Allowable stress for the thermal expansion

"Sahand" wrote in message news:4863aa9f@news.prod-bent.dmz...

I have a model with A-106 Gr B material to be analyzed acc. to B31.3 After running the static analysis and checking the results I get [None] as allowable stress for expansion stresses. I have attached the print screen of it. What can be the source of the problem?

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boosterpumpeabc2.dat