Seeking advice on stress synthesis problems
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I have a question regarding stress synthesis: for the synthesis of thrust P, we know that it is the square root of the sum of the squares of P in the X, Y, and Z directions. As for stress, it seems that in C2, the stresses in each direction are simply added together to obtain the total combined stress. I don’t quite understand the difference between the two methods; I hope experts can provide detailed explanations.
I’m not familiar with C2 software, so I don’t know its specific handling methods. Logically, force is a vector, so it’s fine to take the square root of the sum of squares to find the resultant force. For stresses in different directions, the principal stresses should be determined using 2D or 3D stress, and then the equivalent stress can be calculated using strength theories. The approach of simply adding them together seems inappropriate to me.
C2 software is not a simple addition. In fact, it is not determined by the C2 software; rather, the C2 software calculates it based on relevant standards. For metal pipes, calculations are generally carried out according to the fourth strength theory. Taking ASME31.3 as an example, the stress is related to the axial stress, bending stress, and torsional stress at that node. For specific calculations, refer to ASME31.3.