Question:
An engineer needs a material for springs with minimal permanent deformation under load. Which property - alloy combination best satisfies this requirement?
An engineer needs a material for springs with minimal permanent deformation under load. Which property - alloy combination best satisfies this requirement?
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Spring materials are chosen based on yield strength, not just hardness.
Updated On: Jun 29, 2026
- High ductility - electrolytic copper
- High yield strength - beryllium copper
- Moderate strength - cartridge brass
- Low elongation - leaded brass
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The Correct Option is B
Solution and Explanation
Concept:
Spring materials must exhibit:
• high yield strength
• high elastic limit
• ability to store elastic energy
• minimal plastic deformation
Step 1: Requirement for springs.
For minimal permanent deformation: \[ \sigma_y \text{ should be high} \] This ensures deformation remains elastic.
Step 2: Evaluate materials.
• Copper → too soft
• Brass → moderate strength
• Leaded brass → brittle and unsuitable
• Beryllium copper → high strength + good elasticity Final Answer: \[ \boxed{\text{High yield strength - beryllium copper}} \]
• high yield strength
• high elastic limit
• ability to store elastic energy
• minimal plastic deformation
Step 1: Requirement for springs.
For minimal permanent deformation: \[ \sigma_y \text{ should be high} \] This ensures deformation remains elastic.
Step 2: Evaluate materials.
• Copper → too soft
• Brass → moderate strength
• Leaded brass → brittle and unsuitable
• Beryllium copper → high strength + good elasticity Final Answer: \[ \boxed{\text{High yield strength - beryllium copper}} \]
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