Structural integrity of stainless steel components exposed to neutron irradiation (Change in failure strength of cracked components due to cold working)
Load carrying capacity of austenitic stainless steel component is increased due to hardening caused by neutron irradiation if no crack is included in the component. On the other hand, if a crack is initiated in the reactor components, the hardening may decrease the load carrying capacity due to redu...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2014-09-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/80/817/80_2014smm0252/_pdf/-char/en |
| _version_ | 1817970741703868416 |
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| author | Masayuki KAMAYA Tomohiro HOJO Masahito MOCHIZUKI |
| author_facet | Masayuki KAMAYA Tomohiro HOJO Masahito MOCHIZUKI |
| author_sort | Masayuki KAMAYA |
| collection | DOAJ |
| description | Load carrying capacity of austenitic stainless steel component is increased due to hardening caused by neutron irradiation if no crack is included in the component. On the other hand, if a crack is initiated in the reactor components, the hardening may decrease the load carrying capacity due to reduction in fracture toughness. In this paper, in order to develop a failure assessment procedure of irradiated cracked components, characteristics of change in failure strength of stainless steels due to cold working were investigated. It was experimentally shown that the proof and tensile strengths were increased by the cold working, whereas the fracture toughness was decreased. The fracture strengths of a cylinder with a circumferential surface crack were analyzed using the obtained material properties. Although the cold working altered the failure mode from plastic collapse to the unsteady ductile crack growth, it did not reduce failure strengths even if 50% cold working was applied. The increase in failure strength was caused not only by increase in flow stress but also by reduction in J-integral value, which was brought by the change in stress-strain curve. It was shown that the failure strength of the hardened stainless steel components could be derived by the two-parameter method, in which the change in material properties could be reasonably considered. |
| first_indexed | 2024-04-13T20:37:52Z |
| format | Article |
| id | doaj.art-547954400b55459ba1f0b77dd1021e1b |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-13T20:37:52Z |
| publishDate | 2014-09-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-547954400b55459ba1f0b77dd1021e1b2022-12-22T02:30:59ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612014-09-0180817SMM0252SMM025210.1299/transjsme.2014smm0252transjsmeStructural integrity of stainless steel components exposed to neutron irradiation (Change in failure strength of cracked components due to cold working)Masayuki KAMAYA0Tomohiro HOJO1Masahito MOCHIZUKI2Institute of Nuclear Safety System, Inc.Nuclear Regulation AuthorityOsaka UniversityLoad carrying capacity of austenitic stainless steel component is increased due to hardening caused by neutron irradiation if no crack is included in the component. On the other hand, if a crack is initiated in the reactor components, the hardening may decrease the load carrying capacity due to reduction in fracture toughness. In this paper, in order to develop a failure assessment procedure of irradiated cracked components, characteristics of change in failure strength of stainless steels due to cold working were investigated. It was experimentally shown that the proof and tensile strengths were increased by the cold working, whereas the fracture toughness was decreased. The fracture strengths of a cylinder with a circumferential surface crack were analyzed using the obtained material properties. Although the cold working altered the failure mode from plastic collapse to the unsteady ductile crack growth, it did not reduce failure strengths even if 50% cold working was applied. The increase in failure strength was caused not only by increase in flow stress but also by reduction in J-integral value, which was brought by the change in stress-strain curve. It was shown that the failure strength of the hardened stainless steel components could be derived by the two-parameter method, in which the change in material properties could be reasonably considered.https://www.jstage.jst.go.jp/article/transjsme/80/817/80_2014smm0252/_pdf/-char/enfailure stregnthstainless steelneutron irradiationcold workingtwo-parameter methodfailure assessment curvej-integral valueelastic-plastic fracure mechanicslimit load |
| spellingShingle | Masayuki KAMAYA Tomohiro HOJO Masahito MOCHIZUKI Structural integrity of stainless steel components exposed to neutron irradiation (Change in failure strength of cracked components due to cold working) Nihon Kikai Gakkai ronbunshu failure stregnth stainless steel neutron irradiation cold working two-parameter method failure assessment curve j-integral value elastic-plastic fracure mechanics limit load |
| title | Structural integrity of stainless steel components exposed to neutron irradiation (Change in failure strength of cracked components due to cold working) |
| title_full | Structural integrity of stainless steel components exposed to neutron irradiation (Change in failure strength of cracked components due to cold working) |
| title_fullStr | Structural integrity of stainless steel components exposed to neutron irradiation (Change in failure strength of cracked components due to cold working) |
| title_full_unstemmed | Structural integrity of stainless steel components exposed to neutron irradiation (Change in failure strength of cracked components due to cold working) |
| title_short | Structural integrity of stainless steel components exposed to neutron irradiation (Change in failure strength of cracked components due to cold working) |
| title_sort | structural integrity of stainless steel components exposed to neutron irradiation change in failure strength of cracked components due to cold working |
| topic | failure stregnth stainless steel neutron irradiation cold working two-parameter method failure assessment curve j-integral value elastic-plastic fracure mechanics limit load |
| url | https://www.jstage.jst.go.jp/article/transjsme/80/817/80_2014smm0252/_pdf/-char/en |
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