Response Features of Silk Warp Yarns during Weaving

Abstract

Raw, undegummed organzine, and degummed organzine mulberry warp silk yarns were subjected to cyclic loading on tensile testing instrument by simulating the conditions of the loom during weaving. Minimum and maximum load for these cyclic loading were designated based on the theoretical base tension on the warp yarns and maximum tension at beat-up process. The speed of cyclic loading was attuned to match with the speed of the conventional power loom. The stress-strain curves of the yarns were analyzed and the deformation behavior was investigated with respect to yield point, maximum load, elongation, and energy. The response of silk warp yarn to fatigue developed during weaving due to its tensile deformation behavior was studied at the fabric formation stage. All the three warp yarns exhibited significant deformation during weaving. Cyclic loading had resulted in modification of the tensile deformation characteristics of the three different types of mulberry silk yarns and the deformations in the hookean region signified the phenomenon of strain hardening.

Keywords

• cyclic loading
• stress-strain curve
• tensile deformation
• fatigue
• elongation
• yields point