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R V Iyer
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Volume 22 Issue 1 February 1999 pp 1-7 Rapid Communication
Crystallographic data on axially compressed Kevlar 49 fibres
R V Iyer Kalyani Vijayan K Sooryanarayana T N Guru Row
Axially compressed Kevlar 49 fibres have been examined by X-ray diffraction methods. The most prominent effect of axial compression is the anisotropic deformation of the unit cell. Whereas the
c -axial length, which corresponds to the chain axis, undergoes contraction, the basal plane dimensions manifest enlargement. The deformations increase with the extent of axial compression. The half-widths and the azimuthal spread of reflections also exhibit changes. The compression induced structural changes provide qualitative support to the experimentally observed reduction in tensile strength and modulus. -
Volume 22 Issue 7 December 1999 pp 1013-1023 Composite Materials
Decomposition behaviour of Kevlar 49 fibres: Part I. At
T ≈T dThe structural changes which accompany decomposition of Kevlar 49 fibres at
T =500°C and 550°C, respectively, have been elucidated. At both these temperatures, cumulative thermal exposures of specific durations,t cum(T ), are required to result in decomposition. The conspicuous features which characterize isothermal decomposition of the fibres are: (i) progressive reduction and an eventual total loss in fibre crystallinity, (ii) progressive loss in weight, (iii) introduction of surface damages, (iv) introduction of hollowness, and (v) deterioration in tensile properties.
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Bulletin of Materials Science
Volume 46, 2023
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Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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