Determination of multiaxial stress linear dimensional change of textile surfaces

Abstract

Breaking characteristics of loose woven and knitted fabrics are frequently determined by the ball penetration resistance (bursting) (test). The Yugoslav Standard JUS F.S2.022 does not include the determination of sample dimensional change and in the foreign literature there are only empirical equations for the estimating this property. In this work an attempt is made to calculate exact linear deformations of textile samples in function of ball dimensions and measured length of its movement during the bursting test. Detailed calculation of an approximate equation for estimating dimensional changes and relating them in a simple form with the motion of the ball is also given. This calculation is necessarily approximate, because of the transcendental character of corresponding geometrical relations, but this does not diminish its general validity.