Polar moment of inertia
Input(s)
\(J_{b}\): Polar Moment of Inertia of Pipe Body \(\left(\mathrm{ft}^{4}\right)\)
\(J_{j}\): Polar Moment of Inertia of Tool Joint \(\left(\mathrm{ft}^{4}\right)\)
L: Length of Pipe \((\mathrm{ft})\)
1: Joint Tool Length (ft)
Output(s)
\(J_{p}\): Polar Moment of Inertia of Pipe \(\left(\mathrm{ft}^{4}\right)\)
Formula(s)
\[
J_{p}=\frac{J_{b} * J_{j}}{\left(\frac{L-l}{L}\right) * J_{j} *\left(\frac{l}{L}\right) * J_{b}}
\]
Reference(s)
Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015. Houston, Texas, Page: 356.