AIM
To Determine the impact strength of steel by Charpy test
1. Impact testing machine
2. A steel specimen 10 mm x 10 mm X 55mm
2. A steel specimen 10 mm x 10 mm X 55mm
THEORY:
An impact test signifies toughness of material that is ability of material to absorb energy during plastic deformation. Static tension tests of unmatched specimens do not always reveal the susceptibility of a metal to brittle fracture.
PROCEDURE
1. With the striking hammer (pendulum) in safe test position, firmly hold the steel specimen in impact testing machines vice in such a way that the notch faces s the hammer and is half inside and half above the top surface of the vice.
1. With the striking hammer (pendulum) in safe test position, firmly hold the steel specimen in impact testing machines vice in such a way that the notch faces s the hammer and is half inside and half above the top surface of the vice.
2. Bring the striking hammer to its top most striking position unless it is already there, and lock it at that position.
3. Bring indicator of the machine to zero, or follow the instructions of the operating manual supplied with the machine.
4. Release the hammer. It will fall due to gravity and break the specimen through its momentum, the total energy is not absorbed by the specimen. Then it continues to swing. At its topmost height after breaking the specimen, the indicator stops moving, while the pendulum falls back. Note the indicator at that topmost final position.
5. The specimen is placed on supports or anvil so that the blow of hammer is opposite to the notch.
OBESERVATION
1. Impact value of - Mild Steel ------------N-m
2. Impact value of - Brass ------------N-m
3. Impact value of - Aluminum ------------N-m
1. Impact value of - Mild Steel ------------N-m
2. Impact value of - Brass ------------N-m
3. Impact value of - Aluminum ------------N-m
RESULT
i.The energy absorbed for Mild Steel is found out to be Joules.
ii. The energy absorbed for Brass is found out to be Joules.
iii. . The energy absorbed for Aluminum is found out to be Joules
ii. The energy absorbed for Brass is found out to be Joules.
iii. . The energy absorbed for Aluminum is found out to be Joules
PRECAUTION
1. Measure the dimensions of the specimen carefully.
2 Locate the specimen (Charpy test) in such a way that the hammer,
strikes it at the middle.
3 Note down readings carefully.
1. Measure the dimensions of the specimen carefully.
2 Locate the specimen (Charpy test) in such a way that the hammer,
strikes it at the middle.
3 Note down readings carefully.
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