Abstract
Background
Because of considerable experimental difficulties for measuring the viscoelastic Poisson´s ratio of polymers and the scarcity of reported data of this property for most of polymers, in particular, elastomers, new measurement methods and procedures need to be developed.
Objective
The aim of this article is to provide a simple, suitable and reliable procedure to allow the determination of the viscoelastic Poisson’s ratio of elastomers from simple creep strain measurements based on digital image correlation.
Methods
To illustrate the proposed procedure, a silicone rubber was tested and analyzed. It consisted of performing creep tests at different stresses and temperatures for 10 min (short-term creep tests) measuring simultaneous axial and transverse strains with a DIC equipment. Creep strain functions in axial and transverse direction were obtained employing a creep model. Then, the strain functions were used to calculate the viscoelastic Poisson´s ratio through a transformation method and to obtain their long-term curves.
Results
The results obtained demonstrated significant stress and temperature dependency of the viscoelastic Poisson´s ratio for the silicone rubber. It was observed that the viscoelastic Poisson’s ratio increases with temperature but tends to a certain value, and tends to 0.5 for higher temperatures. Overall, the proposed procedure exhibited notable ease and accuracy for the assessment of viscoelastic Poisson´s ratio of elastomers.
Conclusions
Finally, the methodology followed in this work can be a potential alternative tool for the characterization of viscoelastic Poisson´s ratio of elastomers, which is currently scarce in literature.
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Farfan-Cabrera, L.I., Pascual-Francisco, J.B. An Experimental Methodological Approach for Obtaining Viscoelastic Poisson’s Ratio of Elastomers from Creep Strain DIC-Based Measurements. Exp Mech 62, 287–297 (2022). https://doi.org/10.1007/s11340-021-00792-9
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DOI: https://doi.org/10.1007/s11340-021-00792-9