I would like to ask about the algorithms for calculating moment of inertia and inertial torque
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This post was last edited by manschy on 2016-5-18 at 18:08. In the stress calculation report for a certain pipeline project, the cross-sectional properties of the pipe are as follows: Outer diameter of the pipe, Do = 1067 mm; Wall thickness = 21.30 mm; Inner diameter, Di = 1024 mm; Cross-sectional area of the pipe’s shell, A = 69953.84 mm2; Moment of inertia, Ixx = Iyy = 9.56E+09 mm4; Torsional inertial moment, J = 1.91E+10 mm4. Design pressure = 9.65 MPa; Hydrostatic pressure = 14.48 MPa (pressure used for hydrostatic testing). Question: How are the moment of inertia and the torsional inertial moment determined? It seems that the torsional inertial moment is twice the moment of inertia. :'(
Translate Mechanics of Materials – there are too many formulas to remember
Thank you, your answers are always spot-on
Expert, I checked the textbook on mechanics of materials and couldn’t find this formula; I earnestly request further assistance. Thank you!
The torsional moment of inertia should be the sum of the two moments of inertia; the moment of inertia is calculated through integration
Could you specify the formula a bit more, or suggest which book to read? Uploading an attachment would also work. Thank you
Song Keke’s Industrial Pipeline Stress Analysis and Engineering Applications, pages 4 and 5. Go and see for yourself.