A modified edge crack torsion test for measurement of mode-III fracture toughness of laminated tape composites

M. W. Czabaj, Barry D Davidson, J. G. Ratcliffe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Modifications to the edge crack torsion (ECT) test are studied to improve the reliability of this test for measuring the mode-III fracture toughness, GIIIc, of laminated tape fiber-reinforced polymeric (FRP) composites. First, the data reduction methods currently used in the ECT test are evaluated and deficiencies in their accuracy are discussed. An alternative data reduction technique, which uses a polynomial form to represent ECT specimen compliance solution, is evaluated and compared to FEA results. Second, seven batches of ECT specimens are tested, each batch containing specimens with a preimplanted midplane edge delamination and midplane plies with orientations of +-, with ranging from 0 to 90 in 15 increments. Tests on these specimens show that intralaminar cracking occurs in specimens from all batches except for which = 15 and 30. Tests on specimens of these two batches are shown to result in mode-III delamination growth at the intended ply interface. The findings from this study are encouraging steps towards the use of the ECT test as a standardized method for measuring GIIIc, although further modification to the data reduction method is required to make it suitable for use as part of a standardized test method.

Original languageEnglish (US)
Title of host publicationProceedings of the American Society for Composites - 31st Technical Conference, ASC 2016
PublisherDEStech Publications Inc.
ISBN (Electronic)9781605953168
StatePublished - 2016
Event31st Annual Technical Conference of the American Society for Composites, ASC 2016 - Williamsburg, United States
Duration: Sep 19 2016Sep 21 2016

Other

Other31st Annual Technical Conference of the American Society for Composites, ASC 2016
CountryUnited States
CityWilliamsburg
Period9/19/169/21/16

ASJC Scopus subject areas

  • Ceramics and Composites

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    Czabaj, M. W., Davidson, B. D., & Ratcliffe, J. G. (2016). A modified edge crack torsion test for measurement of mode-III fracture toughness of laminated tape composites. In Proceedings of the American Society for Composites - 31st Technical Conference, ASC 2016 DEStech Publications Inc..