ELASTO-VISCOPLASTIC BEHAVIOR OF A POLYVINYLIDENE FLUORIDE (PVDF) IN TENSION

João Marciano Laredo dos Reis¹; Heraldo Silva da Costa Matto¹; EDUARDO PEREIRA MOTTA¹

¹ UFF

doi:10.20906/CPS/COB-2015-1761

Resumo

The present paper is concerned with the plasticity of a polyvinylidene fluoride (PVDF) in tension. Strain rate strongly influences the plastic behavior, but the variation of the elastic properties is almost negligible within the range of strain rates considered in the study (from 1.6 x 10-4 s-1 up to 1.6 x 10-1 s-1). In particular, the yield stress and the ultimate tensile strength are strongly rate-dependent. A one-dimensional elasto-viscoplastic phenomenological model is proposed and analyzed. Despite the nonlinearity of the model equations, only one tensile test performed with variable strain rate is sufficient to identify all material parameters. Model predictions are compared with experiments showing good agreement.

Palavras-chave: PVDF; Tensile tests; Strain rate; Constitutive modeling; Elasto-viscoplasticity