Introduction to Fabric Tear Strength
Fabric Tear strength is the resistance of the fabric against tearing or force required to propagate the tear once it is initiated.
The tear strength is required in high-performance applications as well as in the conventional textiles i.e. in the industrial applications, bulletproof jackets, tents, worker jeans, sacks, aesthetic apparel, and many more applications.
This is also important in industrial textiles where heavy duty work is performed. High tear strength of textiles makes sure that the punctures in the fabrics don’t propagate easily.
A fabric tear when it is snagged by a sharp object and the immediate small puncher is converted into long rip by what may be a very small extra effort.
It is probably the most common type of strength failure of fabrics in use. It is particularly important in industrial fabrics that are exposed to rough handling. (E.g. Tents, Sacks, Parachutes, etc.) In some applications, low tear strength is required, e.g. Adhesive tape, bandages, etc.
Tear strength is the strength required to start or continue the tear in fabric under specific condition & tearing force is the required to continue a tear previously started in a fabric.
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.
- To know about tear tester and its parts.
- To determine the tear strength of the fabric.
- Elmendorf Tear Tester
- mm/cm Scale
Tear tester machine is completely made of stainless steel. It consists of a sector of pendulum pivoted on anti-friction ball bearings on a vertical bracket fixed on a rigid metallic bare.
The test specimen in shape of rectangular pieces is held between two jaws, one of which is mounted on the pendulum & other is mounted on the vertical arm.
The jaw clamps are mounted in such a manner that their holding forces are aligned with each other when the pendulum is locked in its raised position.
An adjustable knife is also mounted on the vertical arm. It is centered between the two brake release lever. This action causes the test specimen to tear right through.
The Testing strength is indicated on calibrated scale fettle on the pendulum by a fine point.
A set of calibrated check weights are supplied with the tester for verification calibration of the scale at 3200, 6400 & 12800gms capacities.
In order to increase the capacity of the tester from the 3200Gms augmenting weights of 6400gms & 12800gms are supplied as standard Accessories.
Working Principle of Elmendorf’s Fabric Tear Strength Tester
- Cotton fabric was taken.
- Warp and weft direction of the fabric was identified.
- Two strips were cut from the fabric in both directions having dimensions of 100 x 64 mm.
- The sample was then fixed in the jaws of the tearing tester.
- A cut of 20mm was made along the width of the fabric using the cutter in the tearing tester.
- By using falling pendulum of the tearing tester the fabric was tear and the readings were noted from the Elmendorf’s tester’s scale.
|Sr. No.||Warp-wise strength % of 3200/6400
and 12800gm. Capacity
|Weft-wise strength % of 3200/6400 and
Results and Discussion
Warp-wise tear strength = 2009.5 Kg
Weft-wise tear strength = 1753.6 Kg
The results show that the warp-wise tear strength of the fabric is more than that of the weft-wise tear strength of the fabric. This shows that the warp yarns are much more than that of the weft yarns, that’s why the warp yarn strength is much more than that of the weft yarn.
This experiment showed that the warp-wise tear strength of the fabric is greater; hence the fabric is more stable along the warp-wise direction.