MECHANISTIC ROLE OF YARN AND FABRIC STRUCTURE IN DETERMINING TEAR RESISTANCE OF WOVEN CLOTH .2. MODELING TONGUE TEAR

This paper is concerned with formulating and evaluating a model of ton gue tear. The modeling approach taken is fairly general, and results r ecorded to this point have been encouraging. Although predicting teari ng behavior from parameters determined prior to weaving is not yet pos sible, the implications of this work are important. The model accounts for the effects of yam pull-out, jamming, and stretching, as well as statistical variation in yam strength. Simulations are conducted where these effects are parametrically varied in order to assess their rela tive importance in contributing to tear strength. The effect of pre-lo ading on yam pull-out and the inclusion of jamming resistance are seen to have considerable influence on tearing strength. Furthermore, the success of the model's predictions based on these two principal compon ents suggests a need for developing the mechanics of their associated, unconventional tests. With an understanding of such mechanisms, one c an anticipate a fully predictive model of tear resistance based solely on yarn properties and fabric geometry.