What Is the Charpy Impact Test?

The Charpy impact test is a test used to determine the notch sensitivity (toughness) of metallic materials. Prepare a metal sample with a certain shape and size so that it has a U-shaped notch or a V-shaped notch. It is in a simple supported beam state on a Charpy impact tester. A pendulum lifted by the tester is used to make an impact to make the The notch is punched out, and the absorbed work of the sample is calculated by using the height difference of the pendulum to rise again when broken, which is Aku and Akv. Impact tests can be performed at different temperatures. A large absorbed work value (Joule) indicates that the material has good toughness and is not sensitive to gaps or other stress concentrations in the structure. In recent years, materials with important structures tend to use V-notch specimens that can better reflect the notch effect for impact testing.

Charpy impact test

Standard Chinese name Metallic Charpy Impact Test Part 1: Test Method

Scope of application Applicable to Charpy impact (V-shaped notch and U-shaped notch) samples of metal materials to measure the impact absorption energy.

Test principle Under specified conditions (including high temperature, room temperature and low temperature), a Charpy notched impact sample is hit by a pendulum at one time, and the energy absorbed by the impact is measured.

Measurement of performance parameters V-notch impact absorption energy: KV U-notch impact absorption energy: KU

Reference standard EN 10045-2: Charpy impact tests on metallic materials. Part 2: Calibration of testing machines

Test procedure 1) Check the test equipment and instruments before the test; 2) Heat or cool the sample to the specified temperature and keep it warm; 3) Center the sample; 4) Release the pendulum to hit the sample once and record the absorbed energy;

Results and test report European standard number; material name, sample identification; sample size; notch type; test temperature; nominal impact energy of pendulum; absorbed energy KV, KU;

There are more laboratories that can perform Charpy impact tests, and all steel and steel mills can do it.