ISO 148-1: Metallic materials — Charpy pendulum impact test — Part 1: Test method
1. Purpose
Provides the Charpy pendulum impact test method to determine the impact resistance of metallic materials.
Helps evaluate impact toughness and the ability to absorb energy when the material fractures under impact.
2. Test principle
A metallic specimen of standard dimensions with a notch is placed horizontally on the supports.
The Charpy pendulum hammer is released from a defined height to break the specimen.
The absorbed energy (measured in Joules) during fracture is recorded.
3. Specimen characteristics
Standard dimensions: 10 × 10 × 55 mm.
Types of notches: V-notch, U-notch, depending on the test purpose.
4. Measured parameters
Absorbed impact energy.
Fracture appearance: ductile fracture, brittle fracture, or mixed.
Tests can be conducted at different temperatures to determine the ductile-to-brittle transition temperature.
5. Applications
Widely used in the steel industry, mechanical engineering, welded structures, and machine manufacturing.
Helps determine the impact strength of materials before use in harsh environments (low temperatures, dynamic loads).
Summary: ISO 148 specifies the Charpy impact test method for metallic materials, assessing absorbed energy and fracture type to determine impact toughness and the behavior of materials under dynamic loading.
