Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process
The U-shaped metal bellows expansion joint compensates for the pipeline displacement by its own deformation. The compensation performance of the metal bellows in the initial stage of tension and compression deformation is unstable. In this paper, the symmetrical cyclic tension and compression (SCTC)...
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MDPI AG
2021-12-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/13/12/2451 |
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| author | Zengliang Hao Biao Yao Yuhang Chen Junting Luo |
| author_facet | Zengliang Hao Biao Yao Yuhang Chen Junting Luo |
| author_sort | Zengliang Hao |
| collection | DOAJ |
| description | The U-shaped metal bellows expansion joint compensates for the pipeline displacement by its own deformation. The compensation performance of the metal bellows in the initial stage of tension and compression deformation is unstable. In this paper, the symmetrical cyclic tension and compression (SCTC) process of metal bellows was simulated by ABAQUS software. Then, the SCTC process experiment of metal bellows was completed on the universal material testing machine. The distribution law of axial load with displacement and that of axial stiffness and yield load with cycles of metal bellows were obtained. Finally, the X-ray diffraction peak confirmed the deformation-induced martensite in the wave trough and proved that the plastic strain and hardness values of metal bellows increased with the displacement amplitude. The microstructure in the wave trough area was observed by a Zeiss microscope, and the stability characteristics mechanism of the metal bellows was revealed. The martensite in the wave trough increases the grain boundary area under SCTC loading. The forward movement of the slip band in the grain caused by large deformation reached an equilibrium state with the resistance at the grain boundary, which promotes the macroscopic mechanical properties of the metal bellows to be stable characteristics under SCTC loading. |
| first_indexed | 2024-03-10T03:00:12Z |
| format | Article |
| id | doaj.art-9bee36d9a2dc45a098872762208c98b7 |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T03:00:12Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-9bee36d9a2dc45a098872762208c98b72023-11-23T10:47:26ZengMDPI AGSymmetry2073-89942021-12-011312245110.3390/sym13122451Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression ProcessZengliang Hao0Biao Yao1Yuhang Chen2Junting Luo3School of Mechanical and Electrical Engineering, North China Institute of Aerospace Engineering, Langfang 065000, ChinaSchool of Mechanical and Electrical Engineering, North China Institute of Aerospace Engineering, Langfang 065000, ChinaSchool of Mechanical and Electrical Engineering, North China Institute of Aerospace Engineering, Langfang 065000, ChinaKey Laboratory of Advanced Forging & Stamping Technology and Science, Yanshan University, Ministry of Education of China, Qinhuangdao 066004, ChinaThe U-shaped metal bellows expansion joint compensates for the pipeline displacement by its own deformation. The compensation performance of the metal bellows in the initial stage of tension and compression deformation is unstable. In this paper, the symmetrical cyclic tension and compression (SCTC) process of metal bellows was simulated by ABAQUS software. Then, the SCTC process experiment of metal bellows was completed on the universal material testing machine. The distribution law of axial load with displacement and that of axial stiffness and yield load with cycles of metal bellows were obtained. Finally, the X-ray diffraction peak confirmed the deformation-induced martensite in the wave trough and proved that the plastic strain and hardness values of metal bellows increased with the displacement amplitude. The microstructure in the wave trough area was observed by a Zeiss microscope, and the stability characteristics mechanism of the metal bellows was revealed. The martensite in the wave trough increases the grain boundary area under SCTC loading. The forward movement of the slip band in the grain caused by large deformation reached an equilibrium state with the resistance at the grain boundary, which promotes the macroscopic mechanical properties of the metal bellows to be stable characteristics under SCTC loading.https://www.mdpi.com/2073-8994/13/12/2451U-shaped metal bellowsSCTC processstability characteristicsmechanism |
| spellingShingle | Zengliang Hao Biao Yao Yuhang Chen Junting Luo Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process Symmetry U-shaped metal bellows SCTC process stability characteristics mechanism |
| title | Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process |
| title_full | Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process |
| title_fullStr | Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process |
| title_full_unstemmed | Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process |
| title_short | Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process |
| title_sort | stability characteristics and mechanism of u shaped metal bellows under symmetrical cyclic tension and compression process |
| topic | U-shaped metal bellows SCTC process stability characteristics mechanism |
| url | https://www.mdpi.com/2073-8994/13/12/2451 |
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