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Online interferometric study of viscoelastic rupture and necking deformation of as‐spun (iPP) fibres due to creep process
Author(s) -
SOKKAR TAHA,
ELFARAHATY KERMAL,
AZZAM AMIRA
Publication year - 2016
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/jmi.12310
Subject(s) - necking , creep , materials science , composite material , viscoelasticity , deformation (meteorology) , stress (linguistics) , polypropylene , philosophy , linguistics
Summary 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.