This method is mainly applicable to woven textile fabrics. It may be applicable to fabrics produced by other techniques. It is not normally applicable to woven elastic fabrics, geotextiles, nonwovens, coated fabrics, textile-glass woven fabrics and fabrics made from carbon fibres or polyolefin tape yarns. This method specifies a procedure to determine the maximum force of textile fabrics by a grab test method in standard atmosphere and/or in the wet state.
Grab test specimen preparation one set in the longitudinal direction and the other in the transverse direction. In principle a fabric test specimen is gripped in its centre part by jaws of specified dimensions is extended at constant rate of displacement until it ruptures. The maximum tensile strength only, of force and extension characteristics of the product is recorded. To record the test it is important to have a high speed intelligent test data logging rate. This is the transfer rate to the PC of 100Hz or more to capture and record all the data.
We use pneumatic action grips with rubber coated jaw faces for clamping of the material fitted to a tensile testing machine. While manual action grips will work, many of our users prefer the pneumatic action grips for ease of use, productivity, and better repeatability. Pneumatic action grips allow you to set a clamping pressure, while the manually operated grips depend on the operator's strength (which may not be so repeatable). We find that gripping pressure and specimen alignment are very important in these tests. Too much gripping pressure can produce premature breaks, while not enough gripping pressure can lead to specimen slippage or breaks at or near the jaws. These grips are usually fitted to single-column or dual-column table-top design. Bluehill 2 is used to input specimen details, set the desired test control, automatically calculate the desired results and statistics, and produce a test report all in accordance with the standard. For this test type, we use the preload feature of the Bluehill software to eliminate any slack in the specimen when loading into the clamping grips prior to test.
We suggest reviewing ISO13934-2 to fully understand the test fixture and results requirements prior to performing any tests.