Effect of crystalline structure on the mechanical response of polypropylene under cyclic deformation
-
Aleksey D. Drozdov
,
Rasmus Klitkou
Abstract
To evaluate the influence of crystalline structure on the mechanical behavior of polypropylene (PP), uniaxial tensile cyclic tests with a mixed program (oscillations between fixed maximum strains and the zero minimum stress) were performed on isotactic PP (iPP) manufactured by the Ziegler-Natta catalysis method, metallocene catalyzed PP (mPP), and annealed mPP. Although the stress-strain diagrams of iPP and mPP under tension are quite similar, their responses under unloading differ markedly. The residual strain (measured as the strain under retraction down to the zero stress) of iPP strongly exceeds that of non-annealed mPP, and annealing of mPP increases this difference. To rationalize these findings, constitutive equations are developed in cyclic viscoelasticity and viscoplasticity of semicrystalline polymers, and adjustable parameters in the stress-strain relations are found by fitting the observations. The ability of the model to describe the observed phenomenon and to predict the mechanical response in multi-cycle tensile tests, with various deformation programs, is demonstrated by numerical simulation.
©2013 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- A numerical study of solidification and viscous dissipation effects on polymer melt flow in plane channels
- Structure-property relationship of biodegradable poly(butylene succinate)/polycaprolactone coated inorganic particle composites
- Comparison of injection molding processability of polylactic acid and high density polyethylene via computational approach
- Elastomer nanocomposites based on NBR/BR/nanoclay: morphology and mechanical properties
- Effect of glycerol concentration and temperature on the rheological properties of cassava starch solutions
- Electron-beam irradiation of low density polyethylene/ethylene vinyl acetate blends
- Non-isothermal crystallization kinetics of poly (lactic acid)/graphene nanocomposites
- Interfacial properties and fatigue behavior of carbon fiber epoxy laminate composites
- Effect of crystalline structure on the mechanical response of polypropylene under cyclic deformation
- Erratum
- Effect of solvents and thermal annealing on the morphology development of a novel block copolymer ionomer: a case study of sulfonated polystyrene-block-fluorinated polyisoprene; J. Polym. Eng. 2013, 33, 49–59
