Analysis of Pre-tension Level upon Biaxial Behaviour of Fused Systems
The results of fused multilayer systems pre-tension level upon biaxial loading are presented in this research work. The values of initial pre-tension of fused multilayer systems in longitudinal and transverse directions were: 0.0 %, 0.4 %, 0.8 %, 1.2 %, 1.7 % and 2.1 %. The results of the investigations have shown that deformational characteristics (F, N and Hmax, mm) in longitudinal and transverse directions differ with the increase of pre-tension level. Thus, seam allowances can be defined more accurately in more deformable direction at the stage of product development. Cotton fabric (100 %) of plain weave was used as base material for fused systems. Biaxial tension testing was performed with three types of interlinings: woven, nonwoven and knitted, which differed not only in surface density, but in the density of adhesive layer, which was 52 and 76 dots/cm2, as well. The samples of fused systems were punched from the side of the main cotton fabric in order to maintain the same friction force between the punch and the specimen. Obtained results have shown that different number of force peaks, i.e. breakings is characteristic for different fused systems. For initial pre-tension from 0.0 % to 2.1 % the first breaking always appears in longitudinal direction irrespectfully to longitudinal or transverse pre-tension direction. It means that at low levels of pre-tension, e.g. 2.1 % it is possible to control the height of punching deformation, but not to change the location of critical stresses.
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