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Authors
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Scetta, G. ; Euchler, E. ; Ju, J. ; Selles, N. ; Heuillet, P. ; Ciccotti, M. ; Creton, C.
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Title
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Self-organization at the crack tip of fatigue-resistant thermoplastic polyurethane elastomers
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Date
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03.11.2021
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Number
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59344
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Abstract
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Despite their technological relevance, the resistance of soft thermoplastic polyurethanes (TPU) to crack propagation in cyclic fatigue has never been investigated in detail. In particular, a clear shortcoming in the literature for this class of materials is the lack of connection between the cyclic fatigue resistance and the large strain behavior that has a fundamental role in defining the material’s resistance to crack propagation. We demonstrate here for the first time that when the strain-induced stiffening mechanism of TPU (already observed for large deformation) is combined with the presence of the nonhomogeneous strain, as in the case of cyclic fatigue, it produces a selective reinforcement in the crack tip area, which is the key to explain the remarkable cyclic fatigue resistance of TPU. Using commercial TPU with similar modulus (~8 MPa) but different large strain behavior, we show that the described mechanism stems from the multiphase nature of TPU and it is not necessarily linked to a specific large strain property as the case of TPU, which undergoes strain-induced crystallization.
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Publisher
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Macromolecules
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Wikidata
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Citation
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Macromolecules 54 (2021) 8726-8737
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DOI
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https://doi.org/10.1021/ACS.MACROMOL.1C00934
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Tags
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