Torsional Relaxation and the Effect of Twisting in Enhancing the Tensile Strength of Silkworm Silk
نویسنده
چکیده
Studies of torsional properties of natural silk fibers seem to open a new window in understanding the correlation between their extraordinary mechanical properties and their microscopic structure. In this paper, the torsional relaxation profiles of single-stranded Bombyx mori silk was obtained from our experiment, and a prominent under-damping mode was identified. It was concluded that the single damping mode is an implication that along the transverse plane, the silk fiber has a quasi-periodic arrangement at higher level structure. The torsional rigidity and internal environmental viscosity have been obtained from the torsional profile. Due to the potential enhancement of tensile strength by twisting the silk fibres, trials for various twisting cycles were carried out in order to build a quantitative relation between the extent of twist and the tensile strength. An obvious enhancement with a non-monotonous trend is observed, bringing an optimal increase of 30% above the original strength.
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