Material issue of the external pressure reinforcement ring
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Is the calculation for the external pressure reinforcement ring independent of the material of the reinforcement ring? For example, if the cylinder material is Q345R, Q235A can be used for the reinforcement ring?
The cylinder is made of Q345R, and the material for the reinforcement rings from the Q235 series is perfectly suitable. Of course, it depends on the cross-sectional dimensions of the steel sections used in the design; generally, standard steel sections are chosen. If welded steel sections are used, steel plates that are compatible with the material of the cylinder can be selected for welding. There is also the issue of operating temperature here; above 200°C, it is better to use Q345R welded sections or finished Q345 steel profiles.
For ordinary steel sections, 235A is sufficient
I can’t explain exactly why, but something feels off... To put it another way, if it has nothing to do with the material of the reinforcement ring, then could non-ferrous metals or non-metals be used?
For welded steel sections, the material should be the same as or similar to that of the main structure; there is certainly no problem using Q345R alongside Q235.
Of course, it would be wrong to say that the reinforcement ring has nothing to do with the material of the main body, haha.
I wonder which standard, manual, textbook, or book provides a more detailed discussion...
The material of the reinforcement ring only needs to have good weldability with the shell it is reinforcing, and to be able to withstand external pressures together with the shell; if it is an internal reinforcement ring, corrosion resistance also needs to be considered.
Regular containers are used in this way, as supports or skirt bases. I really didn’t pay attention to where it came from; sorry!
It’s basically irrelevant. The combined moment of inertia of the reinforcement ring and the shell wall thickness must meet the calculation requirements. Unless it is a larger reinforcement ring, the ring itself must be stable and must not suffer any loss of strength or stability; that’s when it becomes relevant.