CHARPY IMPACT TEST
Objective:
To find the impact resistance of mild steel.
Apparatus used:
Impact testing machine
STEP
1
Test for friction loss is conducted by adjusting the pointer to 300 Joules, then the pendulum is released by operating the lever without keeping the specimen.
Loss of energy due to friction Ef = _____ J
0.000
0.000
STEP
2
The Charpy test specimen as per Indian standard IS:1499-1977 is used to conduct the test.
STEP
3
Select the charpy test specimen.
Selected specimen :
Cast Iron
Mild Steel
Cast Iron
Mild Steel
| Length L (mm) | |
| Breadth B (mm) | |
| Depth D (mm) | |
| Depth of Notch-d (mm) |
| Length L (mm) | |
| Breadth B (mm) | |
| Depth D (mm) | |
| Depth of Notch-d (mm) |
STEP
4
The Charpy test specimen is placed in position as shown.
Drag the specimen
Drop here
STEP 5
The pendulum is released by operating the lever. The hammer strikes against the specimen and breaks it.
0.000
0.000
Topview of the anvil with specimen placed
Observations:
| Trial | Material | Loss of energy due to frictionEf ( J ) | Total loss of energy during transit of Hammer Et ( J ) | Energy for failure of specimen = Et - Ef ( J ) | Average of energy for failure of specimen ( J ) |
| 1 | |||||
| 2 | |||||
| 3 |
Trial =
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