The Charpy impact test used to determine the resistance capacity of metal (steel) specimen against sudden impact load of a pendulum which swung from a certain height.
The other name of the Charpy impact test is the Charpy V-notch test because of the specimen used in this test cut at a certain depth in ‘V’ shape.
The Charpy impact test is performed to measure the required amount of energy to break a metal piece by the force of pendulum weight.
Materials that break without plastic deformation (no energy absorption) is known as a brittle material. Material breaks with large plastic deformation (little energy absorption) are known as ductile material.
The size of the sample should be 55mm x 10mm x 10mm and should have a depth of 2mm notch at centre.
The amount of energy absorbed by the test specimen to break is called Knotch impact energy.
The Knotch Impact Energy KV = mgH – mgh
m – Mass of the Pendulum
H – Height of Pendulum starting point
g – Gravity
h – Height of the pendulum from the first reversal point
The test has to be applied on a minimum of three specimens from the same batch.
Specimen | Impact energy in Joules |
Sample 1 | |
Sample 2 | |
Sample 3 |
The test is conducted to find whether the material is brittle or ductile. The brittle material absorbs less amount of energy, and ductile material absorbs large amounts of energy.
Happy Learning 🙂
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