A Comparative Analysis of Tear Strength Methods

B. Witkowska,
I. Frydrych*
The Institute of Textile Materials Engineering
ul. Gdańska 118, 90-520 Łódź, Poland
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*Technical University of Łódź
ul. Żeromskiego 115, 90-924 Łódź, Poland
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Abstract
Fabric utility parameters most often depend on its mechanical properties. The most important strength parameters include unidirectional tensile strength, tear strength and elasticity properties. In this work we describe in detail the problem of tear strength, appropriate measurement methods and the correlation relationships between the results obtained by different tear methods. The measurements of tear strength were carried out for a chosen group of protective textiles. In addition, the unidirectional tensile strength was measured for the group of textiles mentioned above, and the correlation coefficients between the tensile strength and tear strength were calculated by different methods.
Key words: tear force, tearing strength, testing methods, static tearing, dynamic tearing.

Introduction

The utility functions which fabrics should fulfil first of all depend on their destination. Woven fabrics have a very wide range of applications, starting from underwear and everyday clothing, through protective and work clothing, decorative and furniture fabrics, up to technical textiles. Such a wide range of application means that during their lifetime fabrics undergo actions from different forces and strains depending on their destination and working conditions [1].
They can be stretched in one direction (for example, safety and transportation belts) or in many directions (for example, furniture fabrics), torn (for example, elements of sleeves and trousers) or compressed (for example, rigid interlining). In most of the mentioned cases fabrics are used at least a few times, and sometimes the number of work cycles can total many thousands of repetitions. In each work cycle, the total deformations are significant, and users expect that, after removing the forces, the fabric will return to its primary state [1].....................