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How to comduct Tear strength Test ?
2019/06/13
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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, bullet proof jackets, tents, worker jeans, sacks, aesthetic apparel and many more applications. This is also important in the industrial textiles where heavy duty work is performed.
The tensile strength of fabric was tested according to ASTM Standard – D1424. Here Elmendorf Tear strength Test Apparatus was used to calculate the tear strength of the fabric.
Materials & Equipment:
Scissor
Cotton fabric
Elmendorf's tearing tester
mm Scale
Test Procedure:
1、Cotton fabric was taken.
2、Warp and weft direction of the fabric was identified.
3、Two strips were cut from the fabric in both directions having dimensions of 100 x 63.5 mm.
4、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.
Results & Discussion:
Tear Strength
Weft-wise tear strength = 1575 Kg
Warp-wise tear strength = 2570 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. The fabric had a twill 4 x 1 weave design. 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.
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