Fading memory of deformation history in carbon black-filled thermoplastic elastomers

Published Date
Polymer Testing
April 2017, Vol.58:1–12, doi:10.1016/j.polymertesting.2016.12.008
Property Modelling

• Author 

• Necmi Dusunceli ^a,,
• Aleksey D. Drozdov ^b

• aDepartment of Mechanical Engineering, Aksaray University, Aksaray 68100, Turkey
• bDepartment of Mechanical and Manufacturing Engineering, Aalborg University, Aalborg 9220, Denmark

Received 18 August 2016. Revised 10 November 2016. Accepted 3 December 2016. Available online 5 December 2016. 

Abstract

Observations are reported on a carbon black–reinforced thermoplastic elastomer in multistep uniaxial tensile cyclic tests with a mixed deformation program (oscillations between maximum elongation ratios k_max and various minimum stresses σ_min with k_max monotonically increasing with number of cycles n). Fading memory of deformation history is demonstrated: when specimens are subjected to two loading programs that differ along the first n −1 cycles of deformation and coincide afterwards, their stress–strain diagrams become identical starting from the nth cycle. A constitutive model is developed in cyclic viscoplasticity with finite deformations, and its adjustable parameters are found by fitting the observations. Ability of the stress–strain relations to describe the fading memory phenomenon and to predict the mechanical response of polymer composites in multi-step cyclic tests with large strains is confirmed by numerical simulation.

Keywords

Thermoplastic elastomer

Cyclic deformation

Finite viscoplasticity

Fading memory

Constitutive model

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