I keep getting “Stress and strain” questions wrong in Mechanical Properties of Solids. What's the trap?
giving strain the unit metre.
The usual trap: giving strain the unit metre. How to avoid it: stress is cause per area; strain is fractional response. Go back to the definition — Stress measures internal restoring force per area; strain measures fractional deformation. Stress has pressure units, while strain is dimensionless.
Key point
Stress and strain
Common mistake
giving strain the unit metre.
Memory tip
stress is cause per area; strain is fractional response.
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