Effect of phase on debond strength in shape memory alloy reinforced composites |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Newmark Civil Engineering Laboratory, 205 North Mathews Ave., Urbana, IL 61801, USA;2. Department of Civil and Environmental Engineering, Western New England University, 1215 Wilbraham Road, Springfield, MA 01119, USA;1. Centre for Composites, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia;2. College of Engineering and Science, Victoria University, Melbourne, Australia;1. Hongik University, Department Of Civil Engineering, Seoul, Republic of Korea;2. Sejong University, Department of Civil Engineering, Seoul, Republic of Korea;3. Chung-Ang University, Department of Civil Engineering, Seoul, Republic of Korea;4. Gyeoungsang National University, Department of Metal and Material Engineering, Jinjoo, Republic of Korea;1. Department of Civil Engineering, Hongik University, Seoul 04066, Republic of Korea;2. Architectural and Urban Systems Engineering, Ewha Womans University, Seoul 03760, Republic of Korea;3. Department of Materials Engineering and Convergence Technology and RIGET, Gyeongsang National University, Jinju, Gyeongnam, 52828, Republic of Korea |
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| Abstract: | Systematic single fiber pullout tests were performed on epoxy composites embedded with nickel titanium shape memory alloy (SMA) wires. The SMA wires were tested in the austenitic or martensitic states to study and decouple the elastic moduli from martensite transformation or reorientation stresses in the analysis of debond loads. The results reveal that the SMA wires that were in the austenite phase consistently produced higher debond loads as compared to that of those wires that started in the martensite phase, likely due to differences in the Poisson’s ratio. Additionally, there appears to be a relationship between the elastic modulus and debond load where reinforcements with a higher elastic modulus displayed lower debond loads. Lastly, for SMA reinforcements that underwent a martensitic phase transformation or reorientation, the debond load was equivalent to the martensite transformation or reorientation load. The results of this work illustrate the sensitivity of SMA reinforced composites on the mechanical behavior and phase transformation characteristics of the constituent materials. |
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| Keywords: | Single fiber pullout Shape memory alloy Martensitic transformation NiTi |
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