Standard: WRC BUL 195

A REVIEW OF BOUNDING TECHNIQUES IN SHAKEDOWN AND RATCHETING AT ELEVATED TEMPERATURES ; A REVIEW OF CREEP INSTABILITY IN HIGH-TEMPERATURE PIPING AND PRESSURE VESSELS; UPPER BOUNDS FOR ACCUMULATED STRA

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Scope:

The life span of stressed components operating at high temperature is limited by such factors as excessive deformation, rupture, fatigue and brittle fracture, but in this report only the role of deformation is discussed. In components which creep, the deformation is normally limited so that the average creep strain allowed is 1%, or about ten times the maximum elastic strain, while the maximum allowable strain is limited to 5%. Under constant loading, the determination of the creep strains is a fairly straightforward procedure, although for complex geometries the computing power required can be considerable. It is under conditions of cyclic loading, however, that the determination of the creep strains becomes more difficult, and indeed it is because of the cyclic loading that deformation rates can sometimes accelerate very dramatically. Because of the 1% strain limitation, ratcheting effects must be almost nonexistent, since a 1% strain accumulation in 5000 cycles corresponds to a ratchet strain per cycle of only 2x10-4%

Organization: Welding Research Council
Document Number: wrc bul 195
Publish Date: 1974-06-01
Page Count: 123
Change Type: NEW ADDITION
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active
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