Testing Principle

The principle of tearing strength is fabric tearing, also known as tearing, fabric local yarns are subjected to a concentrated load, so that the phenomenon of fabric tearing. Fabrics in the process of use, clothing hooked by the object, the local yarns are pulled off, so that the fabric forms a strip or triangular cracks, which is also a kind of fracture phenomenon.

Test Standard

Impact pendulum method GB/T 3917.1-2009, ISO 13937.1: 2000 and ASTM D 1424-09 (2013);

Trouser method GB/T 3917.2-2009, ISO 13937.2: 2000 and ASTM D 2261-2013;

Trapezoidal method GB/T 3917.3-2009.

Test Methods

There are two test methods: the impact pendulum method and the trouser specimen method.

Impact Pendulum Method

The test of tearing strength is to fix the specimen on the fixture, cut the specimen into an incision, and release the pendulum in the position of maximum potential energy, when the movable fixture leaves the fixed fixture, the specimen will be torn along the direction of the incision, and the work done to tear the fabric of a certain length will be converted into the tearing force. The test standard is GB/T 3917.1-2009 “Textiles Tearing Performance of Fabrics Part 1: Determination of Tearing Strength by Impact Pendulum Method”. This method is mainly used for the testing of denim garments in daily testing.

Trouser Method

The two legs of the trouser specimen are clamped so that the specimen notch line is straight between the upper and lower clamps. The instrument is switched on to apply the tensile force in the direction of the cut, the tearing strength is recorded until it is torn to the specified length, and the tearing strength is calculated by an electronic device.

Improvement Measures

1. Blending with high-performance fibres to improve the tearing performance of fabrics by increasing yarn strength.
2. Improve the warp and weft density of the fabric, increase the flexural wave height, increase the number of yarns in the force triangle of the fabric in the tearing process, and improve the tearing performance of the fabric by increasing the weaving shrinkage of the yarns and the number of force roots.
3. Change the fabric organisation to improve the moving ability of yarns in the organisation during the tearing process, and improve the tearing performance of fabrics by increasing the number of yarn roots under force.

Test Apparatus

The ElmenGuide Elmendorf tearing strength tester, also known as the Pendulum Tearing Tester, do the bursting test by using a pendulum tearing method. It is mainly suitable for woven fabrics, but also for other textiles produced by other technologies, such as non-woven fabrics.