A question regarding the selection of allowable stress values in finite element analysis.
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What I would like to ask is: in Table 3-4 of the current comprehensive regulation TSG21-2016, which standard, GB150 or JB4732, should be used as the reference for the yield strength at the design temperature? In the finite element analysis report, should the allowable stress be taken as tensile strength/2.4 and high-temperature yield strength/1.5 as specified in Appendix G of 4732, or should it be the allowable stress values listed in Table 6 of 4732? Should we use the high-temperature yield data from GB150 instead? If, instead of using the high-temperature data from JB4732 to calculate the allowable stress, Table 6 is used directly, then will this value meet the requirements of TSG21-2016?
The design methods for 150 and 4732 are different, as are their safety factors; the value to be used should be taken from the standard corresponding to the method being employed. If you look at what design stress intensity means and how it is calculated, you will know how to determine the appropriate value and whether it meets the regulatory requirements
Let’s go with 4732. Section 6 contains the allowable stress values for materials, while Appendix G provides the safety factors for the high-temperature properties of materials, as well as the analysis and design methods outlined in Table 3-4; the results obtained from these methods differ from those in Section 6. So, should we use the data from Section 6, or the calculation data based on larger capacity specifications?