Question

Which of the following test is used to measure the toughness of a material?

• A. Brinell test
• B. Shore Scleroscope test
• C. Charpy test
• D. Compression test

Hint:

Remember: Hardness is about "Indentation" (Brinell/Shore), while Toughness is about "Impact" (Charpy/Izod). If you see a pendulum involved, it's testing for toughness.

Answer 1

The Correct Option is C

1. The Charpy Impact Test: The

Charpy test is the standard method for measuring toughness. It involves a weighted pendulum that is released from a known height to strike a notched specimen of the material.

• Energy Absorption: The height to which the pendulum rises after breaking the specimen is measured. The difference in potential energy before and after the strike represents the "impact energy" absorbed by the material.

• Units: The result is usually expressed in Joules (J).

2. Evaluating Other Tests:

• Brinell Test: A

Hardness test that uses a heavy load and a steel/carbide ball to indent the surface.

• Shore Scleroscope: Another

Hardness test that measures the rebound height of a diamond-tipped hammer.

• Compression Test: A test used to find the

Compressive Strength and deformation behavior of a material under a crushing load.

3. Importance of Toughness: Toughness is vital for components that may experience sudden shocks, such as gears, chains, and structural beams in seismic zones. A "tough" material will bend or dent rather than snapping unexpectedly.