Old 08-04-19, 03:40 PM
  #38  
terrymorse 
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Originally Posted by Road Fan View Post
It's not also based on moment of inertia?
Moment of inertia is only relevant for bending and twisting (torsion), not elongation (strain).

ε (strain) = σ (stress) / E (Young's modulus)

If you double the cross sectional area, you half the stress, and thus the strain.
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