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Fabric Tensile Strength Test | Strip Strength Test | Grab strength test | Tearing strength test | Elmendorf Tear Test | Bursting strength | Textile Study Center
Home Textile Testing Fabric Tensile Strength Test | Strip Strength Test | Grab strength test | Tearing strength test | Elmendorf Tear Test | Bursting strength

Fabric Tensile Strength Test | Strip Strength Test | Grab strength test | Tearing strength test | Elmendorf Tear Test | Bursting strength

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Salima Sultana Shimo

Salima Sultana Shimo

Lecturer in Dept. of Industrial & Production Engineering at Bangladesh University of Textiles
Former Lecturer at Daffodil International University
Salima Sultana Shimo

Latest posts by Salima Sultana Shimo (see all)

Fabric Tensile Strength Test Methods

Tensile Strength Testing: This is referred to as a strength test where the load is applied along the direction of the test sample.

 Tensile strength test of fabric is divided into two groups-

  1. Strip test 
  2. Grab test.

Strip Strength Test:

  1. Five fabric samples are extended in a direction parallel to the warp and five parallel to the weft.
  2. The specimens are cut to a size of 2.5 inch in width and then removing threads from both edges until the width has been reduced to 2 inch.
  3. The test length should be 8 inch between the jaws and so enough extra length must be allowed for gripping in the jaws.
  4. Under optimum conditions, the specimen will be mounted centrally. Security gripped along the full width to prevent slipping.
  5. The load is applied uniformly across the full specimen width till the specimen tear out.
  6. If a test specimen breaks within 0.25 inch of the line of contact of either of the pairs of jaws at a load less than the average of normal breaks, the result should not be used in calculation.

 

Fabric Tensile Strength Test | Strip Strength Test | Strip Strength Test procedure | Grab strength test | Grab strength test procedure | Tearing strength test | Tearing strength test procedure | Elmendorf Tear Test | Elmendorf Tear Test procedure | Bursting strength | Bursting strength procedure | Hydraulic Bursting Tester | Hydraulic Bursting Tester test procedure | Textile Study Center | textilestudycenter.com


Grab Strength Test:

  1. At first we take specimen 4”x6”.
  2. Then the specimen is marked by a pencil at 1.5“from the edge of the specimen to assist in clamping it so that the same set of threads are clamped in both jaws.
  3. The two jaws are fixed on both side of the specimen from 1” edge. This means that only the central 1 inch of the fabric is stressed.
  4. The gauge length used is 3 inch and the speed is adjusted so that the sample is broken in 20 ± 3s.
  5. One jaw is fixed another jaws moveable.
  6. Then the moveable jaws start to move outwards till the specimen is tear out.

Fabric Tensile Strength Test | Strip Strength Test | Strip Strength Test procedure | Grab strength test | Grab strength test procedure | Tearing strength test | Tearing strength test procedure | Elmendorf Tear Test | Elmendorf Tear Test procedure | Bursting strength | Bursting strength procedure | Hydraulic Bursting Tester | Hydraulic Bursting Tester test procedure | Textile Study Center | textilestudycenter.com



Tearing Strength Test:

Tear Strength : Tear strength is the force required either to start or to continue the tear in a fabric under specific condition.

Tearing Force : Tearing force is the average force required to continue a tear previously started in a fabric.

Tearing Resistance : Tearing resistance is one of the important properties of a textile fabric. The tear resistance of a fabric indicates its resistance to tearing force.

Three Types of Tear Test :

  1. The tongue
  2. Trapezoid
  3. Elmendorf

Elmendorf Tear Test :

Sample Preparation:

  1. At first we take specimen (100X 75) mm2.
  2. The template is placed on the specimen & cut according to the template as fig. 
  3. A slit is created at the middle point at the specimen which range is 20 mm.
  4. In the test the Elmendorf continuous to tear the fabric from the end of the slit to the opposite edge a distance of 43 mm.
  5. Pendulum lever principle is used here.

Fabric Tensile Strength Test | Strip Strength Test | Strip Strength Test procedure | Grab strength test | Grab strength test procedure | Tearing strength test | Tearing strength test procedure | Elmendorf Tear Test | Elmendorf Tear Test procedure | Bursting strength | Bursting strength procedure | Hydraulic Bursting Tester | Hydraulic Bursting Tester test procedure | Textile Study Center | textilestudycenter.com



Fabric Tensile Strength Test | Strip Strength Test | Strip Strength Test procedure | Grab strength test | Grab strength test procedure | Tearing strength test | Tearing strength test procedure | Elmendorf Tear Test | Elmendorf Tear Test procedure | Bursting strength | Bursting strength procedure | Hydraulic Bursting Tester | Hydraulic Bursting Tester test procedure | Textile Study Center | textilestudycenter.com

Working Procedure :

  1. The apparatus consists of a sector-shaped pendulum carrying a moving sample clamp and the other clamp is fixed on the frame.
  2. When the pendulum is in the raised starting position, the specimen is fastened between the two clamps.
  3. The tear is started by a slit cut in the specimen between the clamps.
  4. The pendulum is then released and the specimen is torn as the moving clamp moves away from the fixed one.
  5. The pointer attached to the pendulum which is graduated to read the tearing force directly.

Bursting strength : This tear strength is basically used for knitted, lace, non-woven fabric, parachute fabrics, filters, sacks and nets etc. It is the uniformly distributed force over a given area applied to the fabric surface which is needed to break.

There are mainly two types of bursting strength test-

  1. Hydraulic or Diaphragm burst
  2. Ball burst

1. Hydraulic Bursting Tester: 



Procedure:

  1. The pressure in a liquid is exerted in all directions and advantage is taken of this phenomenon in the hydraulic bursting tester.
  2. The specimen S is clamped by a ring over a thin flexible rubber diaphragm D, which is clamped over a circular hole in the upper face of a reservoir.
  3. The liquid used may be water or glycerin.
  4. The hydraulic pressure is increased, by valves or screw driven piston and the diaphragm distends taking with it the specimen.
  5. At some point the fabric bursts, the pressure being indicated by the gauge G.
  6. Since the rubber diaphragm requires a certain pressure to stretch it, corrections may be made either by doing a blank test i.e. noting the pressure required to distend the diaphragm the same amount without the presence of fabric

More Testing Article :  Air Permeability by Shirley Air Permeability Apparatus 

Ref. Book-

  1. J.E. Booth

(4654)

Salima Sultana Shimo

Salima Sultana Shimo

Lecturer in Dept. of Industrial & Production Engineering at Bangladesh University of Textiles
Former Lecturer at Daffodil International University
Salima Sultana Shimo

Latest posts by Salima Sultana Shimo (see all)

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