The measured impact value determines the toughness and brittleness of the steel at a particular temperature.
The impact test (Charpy)
The impact test determines the toughness/brittleness of the metal at a particular temperature. This test can be conducted at -40, -20, 0 or 20 degrees Celsius, for example.
A notch is created in a normalised block of steel. This block is then brought to the desired test temperature and placed in an impact pendulum. A so-called drop hammer mounted on a pendulum then strikes the block at the notched position.
The block breaks, absorbing energy (fracture energy). This energy is then used to determine the impact value in joules.
The impact value can change after a change of temperature into the steel.
The impact test results provide information for applications in the following sectors:
→ Steel structures in construction → Shipping → Road safety
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