Nonlinear load-strain modeling of polypropylene geogrids during constant rate-of-strain loading

Journal article

Authors/Editors

WARAT KONGKITKUL

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Publication Details

Author list: Ezzein F.M., Bathurst R.J., Kongkitkul W.

Publisher: Wiley

Publication year: 2015

Journal: Polymer Engineering and Science (0032-3888)

Volume number: 55

Issue number: 7

Start page: 1617

End page: 1627

Number of pages: 11

ISSN: 0032-3888

eISSN: 1548-2634

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931957371&doi=10.1002%2fpen.23999&partnerID=40&md5=64f0b6258d9267e74b1405cec59cd8ef

Languages: English-Great Britain (EN-GB)

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Abstract

This article describes a rate-dependent hyperbolic model that was developed to predict the tensile load-strain behavior of a polypropylene geogrid reinforcement material under monotonic and stepped constant rate-of-strain testing. A more general three-component model previously reported in the literature was also used in the current study but with some modifications to compute model parameters. Details of the trial and error procedure to select three-component model parameters, not previously reported in the literature, are explained. Both models gave similar good agreement between measured and predicted constant rate-of-strain tests. The accuracy of the three-component model to simulate stepped constant rate-of-strain tests was judged to be better, but for practical purposes, the simpler hyperbolic model was judged to be satisfactory. An advantage of the hyperbolic model is that the model parameters are easy to determine, only monotonic constant rate-of-strain tests are required, and numerical implementation is simple. However, the hyperbolic model is restricted to monotonic or stepped constant rate-of-strain load paths. An advantage of the more complicated three-component model is that it has been demonstrated in previous studies to be more general and thus can be used for other load paths and other polymeric reinforcement material types that do not have characteristic hyperbolic load-strain behavior. ฉ 2015 Society of Plastics Engineers.

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