The roundness requirements for vessels under external pressure and in vacuum are stricter than those for vessels under internal pressure, mainly to prevent instability
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The roundness requirements for vessels under external pressure and in vacuum are stricter than those for vessels under internal pressure, mainly to prevent instability, right? Conversely, then, the roundness of vessels under external pressure and in vacuum is the main factor leading to instability, right?
This is the final result. It is mainly the external pressure that causes the device to flatten; if its roundness is not high, additional bending stresses are generated at the defective areas, leading to an increase in compressive stress within the device and a decrease in the critical pressure, which can ultimately result in instability.
Its purpose is to prevent instability
Conversely, it cannot be considered the main factor; it can only be regarded as one factor, with insufficient equipment stiffness being the key cause of instability.
Reply to 2# Wen Bing: The main factor causing instability in pressure vessels subjected to external forces is insufficient stiffness; methods such as adding reinforcement rings should be considered to increase stiffness, rather than focusing on the precision of manufacturing. :)
Reply to 5# Bingyu Wuchen: Of course. I’m just answering why the requirement for external pressure roundness is higher than that for internal pressure roundness.
7th floor: She’s highly skilled and very enthusiastic