Question:
In Dynamic hardness testing, the hardness is measured by
In Dynamic hardness testing, the hardness is measured by
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Dynamic hardness tests are energy-based, not indentation-size based.
Updated On: Jun 29, 2026
- Size of the permanent indentation produced under a static load
- Resistance to plastic deformation
- Energy of impact
- Diagonal length of the indentation by a pyramidal indenter
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The Correct Option is C
Solution and Explanation
Concept:
Dynamic hardness testing measures hardness based on the behavior of a material under impact loading rather than static loading.
Step 1: Understand dynamic hardness.
In dynamic hardness tests:
• an indenter is dropped or impacts the surface
• energy absorption is measured
• hardness is related to energy loss or rebound behavior
Step 2: Key measurement parameter.
Hardness is determined using: \[ \text{impact energy absorbed or rebound energy} \] Thus, it depends on energy of impact.
Step 3: Evaluate options.
• (A) static indentation → Brinell/Vickers
• (B) general definition, not specific measurement
• (D) Vickers hardness
• (C) correct dynamic basis Final Answer: \[ \boxed{\text{Energy of impact}} \]
Step 1: Understand dynamic hardness.
In dynamic hardness tests:
• an indenter is dropped or impacts the surface
• energy absorption is measured
• hardness is related to energy loss or rebound behavior
Step 2: Key measurement parameter.
Hardness is determined using: \[ \text{impact energy absorbed or rebound energy} \] Thus, it depends on energy of impact.
Step 3: Evaluate options.
• (A) static indentation → Brinell/Vickers
• (B) general definition, not specific measurement
• (D) Vickers hardness
• (C) correct dynamic basis Final Answer: \[ \boxed{\text{Energy of impact}} \]
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