Relationship of Tensile and Tear Strengths of Fabrics to Component Yarn Properties
ARMY NATICK LABS MA CLOTHING AND PERSONAL LIFE SUPPORT EQUIPMENT LAB
Pagination or Media Count:
The investigation was conducted on six selected fabrics to determine the relationship of breaking load, elongation and tear strength of fabrics to the properties of the component yarns. A system for expressing fabric properties as ratios of the contributing yarn properties was developed. Two factors termed cloth assistance factor CAF and cloth elongation factor CEF were used to characterize the effect of thread crossings in the fabric structure. These two factors show a linear relationship. It was concluded that the excess of fabric strength and elongation over that of yarn strength, elongation and crimp was due to the crossing threads effectively reducing the lengths of yarn elements in the test specimen thus localizing the rupture mechanism. Fabric tear strength and yarn strength were related through a third factor called tear efficiency factor TEF. This factor defines the relationship between warp and filling tear strengths of the fabric in terms of the yarn strengths and threads per inch.