Figure 5. Case 6: Curvy tree branch model, where yt is the height of the branch on top of the axis,yb is the height below the axis

From

Mechanical Stress Analysis of Tree Branches

Zahra Shahbazi, Allison Kaminski, Lance Evans

American Journal of Mechanical Engineering. 2015, 3(2), 32-40 doi:10.12691/ajme-3-2-1