The Charpy impact test primarily measures which property?

The Charpy impact test primarily measures which property?

• A. Hardness
• B. Toughness
• C. Tensile strength
• D. Ductility at elevated temperature

Answer: (B)

The main concept tested is impact toughness—the material’s ability to absorb energy before fracturing under a sudden, high-rate load. In the Charpy test, a notched specimen is struck by a pendulum, and the energy required to fracture it is measured. This absorbed energy reflects notch toughness: materials that absorb more energy tend to be tougher and exhibit more ductile behavior under impact, while those that crack with little energy are more brittle. This isn’t a test of hardness (which comes from indentation tests) or tensile strength (which comes from a static pull to failure). Ductility at elevated temperature can be explored with Charpy at different temperatures, but the primary property it assesses is toughness.

The main concept tested is impact toughness—the material’s ability to absorb energy before fracturing under a sudden, high-rate load. In the Charpy test, a notched specimen is struck by a pendulum, and the energy required to fracture it is measured. This absorbed energy reflects notch toughness: materials that absorb more energy tend to be tougher and exhibit more ductile behavior under impact, while those that crack with little energy are more brittle. This isn’t a test of hardness (which comes from indentation tests) or tensile strength (which comes from a static pull to failure). Ductility at elevated temperature can be explored with Charpy at different temperatures, but the primary property it assesses is toughness.