Portal de Periódicos da CAPES

Viscoelasticity, viscoplasticity, and creep failure of polypropylene/clay nanocomposites

2009; Elsevier BV; Volume: 69; Issue: 15-16 Linguagem: Inglês

10.1016/j.compscitech.2009.07.018

1879-1050

Aleksey D. Drozdov, A.-L. Høg Lejre, Jesper de Claville Christiansen,

Tribology and Wear Analysis

Observations are reported on polypropylene/clay nanocomposites in tensile tests with various strain rates, relaxation tests at various strains, and creep tests with various stresses at room temperature. New constitutive equations are derived in viscoelasticity and viscoplasticity of nanocomposites. Adjustable parameters are found by fitting the experimental data. The stress–strain relations are applied to the analysis of creep rupture. It is demonstrated that reinforcement of polypropylene with 1 wt.% of nanoclay induces an increase in time to failure by an order of magnitude.