Abstract
Numerous accelerated methods for testing long-term viscoelastic properties of fiber reinforced polymer (FRP) composites such as creep and relaxation have been developed in order to reduce the time needed to characterize the material behavior. Most of them are based on the time-temperature-stress superposition principle (TTSSP), or some variation thereof, which involves the manipulation of temperature, applied stress, or both as a way to reduce the testing duration. This paper reports the application of a test called the stepped isostress method (SSM) to study tensile creep of CFRP laminates used in rehabilitating prestressed concrete structures, which experience sustained loads above 60 % of ultimate strength for decades. The SSM employs a load-stepping approach, typically with three to five steps for a single specimen resulting in creep rupture. A key feature of this method is the independence of test results on step size or duration. A simple, repeatable SSM protocol is presented and it is shown that this method is also useful for studying creep rupture of CFRP.
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Acknowledgements
The authors would like to thank William Ordel (VCTIR) for his assistance, as well as Glasforms, Inc. for providing the cured CFRP laminates. This research was funded by the Virginia Center for Transportation Innovation and Research.
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© 2016 The Society for Experimental Mechanics, Inc.
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Tanks, J.D., Rader, K.E., Sharp, S.R. (2016). Accelerated Creep Testing of CFRP with the Stepped Isostress Method. In: Ralph, C., Silberstein, M., Thakre, P., Singh, R. (eds) Mechanics of Composite and Multi-functional Materials, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-21762-8_46
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DOI: https://doi.org/10.1007/978-3-319-21762-8_46
Publisher Name: Springer, Cham
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