procedure charpy impact test

procedure charpy impact test

The Charpy impact test is one of the impact-testing that is used to determine the resistance towards a sudden load or impact. Impacted specimens with small fracture or with a very little plastic deformation is said to be in a brittle manner whereas fracture of a metal after extensive plastic deformation is said to be in a ductile manner. Brittle fracture looks clear, shinny with surfaces while ductile fracture looks grayish and fibrous.

Procedure:

1) A Charpy V-notch specimen is placed across parallel jaws in the impact-testing machine

2) The pointer is being set up to it’s maximum value (300 J)

3) The hammer is released from the initial height downward towards the sample

4) Observations and the energy absorbed is recorded and tabulated.

5) Step 1-3 is repeated for another type of metal

Results:

Steel	Energy Absorbed (Joule)
Mild steel	299.0
Carbon steel	21.0