The unusual creep and relaxation behaviour of polypropylene
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Necmi Dusunceli
Abstract
This paper focuses on experimental investigation and modelling of the unusual creep and relaxation behaviour of polypropylene. A polypropylene specimen was loaded up to three different levels of maximum strain (ɛmax), unloaded to various minimum stresses (σmin), creep and relaxation tests were performed at seven different strain levels. In addition to investigate the effect of loading history on unloading paths, multiple creep experiments were conducted at various stress levels. It was observed that unusual creep and relaxation behaviour of polypropylene depended on a strain increment (Δɛ) which is the difference between the minimum (ɛmin) and maximum strain level (ɛmax). Increasing the strain increment affects the creep and relaxation behaviour on loading path. As a result, the creep and relaxation behaviours of polypropylene show non-monotonic characteristics. The viscoplasticity theory based on overstress for polymer (VBOP) model was used to model the unusual creep and relaxation behaviour of polypropylene. From the comparison between the VBOP model predictions and the experimental results, it can be seen that the VBOP model can model both the unusual creep and relaxation behaviours of a semicrystalline polymer.
©2012 by Walter de Gruyter Berlin Boston
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- Masthead
- Masthead
Articles in the same Issue
- Original Articles
- Study of rheological and mechanical properties of ternary blends of iPP/LDPE/EPDM
- Rheological investigation of shear-enhanced crystallization for polylactide composites with different aspect ratio carbon nanotubes
- In situ formation of nano-scale PMMA network structures on the surface of immiscible polymer blends by solvent extraction and redeposition
- Effect of various additives on mechanical properties of rice husk polypropylene (RHPP) composites
- The unusual creep and relaxation behaviour of polypropylene
- Influence of MMT as reinforcement on rheological behavior, mechanical and morphological properties of recycled PET/ABS thermoplastic nanocomposites
- Preparation and properties of melt blended metallocene polyethylene/silica nanocomposites: modifier effects
- Tribological performance of industrial polyamide-imide and its composite under different cooling conditions
- Preparation of high molecular weight and elastic copolyester by reactive extrusion with diisocyanate compound for laser printing process
- Masthead
- Masthead
