, but are less certain in polymers. The aim of this study was, therefore, to present a simple, empiric “displacement-criterion” that helps the determination of valid ligament lengths for polymers—one of the biggest sources of error of this theory. This criterion not only facilitates the definition of a lower bound, but also helps the description of an upper ligament limit. Its other advantage is, that combined with a stress criterion, it helps the data validation not only until crack initiation, but also over the entire deformation process.

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Acknowledgements

This study is connected to the scientific program of the “Development of quality-oriented and harmonized R+D+I strategy and functional model at BME” project. This project is supported by the New Széchenyi Plan (Project ID: TÁMOP-4.2.1/B-09/1/KMR-2010-0002).

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Authors and Affiliations

  1. Department of Polymer Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, 1111, Budapest, Hungary

    Ferenc Tuba & Péter Nagy

  2. Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria

    László Oláh

  3. Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700, Leoben, Austria

    László Oláh

Authors
  1. Ferenc Tuba
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  2. László Oláh
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  3. Péter Nagy
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Correspondence to Ferenc Tuba.

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Tuba, F., Oláh, L. & Nagy, P. Essential work of fracture study of polymers: a novel criterion for the validation of tested ligament range. J Mater Sci 46, 7901–7904 (2011). https://doi.org/10.1007/s10853-011-5778-z

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  • DOI: https://doi.org/10.1007/s10853-011-5778-z

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