I keep getting “Hooke's law and elastic limit” questions wrong in Mechanical Properties of Solids. What's the trap?
using Hooke's law up to fracture.
The usual trap: using Hooke's law up to fracture. How to avoid it: straight-line rule only inside the proportional range. Go back to the definition — For small deformation within the proportional limit, stress is proportional to strain. Beyond that range the graph need not remain linear, and beyond the elastic limit the body may not recover fully.
Key point
Hooke's law and elastic limit
Common mistake
using Hooke's law up to fracture.
Memory tip
straight-line rule only inside the proportional range.
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