Question

The maximum energy that a given component can absorb without undergoing any permanent deformation up to elastic limit is known as

• A. Hardness
• B. Toughness
• C. Resilience
• D. Proof resilience

Hint:

Differentiate the energy terms using the stress-strain curve:
- Modulus of Resilience: Area under the curve up to the yield point (a material property).
- Proof Resilience: Total energy stored up to the elastic limit (for a specific component).
- Toughness: Total area under the entire curve up to fracture.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The question asks for the term describing maximum strain energy absorbed within the elastic limit.

Step 2: Key Concept (Alternate):
Strain energy per unit volume = area under stress-strain curve. Up to elastic limit, maximum area = proof resilience. Modulus of resilience = proof resilience per unit volume.

Step 3: Detailed Explanation:
Resilience = energy absorbed elastically and released on unloading. Proof resilience = maximum resilience at elastic limit (just before permanent deformation starts). Toughness = total energy till fracture (includes plastic region). Hardness = surface resistance to indentation, unrelated to energy absorption.

Step 4: Final Answer:
Proof resilience is the maximum energy absorbed up to elastic limit without permanent deformation.