Publications
| Title | | Authors |
|---|---|
| Effect of mean stress on the fatigue behaviour of gas transmission pipes « back |
F Knoop, G Mannucci, U Marewski, R Owen, M Steiner, G Wolvert and M Zarea |
| 15th Joint Technical Meeting, Orlando, Florida, May 2005 | |
| The fatigue strength of large diameter pipelines subjected to internal pressure fluctuations can be assessed, for example, on basis of the German standard DIN 2413[1]. The assessment according to this standard is based on stress range vs. number of cycles obtained by results of full scale fatigue tests on pipes performed at a constant stress ratio, with R about zero. Therefore, the influence of mean stress is not taken into account explicitly. More specifically, the DIN 2413 SN-curves can be less conservative when a stress range is applied in connection with a high mean stress level, which is typical for realistic operating conditions. Over the past years, extensive experimental research has been conducted by EPRG (European Pipeline Research Group) to evaluate if the effect of mean stress should be included in the fatigue criterion, by taking into account the actual value of stress ratio R. This paper summarises the main findings from these studies with respect to relevant criteria available in the literature and compared with published fatigue results and original data used as the basis for DIN 2413. | |
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