Which test would provide a quick estimate of hardness by observing material behavior under tensile loading?

Which test would provide a quick estimate of hardness by observing material behavior under tensile loading?

• A. Tensile test
• B. Bending test
• C. Hardness test
• D. Impact test

Answer: (A)

Hardness reflects how resistant a material is to permanent deformation, and there’s a practical link between hardness and strength. A tensile test gives you the stress-strain response, from which you obtain yield strength and ultimate tensile strength. Because harder materials usually exhibit higher strength, you can use those tensile properties to estimate hardness quickly without an indentation test. The bending test mainly probes flexural behavior and doesn’t directly translate to hardness. An indentation hardness test measures hardness directly, and an impact test assesses toughness, not hardness. So, using a tensile test to read off strength data provides the fastest, reasonable estimate of hardness.