This standard prescribes the method for conducting the Charpy impact test (V-notch and U-notch) on metallic materials to evaluate their impact toughness and absorbed energy. It specifies standard test piece dimensions, notch geometry, and the procedure for testing under controlled temperatures.
Specifies the method for conducting the Charpy impact test on metallic materials.
Quick Reference Values
Standard test piece length55 mm
Standard test piece cross-section10 mm x 10 mm
V-notch angle45 degrees
V-notch depth2 mm
Radius at base of V-notch0.25 mm
U-notch depth5 mm
Pendulum striking velocity5.0 to 5.5 m/s
Key Formulas
K = Absorbed energy (Joules) calculated from the difference in pendulum height before and after impact
Practical Notes
Notch preparation is highly critical; machining marks or improper root radii act as stress concentrators and can artificially lower the impact toughness value.
Always record the test temperature alongside the impact energy, as the ductile-to-brittle transition makes impact properties highly temperature-dependent.