NDLI: Mechanical and Infrared Thermography Analysis of Shape Memory Polyurethane

Content Provider	Springer Nature Link
Author	Pieczyska, Elzbieta Alicja Maj, Michal Kowalczyk Gajewska, Katarzyna Staszczak, Maria Urbanski, Leszek Tobushi, Hisaaki Hayashi, Shunichi Cristea, Mariana
Copyright Year	2014
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.
Starting Page	2553
Ending Page	2560
Page Count	8
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	23
Issue Number	7
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2014-04-15
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	constitutive model dynamic mechanical analysis shape memory polyurethane strain rate temperature change thermomechanical couplings Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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