Problem:
Why does the allowable stress remain unchanged between ambient and design temperatures, even though the yield strength and tensile strength values vary?
Answer:
The software is functioning correctly, and there are no issues with the allowable stress calculations.
According to CODAP guidelines, when calculating allowable stress for carbon steel, the tensile strength at ambient temperature must be used—even under design conditions.
Therefore, there is no change in the allowable stress between ambient and design conditions because the governing criterion—Rm/2.4—remains constant in both cases.
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