Re: Secondary creep laws

Barbara,
I advised you looking some Material selector, Reynhold Publishing, Co, NY.and Tool Engineer Handbook 2 nd, ed., MCGraw-Hill book, and ASME Handbook-Metal PRoperties, MC Graw-Hill Book, Co. also you will find good text books.

Rofinus@telkom.net

• Original Message ----- From: "James, Barbara" <bjames@mitsuibabcock.com> To: <PipingDesign@yahoogroups.com> Sent: Thursday, May 17, 2001 9:31 PM Subject: [PipingDesign] Secondary creep laws Hi from one of the lurkers.

> I am undertaking a creep life study for a steam line on a refinery.
> I have completed the pipe stress analysis using PSA5 and have the
> pipe moments and forces from the BS806 Hot Stress case (DW + Pressure
> + Thermal expansion).

> Obviously, I also have the stresses but these include the SIFs
> calculated
> by the code which calculate peak stresses rather than the re-distributed
> stresses.
> In order to calculate the re-distributed stresses, I need to know the
> material constants for the secondary creep law. e.g Norton Law :
> Epsilon = B * Sigma^n
>
> Epsilon = creep strain rate
> Sigma = stress
> B and n are material constants.
>
> Does anybody know where I can find the material constants B and n?
> The material is ASTM A335 P11.
> Can anyone recommend good text books for creep behaviour?
> Thanks
>
> Barbara James>
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[Non-text portions of this message have been removed] Received on Fri May 18 00:01:00 2001