Regarding the stress increase coefficient
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I would like to ask if anyone has modified the SIF MULTIPLIER value in the SIF options under configuration/setup; and whether such a modification would affect the stress amplification factor in the results
I have also encountered the issue of setting the SIF MULTIPLIER value. Firstly, its full name is the cold-state stress increase correction factor, and it only affects the primary stress. There are three options available for you to choose from. For 1, 0.75, and 0.0001, ASME provides specifications for these coefficients, but it does not state under what circumstances each value should be used. Generally, this coefficient is specified in the stress analysis technical specifications; if no specification is given, I tend to use 0.75. Do anyone have better suggestions? ?
Tang Yongjin’s book \"Stress Analysis of Pressure Pipes\" includes calculations for SIF; there is also a paper available online – I can’t remember its address – which provides SIF values for some special types of pipes. In any case, this isn’t a difficult problem at all!
Regarding the SIF multiplier: 1. The SIF multiplier only affects Sustain and OCC values. 2. Options: typical values are a---0.00; b---0.75, c---1.00. A value of 0.00 is not recommended due to issues with bending performance at the fitting site; according to ASME 31.3 version 1980, values of 0.75 or 1.00 are recommended
The stress concentration factor can be found in relevant sources; I don’t remember exactly where
The stress concentration factor and the stress amplification factor upstairs are different concepts
Isn’t it true that in the new standards, the stress under continuous loading does not take the SIF into account? In other words, SIF is 1 everywhere. In the stress calculation under the combined effect of occasional loads and continuous loads, 0.75i seems to be used. I’m not quite sure about this setting in the software; the help file states that the default value is 1. I think a value of 0.75 should be used when SIF is considered, while 0.0001 should be used when it isn’t.