19Selvedge strength test Clause Samples

19Selvedge strength test. A tensile test on mesh sample shall be carried out in order to estimate selvedge strength test. The test shall be carried out as per procedure outlined below. The selvedge strength shall be minimum 25 kN/m. a. Take a DT mesh of approximately 1.0 m width. b. The height of the sample shall be such that after selvedging on both the sides (1m), there shall be at least two mesh repetitions between the two selvedged wires, so that effective height of the sample shall be more than 300 mm. c. Sample shall be loaded on the UTM in a direction parallel to twist, with the samples being gripped at the two selvedged wires & not mesh twist. d. The distance between the two selvedge wires shall be recorded as Initial gauge length. e. Distance between the two end gripping points (pins) along the width of the sample shall be recorded as the unit width under test. The width shall be at least 700 mm. f. The load shall be applied gradually to the sample and the test be continued till the break point. g. The peak load and the % elongation shall be recorded. h. The strength of the selvedge connection shall be (peak load/unit width under test) expressed in kN/m.