How about the moment of inertia of two back to back channels? There is no formula,,,,.
This is not a specific formula, but generally in the mechanics of materials and engineering manual has a numerical physical quantity and the corresponding specific channel types, usually in combination just do a simple superposition or projections, specific to see you is the moment of inertia of the shaft on which. I hope it works for you
1, all kinds of channel section of the moment of inertia can be found in the materials manual. Usually two values of two axes through a centroid. In the two back to back cross section, the X axis of the cross center (with the upper and lower flange parallel axes) is added as long as the value is added. On the common boundary to convert back to back, not for any centroid axis of inertia moment = the centroid moment of inertia |+ cross-sectional area X centroid to the shaft of the vertical distance square. 2, if you have AutoCAD software, you can directly find any section of the inertial moments of graphics. 3, it is suggested that the textbook of mechanics of materials be turned over again. This is the basic skill.
There is no formula, and if each case has a formula, it's not called a formula. You first seek one of the moment of inertia, which requires you first determine an axis (can be set as X axis), calculate one, and then the two groove is symmetrical, and then calculate the total. The key is that you ask for a moment of inertia, you just have to find the center of gravity, the axis distance is good, directly into the formula to calculate the moment of inertia is it. This is a relatively simple question in material mechanics, come on! I hope you understand
Two people can add. Two moments of inertia are added together.
