Abstract
The strip bi-axial tensile behavior of open lock stitched woven fabrics was measured by using an usuall Instron type tensile tester and a simple attachment, which constructed with a Teflon rod and a few parts.
The stitched samples were formed cylindrical by sewing along determined lines on the fabric corresponding to a generating line and a circumference one on the circular cylinder.
The data obtained from the experiments measured to the breakage of the stitched fabrics with tensile direction parallel or perpendicular to the seam line were analyzed by using the same mechanical model, of which details have been described in the previous paper.
In this experiments, the tensile behavior of a seam element may be analyzed on the assumption that the element construct with six straight threads and tensile strains of these threads in direction parallel to cylinder axis are the same to that of the fabric element.
Conventionally, in sewing for fabrics, it is necessary to increase the seam strength by way of balancing thread tensions of up and down sewing thread.
