Effect of chronological order of cyclic loads with different amplitudes on fatigue crack growth
When cracked bodies are subjected to cyclic loading, fatigue crack growth evaluation is often required from the viewpoint of the assurance of fitness-for-service. For cyclic loading with constant amplitude, crack growth can be calculated by integrating a fatigue crack growth rate law provided by the...
| Main Authors: | , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2017-05-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/849/83_16-00116/_pdf/-char/en |
| _version_ | 1828126176763183104 |
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| author | Naoki MIURA Masaki NAGAI |
| author_facet | Naoki MIURA Masaki NAGAI |
| author_sort | Naoki MIURA |
| collection | DOAJ |
| description | When cracked bodies are subjected to cyclic loading, fatigue crack growth evaluation is often required from the viewpoint of the assurance of fitness-for-service. For cyclic loading with constant amplitude, crack growth can be calculated by integrating a fatigue crack growth rate law provided by the Paris law in regard to stress intensity factor range. However, the cause of cyclic loading assumed in actual plants is not unique. For an example of LWR plants, a number of datasets of cyclic loading with different amplitudes is necessary for specific transient events. And the chronological order of individual transients cannot be determined. In this paper, a general treatment of the multiple transients was proposed in case that the chronological order of the transients was indefinite. It was found that cyclic loading sequence such that the loadings were lined up in the order corresponding to larger amplitude gave the most conservative crack growth prediction among the possible sequences from the set of the specific transient events. Nevertheless the effect of the sequence was quite limited and the differences in fatigue crack growth could be comparable to the order of possible rounding errors. |
| first_indexed | 2024-04-11T15:30:40Z |
| format | Article |
| id | doaj.art-a90a25fb8fbc409aa625344f00c36db3 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T15:30:40Z |
| publishDate | 2017-05-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-a90a25fb8fbc409aa625344f00c36db32022-12-22T04:16:09ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-05-018384916-0011616-0011610.1299/transjsme.16-00116transjsmeEffect of chronological order of cyclic loads with different amplitudes on fatigue crack growthNaoki MIURA0Masaki NAGAI1Central Research Institute of Electric Power IndustryCentral Research Institute of Electric Power IndustryWhen cracked bodies are subjected to cyclic loading, fatigue crack growth evaluation is often required from the viewpoint of the assurance of fitness-for-service. For cyclic loading with constant amplitude, crack growth can be calculated by integrating a fatigue crack growth rate law provided by the Paris law in regard to stress intensity factor range. However, the cause of cyclic loading assumed in actual plants is not unique. For an example of LWR plants, a number of datasets of cyclic loading with different amplitudes is necessary for specific transient events. And the chronological order of individual transients cannot be determined. In this paper, a general treatment of the multiple transients was proposed in case that the chronological order of the transients was indefinite. It was found that cyclic loading sequence such that the loadings were lined up in the order corresponding to larger amplitude gave the most conservative crack growth prediction among the possible sequences from the set of the specific transient events. Nevertheless the effect of the sequence was quite limited and the differences in fatigue crack growth could be comparable to the order of possible rounding errors.https://www.jstage.jst.go.jp/article/transjsme/83/849/83_16-00116/_pdf/-char/enstress intensity factorfatiguecrack growthtransientfracture mechanics |
| spellingShingle | Naoki MIURA Masaki NAGAI Effect of chronological order of cyclic loads with different amplitudes on fatigue crack growth Nihon Kikai Gakkai ronbunshu stress intensity factor fatigue crack growth transient fracture mechanics |
| title | Effect of chronological order of cyclic loads with different amplitudes on fatigue crack growth |
| title_full | Effect of chronological order of cyclic loads with different amplitudes on fatigue crack growth |
| title_fullStr | Effect of chronological order of cyclic loads with different amplitudes on fatigue crack growth |
| title_full_unstemmed | Effect of chronological order of cyclic loads with different amplitudes on fatigue crack growth |
| title_short | Effect of chronological order of cyclic loads with different amplitudes on fatigue crack growth |
| title_sort | effect of chronological order of cyclic loads with different amplitudes on fatigue crack growth |
| topic | stress intensity factor fatigue crack growth transient fracture mechanics |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/849/83_16-00116/_pdf/-char/en |
| work_keys_str_mv | AT naokimiura effectofchronologicalorderofcyclicloadswithdifferentamplitudesonfatiguecrackgrowth AT masakinagai effectofchronologicalorderofcyclicloadswithdifferentamplitudesonfatiguecrackgrowth |