Calculation problems for external pressure cylinders
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Hello everyone: What is the difference between calculating the outer diameter/thickness for pressure vessels with values ≥20 and <20? Fundamental difference. Thank you all
What is the difference between an outer diameter/thickness of ≥20 and <20? Answer: The former is a long cylinder, which corresponds to stiffness instability, while the latter are all short cylinders; in their case, not only stiffness but also strength instability needs to be taken into account. The formulas used are also different in the two cases: the BRESSE formula is used in the former, while the MISES formula is used in the latter. At the critical length, the calculation results for the two formulas are identical; the critical condition is used as a criterion for classification. GB150 adopts this method of classification, which meets the requirements of engineering, and that is why this approach is used.