New aspects of polymeric sheet punch deformation

Abstract

Two methods of punch deformation of flat polymeric materials have been studied and compared between themselves. The areas of the method application for the determination of fabric mechanical and exploitation stability and also the suitability of methods for the evaluation of effectiveness of technological treatment with liquid chemical softeners have been analyzed. The geometrical and mechanical behavior of flat polymeric materials (woven and knitted fabrics) during pulling of a disc-shaped specimen through a central hole of KTU-Griff-Tester has been analyzed on the basis of pulling parameters.

Triboelectricity in the pairs of polymeric materials

“…Thus the accuracy of determination of the dynamic friction coefficient μ D according to the standard DIN 53375 when the sliding pair (the specimen and the stand) is two different dielectrics encounter with some metrological problems. There are also materials testing devices11 where the fibrous polymer sample slides in regard to different dielectrics. In this case the adhesive bond due to triboelectricity may have also impact on the data accuracy.…”

“…Selection of stands (glass (G) and organic glass (OG)) is identical to the material of components (with regard to which the specimen is sliding within the test period) of widely described device KTU‐Griff‐Tester designed for research of mechanical properties of polymeric materials 8–10…”

Evaluation of the influence of chemical softening on the properties of cellulose-origin textiles

“…washing, cleaning, chemical softening, etc.) (Daukantienė, Bernotienė, & Gutauskas, 2006;Daukantienė, Zmailaitė, & Gutauskas, 2005; Juodsnukytė, Daukantienė, Abraitienė, & Gutauskas, 2005;Truncytė, Daukantienė, & Gutauskas, 2007). The device called KTU-Griff-Tester ( Figure 1) registers pulling curve (pulling deformation/pulling force) H-P.…”

“…The process implies low time input for specimen preparation that is independent of material direction (warp/wale and weft/course) and reduces the number of test results. Furthermore, it is meaningful and reflects anisotropy of the material properties that is obvious from the geometrical shape of a deformed disc-shaped specimen (Daukantienė et al, 2003;Daukantienė, Zmailaitė et al, 2005;Daukantienė et al, 2006;Juodsnukytė et al, 2005;Strazdienė et al, 2003;Strazdienė & Gutauskas, 2006;Truncytė & Gutauskas, 2005;Truncytė & Gutauskas, 2006;Truncytė, Papreckienė, & Gutauskas, 2007;Valiukėnaitė, Papreckienė, & Gutauskas, 2010). Initial conditions of an experiment were chosen by thickness δ of textiles.…”

“…Changes in surface density of textiles as well as in thickness ratio (Δδ) were also considered (Daukantienė et al, 2006;Strazdienė & Gutauskas, 2006;Truncytė & Gutauskas, 2005). The number of specimens varied from 6 to 10 in a test specimen group.…”