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Coefficient of Thermal expansion | Instantaneous vs mean

Coefficient of Thermal expansion | Instantaneous vs mean

Coefficient of Thermal expansion | Instantaneous vs mean

(OP)
Hi,

Table TE of ASME Section II part D lists the thermal expansion coefficients for materials. COlumn A of table TE represents instantaneous coefiicient of thermal expansion whereas column B represents mean coefficient of thermal expansion.

Which one is to be used in elastic analysis for evaluation of thermal stresses 'Q'?

Thanks

Shiraz
Sr. Engineer
Haldor Topsoe

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