Fabrics in use are rarely subjected to extensions in only one direction, though fabric load-extension testing is normally done in this way. A two-dimensional tester has been constructed with which load-extension curves for both weft and warp directions (or any other mutually perpendicular directions) are recorded simultaneously. The internal strain within the homogeneously strained portion at the center of the fabric is also recorded. The instrument is suitable for making measurements on both knitted and woven fabrics and on plastic hlm.
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