WRC 492:2004

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Piping System SIFs and Flexibility Analysis Criteria: Part 1 and Part 2

Published By	Publication Date	Number of Pages
WRC	2004	38

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Description

Part 1: Piping System SIFs and Flexibility Analysis Criteria: Effect of Loading and Stress-Strain Curve on Stress Instensification Factors

The basic objective of this investigation is to determine the effect of loading and the shape of the stress-strain curve on the stress intensification factors of Markl's fatigue evaluation method for metal piping. Markl's method is based on the fatigue testing of cantilever piping. Subsequent testing using a four-point loading showed that the S-N data were different from that predicted by the equation developed by Markl.

Previous analytical work on this topic [1] showed that these differences should occur from cantilever and fourpoint tests. The basic assumption in this analytical comparison is that strain-cycle correlations lead to the correct fatigue life. Given an alternating strain, both types of testing lead to the same predicting of fatigue life using strain-cycle correlations.

Part 2: Piping System SIFs and Flexibility Analysis Criteria: Investigation of Criteria Where Piping System Analysis is Not Required by ASME Piping Codes B31.1 and B31.3

Report 2 investigates the background of the criteria, the various criteria equations, the associated "warnings" and the accuracy of the criteria equations.

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