To determined Shear strength of Steel
AIM: -To determined Shear strength of Steel.
OBJECTIVE: - To conduct shear test on specimens under single shear and double shear
APPARATUS: - Universal testing machine, Shear test attachment, Specimens
THEORY: - Place the shear test attachment on the lower table, this attachment consists of cutter. The specimen is inserted in shear test attachment & lift the lower table so that the zero is adjusted, then apply the load such that the specimen breaks in two or three pieces. If the specimen breaks in two pieces then it will be in single shear & if it breaks in three pieces then it will be in double shear.
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| Schematic universal testing machine |
PROCEDURE:-
1. Insert the specimen in position and grip one end of the attachment in the upper portion and one end in the lower portion.
2. Switch on the main switch of universal testing machine.
3. The drag indicator in contact with the main indicator.
4. Select the suitable range of loads and space the corresponding weight in the pendulum and balance it if necessary with the help of small balancing weights.
5. Operate (push) buttons for driving the motor to drive the pump.
6. Gradually move the head control level in left-hand direction till the specimen shears.
7. Down the load at which the specimen shears.
8. Stop the machine and remove the specimen
OBESERVATIONS:-
Diameter of the Rod, D = ….. mm
Cross-section area of the Rod (in single shear) =Ï€/4x d2 =….. mm2
Cross-section area of the Rod (in double shear) =
2x Ï€/4x d2 =….. mm2
Load taken by the Specimen at the time of failure, W =......N
RESULT:-
The Shear strength of mild steel specimen is found
i) In single shear = ….. N /mm2
ii) In double shear = ….. N /mm2
PRECAUTIONS:-
1. The measuring range should not be changed at any stage during the test.
2. The inner diameter of the hole in the shear stress attachment should be slightly greater than that of the specimen.
3. Measure the diameter of the specimen accurately.
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