Volume : V, Issue : III, March - 2015

Inverse Relaxation in Yarn and Fabrics

P. K. Mandhyan, R. P. Nachane, N. Shanmugam, S K Dey, S. Banerjee, B R Pawar

Abstract :

All the textile materials are made up of natural and synthetic polymers which are visco–elastic in nature, therefore, exhibit several time dependent properties such as stress relaxation, creep, creep recovery, inverse relaxation, etc. When a fie is extended stress develops in the fie due to increasing strain. If this straining is stopped before rupture of fie and the fie is constrained at that particular strain, the stress developed in the fie starts decaying with time. This phenomenon is known is stress relaxation. If a fie of any polymeric material is strained up to a predetermined level and then allowed to retract partially i.e. the strain is reduced, but not removed completely amounting to some stress being still present in the fie, then it is observed that the stress in the fie increases with time. The rate of increase in stress is initially high, but tends to decrease as time. The phenomena of stress build up called as “inverse relaxation”. Earlier workers quantified inverse relaxation by a measurement called Inverse Relaxation Index. The transition of inverse relaxation from yarns to faic has been attempted in the present study. Two yarns, one coarse and other fine were selected for the study and faics were woven using these two yarns. After determining constructional parameters of faic and various properties of yarns, three levels of extension were chosen. In all the cases samples were tested at different levels of retractions. Extension and retraction were kept at the same level for the faic as that in yarns.

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Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Inverse Relaxation in Yarn and Fabrics Inverse Relaxation in Yarn and Fabrics Indian Journal of Applied Research, Vol.5, Issue : 3 March 2015

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