# Note

### Quick Note for Elongation Calculation

Elongation formula The relationship between stress and strain is: $Young Modolus = \frac{{stress}}{{strain}}$ $E = \frac{\sigma }{\varepsilon } = \frac{{\frac{P}{A}}}{{\frac{{\Delta L}}{L}}} = \frac{{PL}}{{A\Delta L}}$ Therefore, the elongation is calculated based on: $\Delta L = \frac{{PL}}{{EA}}$ The elongation of tendon is equal to summary of element elongation at all curvature of tendon $\Delta {L_i} = \frac{{P_a^i.X_i}}{{EA}}$ The total expected elongation of tendon $\Delta L = \sum\limits_{i = 1}^n {\Delta {L_i}}$