Details

Autor(en) / Beteiligte

• Saleeb, A.F.
• Natsheh, S.H.
• Owusu-Danquah, J.S.

Titel

A multi-mechanism model for large-strain thermomechanical behavior of polyurethane shape memory polymer

Ist Teil von

• Polymer (Guilford), 2017-11, Vol.130, p.230-241

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The physical mechanisms underlining the unique shape memory behavior in polymers differ greatly from those in intermetallics. However, phenomenologically, both material systems exhibit pseudoplasticity and superelasticity. This provides the main motivation for the present work, in which a recently-developed multi-mechanism model, previously used successfully for intermetallics is extended to capture the thermomechanical responses of a polyurethane-polyester-polyol material having a glass temperature of 55 °C. To this end, nine different tensile test cases were considered, including engineering strains up to 200%, stress changes up to 120 MPa, temperature range from 35 °C to 75 °C, as well as cyclic isothermal and non-isothermal behaviors. The model results were found to be in excellent agreement with the experiments. Additionally, investigations were carried out to provide macromolecular connection of the model inelastic state variables, as well as study its loading-mode and loading-rate sensitivities. •A 3D Multi-mechanism Model is formulated for Polyurethane Shape memory polymer having Tg = 55 °C.•Five isothermal tensile test cases at Tg ± 20 °C, including engineering strains up to 200%, were considered.•Four cyclic non-isothermal shape recovery tests were predicted.•Macromolecular connection between model inelastic state variables and SMP physics is provided.