RESEARCH ON ACCELERATED LOAD SPECTRUM FOR FATIGUE TEST OF PHEV SUBFRAME WELDS
Aiming at the problem of the weld fatigue test of the new energy vehicle subframe, a program load spectrum compilation method based on the failure dominant load was proposed. Firstly, the finite element model of the rear subframe was established, and the stress distribution under unit load was coupl...
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| Format: | Article |
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Editorial Office of Journal of Mechanical Strength
2025-08-01
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| Series: | Jixie qiangdu |
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| Online Access: | http://www.jxqd.net.cn/thesisDetails#10.16579/j.issn.1001.9669.2025.08.001 |
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| author | ZHAO Lihui WEI Xuguo LIANG Shan WENG Shuo FENG Jinzhi ZHANG Dongdong |
| author_facet | ZHAO Lihui WEI Xuguo LIANG Shan WENG Shuo FENG Jinzhi ZHANG Dongdong |
| author_sort | ZHAO Lihui |
| collection | DOAJ |
| description | Aiming at the problem of the weld fatigue test of the new energy vehicle subframe, a program load spectrum compilation method based on the failure dominant load was proposed. Firstly, the finite element model of the rear subframe was established, and the stress distribution under unit load was coupled with the load of each connection point. The structural stress method was used to evaluate the fatigue life of the subframe welds, and six dangerous points that were easy to fail were selected. Secondly, by comparing the load damage of each connection point, the failure dominant connection point corresponding to the weld dangerous unit was determined. Then, the failure dominant load was determined by the principal stress analysis, time domain correlation and uniaxial damage contribution at the weld, so as to reduce the dimension of the multi-axial load and reduce the difficulty of the bench test loading. Finally, a pseudo-damage matrix was output based on the failure dominant load, the characteristic working conditions and their proportions were selected to obtain the load spectrum of the fatigue accelerated test program, and the minimum number of cycles was determined according to the principle of the damage equivalence. The numerical simulation results show that the program load spectrum can reproduce the damage of dangerous points and has a high acceleration coefficient, which verifies the effectiveness of the accelerated test spectrum. |
| format | Article |
| id | doaj-art-e8ac5ab2ad514a5aababde4ff1ea5b6d |
| institution | Kabale University |
| issn | 1001-9669 |
| language | zho |
| publishDate | 2025-08-01 |
| publisher | Editorial Office of Journal of Mechanical Strength |
| record_format | Article |
| series | Jixie qiangdu |
| spelling | doaj-art-e8ac5ab2ad514a5aababde4ff1ea5b6d2025-08-23T19:00:16ZzhoEditorial Office of Journal of Mechanical StrengthJixie qiangdu1001-96692025-08-0147110122984974RESEARCH ON ACCELERATED LOAD SPECTRUM FOR FATIGUE TEST OF PHEV SUBFRAME WELDSZHAO LihuiWEI XuguoLIANG ShanWENG ShuoFENG JinzhiZHANG DongdongAiming at the problem of the weld fatigue test of the new energy vehicle subframe, a program load spectrum compilation method based on the failure dominant load was proposed. Firstly, the finite element model of the rear subframe was established, and the stress distribution under unit load was coupled with the load of each connection point. The structural stress method was used to evaluate the fatigue life of the subframe welds, and six dangerous points that were easy to fail were selected. Secondly, by comparing the load damage of each connection point, the failure dominant connection point corresponding to the weld dangerous unit was determined. Then, the failure dominant load was determined by the principal stress analysis, time domain correlation and uniaxial damage contribution at the weld, so as to reduce the dimension of the multi-axial load and reduce the difficulty of the bench test loading. Finally, a pseudo-damage matrix was output based on the failure dominant load, the characteristic working conditions and their proportions were selected to obtain the load spectrum of the fatigue accelerated test program, and the minimum number of cycles was determined according to the principle of the damage equivalence. The numerical simulation results show that the program load spectrum can reproduce the damage of dangerous points and has a high acceleration coefficient, which verifies the effectiveness of the accelerated test spectrum.http://www.jxqd.net.cn/thesisDetails#10.16579/j.issn.1001.9669.2025.08.001Rear subframeWeld fatiguePrincipal stress analysisFailure dominant loadCharacteristic working conditionProgram load spectrum |
| spellingShingle | ZHAO Lihui WEI Xuguo LIANG Shan WENG Shuo FENG Jinzhi ZHANG Dongdong RESEARCH ON ACCELERATED LOAD SPECTRUM FOR FATIGUE TEST OF PHEV SUBFRAME WELDS Jixie qiangdu Rear subframe Weld fatigue Principal stress analysis Failure dominant load Characteristic working condition Program load spectrum |
| title | RESEARCH ON ACCELERATED LOAD SPECTRUM FOR FATIGUE TEST OF PHEV SUBFRAME WELDS |
| title_full | RESEARCH ON ACCELERATED LOAD SPECTRUM FOR FATIGUE TEST OF PHEV SUBFRAME WELDS |
| title_fullStr | RESEARCH ON ACCELERATED LOAD SPECTRUM FOR FATIGUE TEST OF PHEV SUBFRAME WELDS |
| title_full_unstemmed | RESEARCH ON ACCELERATED LOAD SPECTRUM FOR FATIGUE TEST OF PHEV SUBFRAME WELDS |
| title_short | RESEARCH ON ACCELERATED LOAD SPECTRUM FOR FATIGUE TEST OF PHEV SUBFRAME WELDS |
| title_sort | research on accelerated load spectrum for fatigue test of phev subframe welds |
| topic | Rear subframe Weld fatigue Principal stress analysis Failure dominant load Characteristic working condition Program load spectrum |
| url | http://www.jxqd.net.cn/thesisDetails#10.16579/j.issn.1001.9669.2025.08.001 |
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