The Mechanical Engineering Handbook
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Ductility (% Elongation)

Ductility (% Elongation) Equation


$$ E = \frac{L_f - L_0}{L_0} \cdot 100 $$ where:

E   =   Percentage Elongation   (%)

Lf   =   Final length after fracture   (m)

L0   =   Original Length   (m)


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Equation Assumptions


  • The material behaves linearly and elastically.
  • Deformations are small (for large strains the linear relationship between shear stress and strain may not hold).
  • Material is homogeneous.
  • The material is isotropic.