The tear resistance test on fabrics or tear strength is measured to check how the material can withstand the effects of tearing or cuts when in tension. The tear strength is measured as per the ASTM D412 standard test method, which is also used to measure tensile and elongation.
The pendulum method (elmendorf test) is similar to the tongue tearing method and is in the family of fast tear strength test methods. The elmendorf tear test is commonly used. It can bet used for woven fabrics and also other fabrics that are produced with similar technology. However, this method can not be used for woven elastic fabrics, knitted fabrics, or any fabric that has the possibility of tearing transfer and has a great difference on weft and warp.
Instrument and Material
Pendulum fabric tear strength tester , steel ruler, scissors, a few pieces of fabric, etc.
Sample preparation
The sample is cut randomly in at least 3m from cloth edge, the length of which is no less than 1m. Got two sets of sample, and one is warp sample and the other is weft sample.
Test procedure
Pendulum’s quality is chosen to make sample test results fall in the range of 15%~85% of corresponding ruler. The zero position of machine should be calibrated, and pendulum is rose to the starting point.
The sample is clamped in the fixture. The long side of sample is parallel to top of fixture, while its bottom is placed in the base of the fixture. The opposite side of the groove is cut a notch of 20mm×0.5mm by a knife, leaving a tear length of 43mm×0.5mm.
Push “Stop”, and release the pendulum. When pendulum makes a backswing, you should grasp the pendulum to prevent the pointer position from damaging.
Read out data from measuring device, and ensure at least 5 times’ measurements in each direction.
The average value of tear strength from each test direction is calculated, keeping 2 valid figures.
-------------------------------------------------------------------
For more information about our testing instrument, please contact
·website:http://www.qinsun-lab.com/
· +86-21-6780 0179
· info@qinsun-lab.com
· or leave your comments below
The pendulum method (elmendorf test) is similar to the tongue tearing method and is in the family of fast tear strength test methods. The elmendorf tear test is commonly used. It can bet used for woven fabrics and also other fabrics that are produced with similar technology. However, this method can not be used for woven elastic fabrics, knitted fabrics, or any fabric that has the possibility of tearing transfer and has a great difference on weft and warp.
Instrument and Material
Pendulum fabric tear strength tester , steel ruler, scissors, a few pieces of fabric, etc.
Sample preparation
The sample is cut randomly in at least 3m from cloth edge, the length of which is no less than 1m. Got two sets of sample, and one is warp sample and the other is weft sample.
Test procedure
Pendulum’s quality is chosen to make sample test results fall in the range of 15%~85% of corresponding ruler. The zero position of machine should be calibrated, and pendulum is rose to the starting point.
The sample is clamped in the fixture. The long side of sample is parallel to top of fixture, while its bottom is placed in the base of the fixture. The opposite side of the groove is cut a notch of 20mm×0.5mm by a knife, leaving a tear length of 43mm×0.5mm.
Push “Stop”, and release the pendulum. When pendulum makes a backswing, you should grasp the pendulum to prevent the pointer position from damaging.
Read out data from measuring device, and ensure at least 5 times’ measurements in each direction.
The average value of tear strength from each test direction is calculated, keeping 2 valid figures.
-------------------------------------------------------------------
For more information about our testing instrument, please contact
·website:http://www.qinsun-lab.com/
· +86-21-6780 0179
· info@qinsun-lab.com
· or leave your comments below
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