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

Published Date
Composites Science and Technology
December 2009, Vol.69(15):2596–2603, doi:10.1016/j.compscitech.2009.07.018

• Author 

• A.D. Drozdov ^a,,
• A.-L. Høg Lejre ^a
• J. deC. Christiansen ^b

• aDanish Technological Institute, Gregersensvej 1, 2630 Taastrup, Denmark
• bDepartment of Production, Aalborg University, Fibigerstraede 16, 9220 Aalborg, Denmark

Received 16 June 2009. Revised 20 July 2009. Accepted 30 July 2009. Available online 3 August 2009. 

Abstract

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.

Keywords

A. Nanocomposites

B. Creep

C. Modeling

D. Life prediction

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