Variation features of MMM signals of X80 steel in tensile fatigue process under geomagnetic excitation
Fatigue failure and stress damage are the main damage forms of marine risers.To study the variation rule of surface magnetic field signals of X80 steel during tensile fatigue process under geomagnetic excitation, the fatigue tensile test of X80 steel specimens under typical working conditions was ca...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Oil & Gas Storage and Transportation
2023-07-01
|
| Series: | You-qi chuyun |
| Subjects: | |
| Online Access: | http://kykxxb.cumtb.edu.cn/article/10.6047/j.issn.1000-8241.2023.07.006 |
| _version_ | 1797208356385980416 |
|---|---|
| author | MENG Xiangbo SHI Yongjin |
| author_facet | MENG Xiangbo SHI Yongjin |
| author_sort | MENG Xiangbo |
| collection | DOAJ |
| description | Fatigue failure and stress damage are the main damage forms of marine risers.To study the variation rule of surface magnetic field signals of X80 steel during tensile fatigue process under geomagnetic excitation, the fatigue tensile test of X80 steel specimens under typical working conditions was carried out with an MTS810 250 fatigue tensile testing machine. During the experiment, the variation of magnetic field on the surface of the tensile specimen was monitored by a magnetic memory sensor, the fatigue failure of the specimen was observed by a handheld microscope, and the morphology of the fracture was analyzed with the help of scanning electron microscope(SEM).The results show that the magnetic memory is sensitive to the tensile fatigue damage. Thus, the characteristic parameters of magnetic memory detection for tensile fatigue damage of X80 steel were proposed, which took the extreme value of magnetic memory signal with background removed <i>H</i><sub>E</sub>(<i>X</i>) and the line slope of the extreme value of tangential gradient signal <i>S</i><sub>K</sub>(<i>X</i>) as the eigenvalues. As a result,zero crossing phenomena occur to <i>H</i><sub>E</sub>(<i>X</i>) and <i>S</i><sub>K</sub>(<i>X</i>) in the stage of crack initiation. The acceleration of <i>H</i><sub>E</sub>(<i>X</i>) and <i>S</i><sub>K</sub>(<i>X</i>) speeds up with the increase of the fatigue cycle, which is consistent with the crack growth law during the fatigue process. Generally, <i>H</i><sub>E</sub>(<i>X</i>) and <i>S</i><sub>K</sub>(<i>X</i>)can reflect the fatigue failure process of the specimen, and they can be used to monitor the fatigue damage of marine risers. This research results could provide a reference for the field application of the magnetic memory detection method in the fatigue damage detection of marine risers. |
| first_indexed | 2024-04-24T09:37:30Z |
| format | Article |
| id | doaj.art-616b1ec2cc87443d819619bf671dfe39 |
| institution | Directory Open Access Journal |
| issn | 1000-8241 |
| language | zho |
| last_indexed | 2024-04-24T09:37:30Z |
| publishDate | 2023-07-01 |
| publisher | Editorial Office of Oil & Gas Storage and Transportation |
| record_format | Article |
| series | You-qi chuyun |
| spelling | doaj.art-616b1ec2cc87443d819619bf671dfe392024-04-15T07:52:06ZzhoEditorial Office of Oil & Gas Storage and TransportationYou-qi chuyun1000-82412023-07-0141777478410.6047/j.issn.1000-8241.2023.07.00620230706Variation features of MMM signals of X80 steel in tensile fatigue process under geomagnetic excitationMENG Xiangbo0SHI Yongjin1Drilling Engineering Technology Company, Sinopec Shengli Petroleum Engineering Co.Ltd.Drilling Technology Research Institute, Sinopec Shengli Petroleum Engineering Co.Ltd.Fatigue failure and stress damage are the main damage forms of marine risers.To study the variation rule of surface magnetic field signals of X80 steel during tensile fatigue process under geomagnetic excitation, the fatigue tensile test of X80 steel specimens under typical working conditions was carried out with an MTS810 250 fatigue tensile testing machine. During the experiment, the variation of magnetic field on the surface of the tensile specimen was monitored by a magnetic memory sensor, the fatigue failure of the specimen was observed by a handheld microscope, and the morphology of the fracture was analyzed with the help of scanning electron microscope(SEM).The results show that the magnetic memory is sensitive to the tensile fatigue damage. Thus, the characteristic parameters of magnetic memory detection for tensile fatigue damage of X80 steel were proposed, which took the extreme value of magnetic memory signal with background removed <i>H</i><sub>E</sub>(<i>X</i>) and the line slope of the extreme value of tangential gradient signal <i>S</i><sub>K</sub>(<i>X</i>) as the eigenvalues. As a result,zero crossing phenomena occur to <i>H</i><sub>E</sub>(<i>X</i>) and <i>S</i><sub>K</sub>(<i>X</i>) in the stage of crack initiation. The acceleration of <i>H</i><sub>E</sub>(<i>X</i>) and <i>S</i><sub>K</sub>(<i>X</i>) speeds up with the increase of the fatigue cycle, which is consistent with the crack growth law during the fatigue process. Generally, <i>H</i><sub>E</sub>(<i>X</i>) and <i>S</i><sub>K</sub>(<i>X</i>)can reflect the fatigue failure process of the specimen, and they can be used to monitor the fatigue damage of marine risers. This research results could provide a reference for the field application of the magnetic memory detection method in the fatigue damage detection of marine risers.http://kykxxb.cumtb.edu.cn/article/10.6047/j.issn.1000-8241.2023.07.006marine risersx80 steeltensile fatiguemetal magnetic memory(mmm)characteristic parameters |
| spellingShingle | MENG Xiangbo SHI Yongjin Variation features of MMM signals of X80 steel in tensile fatigue process under geomagnetic excitation You-qi chuyun marine risers x80 steel tensile fatigue metal magnetic memory(mmm) characteristic parameters |
| title | Variation features of MMM signals of X80 steel in tensile fatigue process under geomagnetic excitation |
| title_full | Variation features of MMM signals of X80 steel in tensile fatigue process under geomagnetic excitation |
| title_fullStr | Variation features of MMM signals of X80 steel in tensile fatigue process under geomagnetic excitation |
| title_full_unstemmed | Variation features of MMM signals of X80 steel in tensile fatigue process under geomagnetic excitation |
| title_short | Variation features of MMM signals of X80 steel in tensile fatigue process under geomagnetic excitation |
| title_sort | variation features of mmm signals of x80 steel in tensile fatigue process under geomagnetic excitation |
| topic | marine risers x80 steel tensile fatigue metal magnetic memory(mmm) characteristic parameters |
| url | http://kykxxb.cumtb.edu.cn/article/10.6047/j.issn.1000-8241.2023.07.006 |
| work_keys_str_mv | AT mengxiangbo variationfeaturesofmmmsignalsofx80steelintensilefatigueprocessundergeomagneticexcitation AT shiyongjin variationfeaturesofmmmsignalsofx80steelintensilefatigueprocessundergeomagneticexcitation |