Constitutive model for shape memory polyurethane based on phase transition and one-dimensional non-linear viscoelastic. (December 2018)

• Record Type: Journal Article
• Authors: Dong, Yubing; Zhu, Yaofeng; Liu, Meng; Dong, Qinxi; Li, Ran; Fu, Yaqin
• Is Part Of: Materials today communications. Volume 17(2018)
• Page Start: 133
• Page End: 139
• Publication Date: 2018-12
• Subjects: Shape memory polymers -- Constitutive model -- Viscoelastic behavior -- Phase; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2018.08.020
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Shape memory polymers are the most essential branches of smart materials, which can be fixed at a temporary shape and recover to permanent shape in response to environmental stimuli, such as temperature, electricity, light and magnetic field. To provide a suitable mechanism for shape memory polyurethanes (SMPU) and to predict their behavior, in this study, a nonlinear viscoelastic constitutive equation was constructed based on the viscoelasticity theory and phase transition theory. A modified three element model with Kohlrausch-Williams-Watts (KWW) stretched exponential function was used to simulate the mechanical behavior of frozen and active phases to describe the viscoelastic behavior of SMPU. A connection coefficient k, which describes the connection model of frozen and active phases, was proposed to represent the relation between the effective modulus and that of each phase.