ABSTRACT
Viscoelastic materials play a key role in mechanical designs due to its numerous application. Even though numerical models already exist and are included in commercial codes, the precision of the calculation depends strongly on the material characterization and the parameters identification. In our research, we propose the characterization of the viscoelasticity of a material, whose nonlinear elasticity was previously defined with a strain–stress test, and then we perform a relaxation test. Also three rheological models are studied in order to fit this test. The optimization problem is solved checking two optimization techniques: a deterministic local search method as Newton and a non-deterministic global search method as genetic algorithm. Both methods are compared with a known solution and a real test. Finally, we perform a load–unload test and compare the results with a Finite Element simulation where the viscoelastic material is defined using the well-known Prony series.
Disclosure statement
No potential conflict of interest was reported by the authors.
ORCID
J. R. Fernández http://orcid.org/0000-0002-8533-1858
J. A. López-Campos http://orcid.org/0000-0002-0391-7661
A. Segade http://orcid.org/0000-0002-8055-3689