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Open AccessArticle

In Situ Observation on Rate-Dependent Strain Localization of Thermo-Induced Shape Memory Polyurethane

1
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
2
Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(6), 982; https://doi.org/10.3390/polym11060982
Received: 10 April 2019 / Revised: 12 May 2019 / Accepted: 13 May 2019 / Published: 4 June 2019
(This article belongs to the Special Issue Shape Memory Polymers III)
In situ monotonic tensile experiments of thermo-induced shape memory polyurethane (SMPU) at different loading rates were carried out by the digital image correlation (DIC) method and infrared camera FLIR®-A655sc in natural convection (NC) and forced convection (FC) conditions, respectively. The multiform strain localization of SMPU was observed by the DIC method, and the influence of thermo–mechanical coupling on the strain localization was analyzed by using the FLIR to measure the temperature field caused by the internal heat generation. The experimental results show that the strain localization mode strongly depends on the strain rate and convection condition, and the strain localization mode can be transformed by changing the convection condition from NC to FC. The competition mechanism between the strain hardening induced by the increasing loading rate and strain softening induced by the internal heat generation is indicated, the transition modes of strain localization are clarified, and the influences of thermo–mechanical coupling on shape memory effect are discussed.
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Keywords: shape memory polyurethane; rate-dependence; strain localization; internal heat generation; thermo–mechanical coupling shape memory polyurethane; rate-dependence; strain localization; internal heat generation; thermo–mechanical coupling
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MDPI and ACS Style

Li, J.; Kan, Q.; Chen, K.; Liang, Z.; Kang, G. In Situ Observation on Rate-Dependent Strain Localization of Thermo-Induced Shape Memory Polyurethane. Polymers 2019, 11, 982.

AMA Style

Li J, Kan Q, Chen K, Liang Z, Kang G. In Situ Observation on Rate-Dependent Strain Localization of Thermo-Induced Shape Memory Polyurethane. Polymers. 2019; 11(6):982.

Chicago/Turabian Style

Li, Jian; Kan, Qianhua; Chen, Kaijuan; Liang, Zhihong; Kang, Guozheng. 2019. "In Situ Observation on Rate-Dependent Strain Localization of Thermo-Induced Shape Memory Polyurethane" Polymers 11, no. 6: 982.

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