What property describes a material's ability to resist permanent deformation under load?

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Study for the Ontario Power Generation (OPG) Orange 1 Test. Ace your exam with multiple choice questions and detailed explanations. Prepare confidently!

Multiple Choice

What property describes a material's ability to resist permanent deformation under load?

Explanation:
The property described is yield strength. It measures the stress level at which a material begins to deform plastically, meaning the deformation after unloading becomes permanent. Below yield strength, deformation is elastic and reversible; beyond it, permanent changes remain. Elastic modulus relates to stiffness and elastic deformation, tensile strength is the maximum stress before fracture, and hardness is resistance to indentation. Hence, yield strength best captures the resistance to permanent deformation under load.

The property described is yield strength. It measures the stress level at which a material begins to deform plastically, meaning the deformation after unloading becomes permanent. Below yield strength, deformation is elastic and reversible; beyond it, permanent changes remain. Elastic modulus relates to stiffness and elastic deformation, tensile strength is the maximum stress before fracture, and hardness is resistance to indentation. Hence, yield strength best captures the resistance to permanent deformation under load.

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