The equal-area strengthening method does not take into account the peak stress issue at the edges of openings; therefore, this method is not suitable for openings in fatigue-resistant containers...
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“The equal area reinforcement method does not take into account the peak stress at the edges of openings; therefore, this method is not suitable for reinforcing openings in fatigue-resistant containers.” This sentence comes from the explanation for 150, and it is often used in multiple-choice questions. The correct answer is definitely yes. However, there is another version available online, in which “peak stress” is replaced with “bending stress,” resulting in the statement: “The equal area reinforcement method does not take into account the bending stress at the edges of openings; therefore, this method is not suitable for reinforcing openings in fatigue-resistant containers.” ”Is it still possible to get such multiple-choice questions right? I’d like to ask everyone for advice, thank you
Definition in pressure vessel standards P144~145: Bending stress is a secondary stress. The stability of the secondary stress at the edges of openings in the equal-area reinforcement method is addressed indirectly by restricting the shape and size of the openings (the opening ratio), thereby allowing for some control over the local stress at those edges. Long-term usage experience has shown that, within the allowable range, the stability of the opening edges can be ensured using this method. So I think secondary stress has been taken into account. If there are any errors, please feel free to point them out