Pressure vessel calculation
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In GB150.3, A3.4 states that film stress is positive for tensile stress and negative for compressive stress. How should this be understood? Should the film stress for internal pressure vessels be taken as negative?
Should the film stress for internal pressure vessels be taken as negative? Where was it said that tensile stress is considered positive while compressive stress is considered negative? It seems to be the standard practice in mechanics of materials
The value determines whether a pressure vessel is under compression or tension Mainly non-circular pressure vessels. For example, rectangular pressure vessels
In a rectangular container, the stress in the membrane should be tensile stress, right? Whether a cross-section is taken horizontally or vertically, there is tensile stress on the walls of the container
You’ve misunderstood; what was said on the second floor is correct. You must have only started learning for a short time; it’s hard to explain this issue to you. The film stress in internal pressure vessels is tensile stress.
A.3 mentioned by the original poster refers to the strength criteria for the design of containers with non-circular cross-sections. Such containers are subjected to membrane stress and bending stress, and the total stress is the algebraic sum of these two stresses; it is specified that membrane stress is positive in tension and negative in compression.