Online interferometric study of viscoelastic rupture and necking deformation of as-spun (iPP) fibres due to creep process
Autor: | Amira A. S. Azzam, T.Z.N. Sokkar, K.A. El-Farahaty |
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Rok vydání: | 2016 |
Předmět: |
010407 polymers
Histology Materials science Diffusion creep 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Viscoelasticity Physics::Geophysics 0104 chemical sciences Pathology and Forensic Medicine Stress (mechanics) Creep Condensed Matter::Superconductivity Fracture (geology) Composite material Deformation (engineering) 0210 nano-technology Refractive index Necking |
Zdroj: | Journal of Microscopy. 261:3-13 |
ISSN: | 0022-2720 |
DOI: | 10.1111/jmi.12310 |
Popis: | Creep deformation under constant load leads to rupture when the polymer chains can no longer separate and accommodate the load. This fracture phenomenon is investigated interferometrically. The creep behaviour of as-spun isotactic Polypropylene (iPP) fibres is studied at different stresses, different initial lengths and different radii. The creep rate, which defines the velocity of the creep deformation and the dimensional stability of the material, is studied. The failure time and stress of iPP due to creep process is determined. The necking deformation was in situ detected during creep process. The mean refractive indices (n(P) andn⊥) profiles of iPP fibres were determined at different positions along the fibre axis before and after necking. The relation between the creep behaviour and different optical and structural parameters is investigated. Microinterferograms are given for illustration. |
Databáze: | OpenAIRE |
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