Charpy Impact Testing
Victorian Testing & Inspection Services
Mechanical Testing, Charpy Impact Test
The Charpy impact test, also known as the Charpy v-notch test, is a standardised high strain-rate test which determines the amount of energy absorbed by a material during fracture. This absorbed energy is a measure of a given material's toughness and acts as a tool to study temperature-dependent brittle-ductile transition. This form of mechanical testing is widely applied in the industry.
The Charpy test involves striking a suitable test piece with a striker, mounted at the end of a pendulum. The test piece is fixed in place at both ends and the striker impacts the test piece immediately behind a machined notch.
At the point of impact, the striker has a known amount of kinetic energy. The impact energy is calculated based on the height to which the striker would have risen, if no test specimen was in place, and this compared to the height to which the striker actually rises.
Tough materials absorb a lot of energy, whilst brittle materials tend to absorb very little energy prior to fracture. Toughness tends to decrease as the test temperature decreases.
VTS are able to carry out material certification and charpy impact testing in accordance with Australian, ASTM, ISO and DNV Standards to temperatures as low as -196°c.
Charpy Impact Test
, Mechanical Testing
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