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ASTM D5587 Trapezoid method tearing strength test test method

by:GESTER Instruments     2021-07-11
The ASTM D5587 standard specifies the use of trapezoidal specimens to determine the tear strength of non-woven fabrics. This standard can be applied to the resistance to continuous tearing of a variety of textiles, such as resistance to tearing by foreign objects such as steel nails or bolts. The sample is cut into an equal trapezoid, and a notch is cut on the short side. The sample is clamped in the tool, and as the upper and lower tools are separated, the notch cut at the short side of the sample is torn. Continuously record the force-displacement data of the sample, and finally calculate the trapezoidal tear strength. There are two calculations for the tear strength: one is the maximum value of a single peak, and the other is the average of the five maximum peaks. For this test, the data The collection rate is recommended not to be less than 500Hz.. Prepare samples for fabrics and elastic fabrics with low elongation, and cut 5 samples in the warp and weft directions according to the standard requirements. Set the upper and lower clamp spacing of 25mm, and the stretching speed of 100mm/min; select a suitable sensor so that the force value of the tearing force falls between 10% and 90% of the full scale of the sensor. Clamp the sample along the non-parallel sides of the trapezoid, place the cut between the upper and lower clamps, and keep the cut on the short side tight and the long side in a wrinkled state. Start the Instron universal material tester, the electronic recording device automatically records the tearing force value and the clamp displacement, and draws the displacement-load curve. Determine the specific value interval on the measured displacement-load curve according to the proposed value scheme, calculate the average value of all peaks in the current interval, and use this average value as the current trapezoidal tear strength value of the sample. Take the average value of 5 samples as the current sample’s trapezoidal tear strength in one direction. The aspect ratio of the clamping surface required for the trapezoidal tear strength test is at least 2 x 3 inches. The clamp used for the test is recommended to be pneumatically pushed, which can effectively prevent the specimen from slipping. We also recommend the use of Instron single column or double Column electronic universal testing equipment. Because Instron Bluehill 2 application software package can provide proper control, accurate calculation of tear strength results and establishment of effective reports. Finally, users are reminded to read the standards before conducting any tests. And fully understand all the requirements. More about tear strength testing machine: http://www.shuzisipo.com/productlist/list-5-1.html
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