Now the specimen is placed over the diaphragm property and the specimen clamp is tightened by turning round clamp clockwise direction by using special tool supplied by instrument manufacturer.
Now the electric supply of the hydraulic pump switches on. The fluid pressure begins to increase constantly. After a certain interval of time, the test specimen gets ruptured. The distance between clamped diaphragm and the top surface of the inflate diaphragm is measured precisely. The reading of the pressure gauge is also recorded at the same time. This pressure gauge reading is called pressure required to rupture a specimen( P)
The developed hydraulic pressure inside the pressure cylinder is released immediately and the specimen clamp is loosened at the same time.
Now we find the pressure required to inflate diaphragm. The diaphragm is tightened again by circular clamp without test specimen. The electrical supply is switched on. The diaphragm starts to expand. When the top surface of the diaphragm reaches to the height equal to the height reached during rupture of the specimen, the pressure gauge reading is recorded again immediately. This pressure is called inflate pressure ( P ' ).
Calculation of bursting strength:
1 - The specimen should be prepared precisely.
2 - The height of the inflate diaphragm should be measured correctly during rupture of the specimen.
3 - The pressure must be released immediately after rupture of specimen.
4 - The diaphragm should be replaced after recommend time.
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