I have a vessel (complex shape). Temperature at inner and outer layers are given and I got thermal stresses. Now, is this whole stress secondary? When can I say that there is some primary stress included in that?
Primary loads are often force driven and non-cyclic.
Secondary loads, in contrast, are often displacement driven and cyclic.
Based on the your description of load, it looks like to be secondary loading.
I agree with Mohammad, in short I would consider as primary the stresses remaining in the material after machining/assembling. Stresses relative to the normal working conditions are definitely secondary.
As per my understanding......the stresses are completely secondary........but as per design codes a portion of secondary stress may work as primary stress you have to extract that portion and add it into primary stress. This resultant primary stress must be compared against allowable.....otherwise your creep damage prediction will not be conservative...
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