Simulation of Clothing Pressure in Wear by Strip Bi-Axial Extension of Circular Sewn Fabrics

Abstract

An external pressure applied on a circular sewn fabric by longitudinal stretching was measured by using an Instron type tensile tester and by a thin walled circular cylinder with a narrow slit. The outer surface of the cylinder is coated by Teflon resin and two sets of strain gauge are fixed to the inner surface at the opposite side of the slit.A sewn fabric whose peripheral length is as same as that of the circumference of the thin walled cylinder was put on this cylinder. Bending moment was applied to the thin walled cylinder by stretching the sewn fabric along the cylinder axis. If the dimensions of the thin walled cylinder are known, the external pressure can be obtained from the bending moment measurement.Assuming that a human body is formed of a hard circular cylinder, an external pressure obtained in this experiments may be related with a clothing pressure in wear.Comparing two experimental results of woven fabrics to those of knitted fabrics at the same tensile strain, it was concluded that an external pressure of woven fabrics are higher than those of knittel fabrics.