RE: [PipingDesign] Re: Cryogenic pipework standards

From: <SARE>
Date: Thu Aug 23 2001 - 04:50:00 EDT

it is. the result should be treated as guide to help make an i nformed descision - repair, replace or accept the flawed on a piece of equipment. Knowing also a bit of fracture mechanics will help improve design resulting in a much reliable equpemtn or piping system.

-----Original Message-----
From: Christopher Wright [mailto:chrisw@skypoint.com] Sent: 22 August, 2001 7:10 PM
To: ?
Subject: Re: [PipingDesign] Re: Cryogenic pipework standards

>Chris discussion on material toughness at low temp can best be
>undestood using the toughness curve (resemble an S-cuve)for carbon
>and low alloy steel. At the lower shelf its the brittle zone
>(cleavage fracture) and at the upper shelf its tough (shear fracture).
Charpy V works real well to determine whether a material is tough at a given temperature. Fracture mechanics helps figure out what to do about it. I've seen some very useful work correlating Cv energy to critical stress intensity, but it's still not a very precise determination--like fatigue, everything depends on microstructure and load history and sub-surface micro-gremlins.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw@skypoint.com        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

http://www.skypoint.com/~chrisw

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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Thu Aug 23 04:50:00 2001