Questions about Article 3.8 of the new regulations
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Why are the values for the safety factor corresponding to tensile strength in Tables 3-1 and 3-2 of Clause 3.8 of the new code specifications the tensile strength at room temperature? In my opinion, it should be the tensile strength at the design temperature. In GB150-98, the tensile strength specified in the same provisions refers to the tensile strength at room temperature; whereas in Table 3-4 of Article 40 of the old standard, which provides safety factor tables for aluminum, copper, titanium, nickel, and their alloys, the tensile strength at the design temperature is used. How can the above situations be explained? Please discuss.
It can be understood in this way: at high temperatures, the allowable stress is dominated by the yield strength, and that’s why. You can find this by referring to the high-temperature performance table in GB713 and Appendix F of GB150.
What was said on the 2nd floor makes sense; it can be understood that way