Creep fatigue behaviour and the application of damage prediction models for 2.25Cr 1Mo steel
| Autor: | Toppler, Karl |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
life assessment
401607 Metals and alloy materials stress modified ductility exhaustion power station boiler 401704 Mechanical engineering asset management remaining life 4016 Materials engineering 2.25Cr 1Mo low alloy steel Creep-fatigue 40 ENGINEERING life prediction strain energy density exhuastion |
| DOI: | 10.26190/unsworks/24860 |
| Popis: | Experimental creep fatigue data for normalised and tempered 2.25Cr 1Mo steel at 550 °C, with strain ranges of 0.8–1.2% and dwell times of 0–120 min, was generated to assess the accuracy of five different creep-fatigue life prediction models. The accuracy of the models was determined from the average total damage predicted by each of the models. The strain energy density model was found to be the most accurate, the R5, Fermi and stress modified ductility exhaustion models were the next most accurate, while the time fraction model was found to be the least accurate. Comparison with available data indicated that that the strain energy density exhaustion model may also give the best prediction of failure for other materials. The stress modified ductility exhaustion model was, however, found to give the most accurate prediction of failure at low start of dwell stresses, which are more representative of the stresses experienced in high temperature plant. While there were differences in the overall accuracy of the different models, it is considered that all models did, in fact, give acceptable accuracy. This is supported by the results from the creep-fatigue interaction diagram in which almost all the data fell between the generally accepted factor of two scatterband. The study is considered to validate the life prediction methods put forward by ASME, RCC-MR and EDF for this material and supports their use by designers and remnant life assessors of high temperature plant. It also validates the newer stress modified ductility exhaustion and strain energy density exhaustion life prediction models. The study also extends the data set available for 2.25Cr 1Mo steel. |
| Databáze: | OpenAIRE |
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