NUMERICAL PREDICTIONS AND MECHANICAL TESTING OF BRAIDED COMPOSITE STRUCTURES UTILISING DIGITAL IMAGE CORRELATION

Authors

  • Emil Pitz Institute of Polymer Product Engineering, Johannes Kepler Universität Linz, Altenberger Straße 69, Linz, Austria, 4040
  • Matei-Constantin Miron Institute of Polymer Product Engineering, Johannes Kepler Universität Linz, Altenberger Straße 69, Linz, Austria, 4040
  • Imre Kállai
  • Zoltán Major

DOI:

https://doi.org/10.14311/APP.2017.7.0043

Abstract

The current paper is describing the implementation of a multiscale numerical model for prediction of stiffness and strength in braided composites. The model is validated by experimental testing of single-layer braided tubes under torsional loading utilising digital image correlation (DIC). For the numerical model the entire braided structure is modelled at yarn detail level, taking into account the yarn behaviour as well as individual yarn-to-yarn interactions by using cohesive contact definitions. By means of Hashin’s failure criteria and cohesive contact damage, failure of the yarns and failure of the yarn-to-yarn interface is being accounted for. Thereby the material failure behaviour can be predicted. For validation of the model, torsion tests of biaxially braided single-layer composite tubes were performed. The strain distribution at the specimen surface was studied using the DIC system ARAMIS in 3D mode.

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Published

2016-12-09

Issue

Vol. 7 (2017): ExNum 2016

Section

Articles

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