Fatigue fracture of tough hydrogels

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Fatigue fracture of tough hydrogels

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Title: Fatigue fracture of tough hydrogels
Author: Bai, Ruobing; Yang, Quansan; Tang, Jingda; Morelle, Xavier P.; Vlassak, Joost J.; Suo, Zhigang

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Citation: Bai, Ruobing, Quansan Yang, Jingda Tang, Xavier P. Morelle, Joost Vlassak, and Zhigang Suo. 2017. “Fatigue Fracture of Tough Hydrogels.” Extreme Mechanics Letters 15 (September): 91–96. doi:10.1016/j.eml.2017.07.002.
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Abstract: Tough hydrogels of many chemical compositions have been developed in recent years, but their fatigue fracture has not been studied. The lack of study hinders further development of hydrogels for applications that require long lifetimes under cyclic loads. Examples include tissue engineering, soft robots, and stretchable electronics. Here we study the fatigue fracture of a polyacrylamide-alginate tough hydrogel. We find that the stress-stretch curve changes cycle by cycle, and reaches a steady state after thousands of cycles. The threshold for fatigue fracture is about 53 J/m2, much below the fracture energy (~10,000 J/m2) measured under monotonic load. Nonetheless, the extension of crack per cycle in the polyacrylamide-alginate tough hydrogel is much smaller than that in a single-network polyacrylamide hydrogel.
Published Version: 10.1016/j.eml.2017.07.002
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:34622827
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