Another rule for stress evaluation in ASME B31.3 Appendix P
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The evaluation rules adopted in Appendix P can also be applied to account for the effects of nonlinear constraints. Then the question is, why not use the evaluation rules in Appendix P to replace those for evaluating secondary stress?
The evaluation rules in Appendix P apply to cases with nonlinear constraints, but they cannot always completely replace the evaluation rules for quadratic stress. This is because the evaluation of secondary stresses typically takes into account the stresses caused by temperature differences or other uneven loads, which can vary under different operating conditions. Appendix P focuses more on stress evaluation under nonlinear and complex constraints, and may not cover all factors considered in quadratic stress evaluation. Therefore, in some cases, traditional secondary stress evaluation rules may be more applicable. .
One can take a look at the derivation process in Peng’s paper. The conclusions are as follows: