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Mechanical and Infrared Thermography Analysis of Shape Memory Polyurethane

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Abstract

Multifunctional new material—polyurethane shape memory polymer (PU-SMP)—was subjected to tension carried out at room temperature at various strain rates. The influence of effects of thermomechanical couplings on the SMP mechanical properties was studied, based on the sample temperature changes, measured by a fast and sensitive infrared camera. It was found that the polymer deformation process strongly depends on the strain rate applied. The initial reversible strain is accompanied by a small drop in temperature, called thermoelastic effect. Its maximal value is related to the SMP yield point and increases upon increase of the strain rate. At higher strains, the stress and temperature significantly increase, caused by reorientation of the polymer molecular chains, followed by the stress drop and its subsequent increase accompanying the sample rupture. The higher strain rate, the higher stress, and temperature changes were obtained, since the deformation process was more dynamic and has occurred in almost adiabatic conditions. The constitutive model of SMP valid in finite strain regime was developed. In the proposed approach, SMP is described as a two-phase material composed of hyperelastic rubbery phase and elastic-viscoplastic glassy phase, while the volume content of phases is specified by the current temperature.

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Acknowledgments

The research has been carried out with the support of the Polish National Center of Science under Grant No. 2011/01/M/ST8/07754 and (JSPS), Grant-in-Aid for Scientific Research (C) under No. 23560103. Authors thank Michal Majewski, a student of Warsaw University of Technology, for his contribution to graphical presentation of results.

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Authors and Affiliations

  1. Institute of Fundamental Technological Research PAS, Warsaw, Poland

    Elzbieta Alicja Pieczyska, Michal Maj, Katarzyna Kowalczyk-Gajewska, Maria Staszczak & Leszek Urbanski

  2. Aichi Institute of Technology, Toyota, Japan

    Hisaaki Tobushi

  3. SMP Technologies Inc, Tokyo, Japan

    Shunichi Hayashi

  4. Petru Poni Institute of Macromolecular Chemistry, Iasi, Romania

    Mariana Cristea

Authors
  1. Elzbieta Alicja Pieczyska
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  2. Michal Maj
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  3. Katarzyna Kowalczyk-Gajewska
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  4. Maria Staszczak
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  5. Leszek Urbanski
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  6. Hisaaki Tobushi
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  7. Shunichi Hayashi
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  8. Mariana Cristea
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Corresponding author

Correspondence to Elzbieta Alicja Pieczyska.

Additional information

This article is an invited paper selected from presentations at the International Conference on Shape Memory and Superelastic Technologies 2013, held May 20-24, 2013, in Prague, Czech Republic, and has been expanded from the original presentation.

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Pieczyska, E.A., Maj, M., Kowalczyk-Gajewska, K. et al. Mechanical and Infrared Thermography Analysis of Shape Memory Polyurethane. J. of Materi Eng and Perform 23, 2553–2560 (2014). https://doi.org/10.1007/s11665-014-0963-2

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  • DOI: https://doi.org/10.1007/s11665-014-0963-2

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