Abstract
Bi-axial tensile behavior of woven fabrics sewn with open lock stitches was observed by using an Instron type tensile tester with a simple attachment made of a Teflon rod.
Specimens were made into circular cylinders by sewing along warps or wefts. The models mechanically equivalent to these sewn specimens were assumed by the same way as explained in the previous paper[1].
The experimental results were analysed on the assumption that the seam element consists of six straight threads, and when stretched, these yarns are extended with no slip against the fabrics into which the threads are sewn in.
The analysis gives that it is necessary to increase the seam strength by balancing both tensions of the needle thread and the bobbin thread.
