Combined load calculation
Lets see if I have the problem correct.
You have a round tube of know diameter, wall thickness, and length.
The applied loads are torsional (twisting at both ends) and one (just for concept) vertical load and at some point between the ends and one horizontal load at some point between the ends.
Correct so far?
The next question is how is the tube supported?
Since this is a combined load you will need to solve in the following order:
1. Draw Free Body Diagram
2. Find Reactions
3. Shear Diagram
4. Bending Moment Diagram
5. Find bending stress
6. Find vertical shear stress
7. Find Critical Points
8. Using Mohr's circle find max Principal stress
9. Failure Analysis using max shear stress theroy or the distortion energy theory
10. Then check for deflection
This is for a ductile material under a static load - if its brittle or under a cyclical load then step 9 changes.
All in the day of the life of a ME