I’m asking experts: what’s the deal with the support lines at both ends of a conical shell subjected to external pressure?
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Use the major end as a support line, and the moment of inertia can be calculated. The minor end does not serve as a support line, and its thickness can still be taken into account. Is this okay?
The small-end cylinder is equipped with rigid ring-type supports (with shims); can it be considered a reinforcement ring?
Regarding the issue of support lines, the standard explanation is that it is up to the designer to decide whether a conical section should serve as a support line. When can a support line be drawn? In simple terms, it refers to structures such as the connecting cylinders and conical sections; under the same conditions, other parts fail first. Therefore, during the design process, designers must decide on their own whether it can be used as a support line, based on the specific design conditions; generally, it can be considered an option when the half-cone angle is greater than 30°. As for whether to use a supporting line during the calculation process, the results vary, but expert instructors have explained that there is a method by which meeting the calculation criteria is sufficient to consider the strength requirements satisfied.