An Experimental Methodological Approach for Obtaining Viscoelastic Poisson¿s Ratio of Elastomers from Creep Strain DIC-Based Measurements Academic Article in Scopus uri icon

abstract

  • © 2021, Society for Experimental Mechanics.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.

publication date

  • February 1, 2022