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Proceedings Papers

Environment Assisted Fatigue – Rules, Assumptions and Challenges for Fatigue Management of Primary Piping

Jussi Solin, Tommi Seppänen, Petri Lemettinen, Rami Vanninen, Erkki Pulkkinen
Proc. ASME. PVP2022, Volume 1: Codes and Standards, V001T01A014, July 17–22, 2022
Paper No: PVP2022-84627
https://doi.org/10.1115/PVP2022-84627
... of the cycles only. The partial fatigue usages Ui calculated using different methods can then be summed up for fatigue usage in environment Uen according to equation 13: (13) V001T01A014-4 Copyright © 2022 by ASME 3. THRESHOLD FOR ENVIRONMENTAL EFFECT 3.1 Threshold of strain amplitude It is a common assumption...
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Topics: Fatigue, Pipes
Proceedings Papers

Environment Assisted Fatigue – Experimental Challenges and Solutions

Jussi Solin, Tommi Seppänen, Rami Vanninen, Erkki Pulkkinen, Petri Lemettinen
Proc. ASME. PVP2022, Volume 1: Codes and Standards, V001T01A015, July 17–22, 2022
Paper No: PVP2022-84719
https://doi.org/10.1115/PVP2022-84719
... for environmental effects is a generally acknowledged necessity. A dominant solution for Environment Assisted Fatigue (EAF) is the penalty factor Fen, which is used to adjust the fatigue usage obtained through the codified fatigue analysis and design curve. [4,5] As the Fen factors are obtained through comparison...
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Topics: Fatigue
Proceedings Papers

Extension of Weighted Stress Intensity Factor Rate (WKR) Method to Characterisation of Varying Temperature and Loading Rate in Plant Realistic Waveform Fatigue Crack Growth Calculations

Chris Currie, Jonathan Mann, Peter Gill, Daniel Leary, Keith Wright
Proc. ASME. PVP2019, Volume 1: Codes and Standards, V001T01A021, July 14–19, 2019
Paper No: PVP2019-93855
https://doi.org/10.1115/PVP2019-93855
... Abstract The reference Fatigue Crack Growth (FCG) rate behaviour for austenitic stainless steel in a deaerated Pressurised Water Reactor (PWR) environment is provided in ASME Section XI Code Case N-809. This FCG law is dependent on load ratio and environmental factors in terms of a defined...
View Paper titled, Extension of Weighted Stress Intensity Factor Rate (WKR) Method to Characterisation of Varying Temperature and Loading Rate in Plant Realistic Waveform Fatigue Crack Growth Calculations
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Topics: Fatigue cracks, Pressurized water reactors, Stainless steel, Stress, Temperature