Debonding of Carbon Fiber–Reinforced Polymer Patches from Cracked Steel Elements under Fatigue Loading
Publication: Journal of Composites for Construction
Volume 20, Issue 6
Abstract
This paper summarizes the details of a numerical and experimental research program that was conducted to study the debonding of carbon fiber–reinforced polymer (CFRP) patches from cracked steel members under fatigue loading. A preliminary numerical model was developed to investigate the influence of patch debonding on the fatigue life of cracked steel elements. Results indicated that altering the shape and increasing the size of the debonded region could change the calculated crack growth rate by up to 54 times. To validate the model, six steel edge–notched tension coupons were patched with CFRP materials and tested under fatigue loading, while full-field strain distributions were monitored using a digital image correlation (DIC)–based measurement system. Based on the experimental results the numerical model was refined to incorporate the interfacial traction-separation behavior. A parametric study was conducted using the refined numerical model. The results indicate that the size and shape of the debonded region, and therefore the fatigue crack propagation rate, are not only dependent on the fatigue detail and the crack length, but also on the maximum magnitude of the applied fatigue load and the properties of the bonded interface.
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Acknowledgments
The authors would like to acknowledge the financial support provided by the National Science Foundation (CMMI award numbers 1100954 and 1126540) and the department of Civil and Environmental Engineering of the University of Houston. The CFRP materials were donated by Mitsubishi Plastics Composites America Inc. and the epoxy materials were donated by Huntsman Advanced Materials, LLC.
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Information & Authors
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Published In
Journal of Composites for Construction
Volume 20 • Issue 6 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 28, 2015
Accepted: Jan 26, 2016
Published online: Apr 7, 2016
Discussion open until: Sep 7, 2016
Published in print: Dec 1, 2016
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