Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact
During the running of a high-speed train, the wheel may bounce on the rail due to the track irregularity. The wheel bounce could generate a vertical impact, leading to the initiation and expansion of delamination between layers of the track structure. In this paper, the evolution of the interfacial...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-01-01
|
| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/4022875 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850223193812369408 |
|---|---|
| author | Yu Liu Qianqi Xu Xiaodan Sun Guotao Yang Guotang Zhao |
| author_facet | Yu Liu Qianqi Xu Xiaodan Sun Guotao Yang Guotang Zhao |
| author_sort | Yu Liu |
| collection | DOAJ |
| description | During the running of a high-speed train, the wheel may bounce on the rail due to the track irregularity. The wheel bounce could generate a vertical impact, leading to the initiation and expansion of delamination between layers of the track structure. In this paper, the evolution of the interfacial damage and delamination subjected to the vertical impact is simulated using finite element analysis (FEA). In the FEA, a bilinear cohesive zone model (CZM) is adopted to simulate the interface between the track slab and the CA mortar layer. For different levels of impact energy, the contact force, vertical deformation, absorbed energy, area of interfacial damage, and area of delamination are calculated and compared. The effects of the tangential and normal stiffness of the interface on the distribution of interfacial damage and delamination are investigated. The results show that the contact force, vertical deformation, absorbed energy, area of interfacial damage, and area of delamination increase with the increase of the impact energy. The area of interfacial damage in the compression stage is closely related to the tangential stiffness, whereas the area of delamination depends on the normal stiffness. The normal stiffness that gives the largest area of delamination is recommended to be taken as the lower bound of the normal stiffness for both controlling the delamination and preventing an exceedance of the track irregularity limit. |
| format | Article |
| id | doaj-art-6a9e06b48db045b1bfcf1b9cae78bd00 |
| institution | OA Journals |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-6a9e06b48db045b1bfcf1b9cae78bd002025-08-20T02:06:04ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/40228754022875Simulation of Delamination Evolution of Slab Ballastless Track under Vertical ImpactYu Liu0Qianqi Xu1Xiaodan Sun2Guotao Yang3Guotang Zhao4School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaDepartment of Science, Technology and Information Technology, China Railway, Beijing 100844, ChinaDepartment of Science, Technology and Information Technology, China Railway, Beijing 100844, ChinaDuring the running of a high-speed train, the wheel may bounce on the rail due to the track irregularity. The wheel bounce could generate a vertical impact, leading to the initiation and expansion of delamination between layers of the track structure. In this paper, the evolution of the interfacial damage and delamination subjected to the vertical impact is simulated using finite element analysis (FEA). In the FEA, a bilinear cohesive zone model (CZM) is adopted to simulate the interface between the track slab and the CA mortar layer. For different levels of impact energy, the contact force, vertical deformation, absorbed energy, area of interfacial damage, and area of delamination are calculated and compared. The effects of the tangential and normal stiffness of the interface on the distribution of interfacial damage and delamination are investigated. The results show that the contact force, vertical deformation, absorbed energy, area of interfacial damage, and area of delamination increase with the increase of the impact energy. The area of interfacial damage in the compression stage is closely related to the tangential stiffness, whereas the area of delamination depends on the normal stiffness. The normal stiffness that gives the largest area of delamination is recommended to be taken as the lower bound of the normal stiffness for both controlling the delamination and preventing an exceedance of the track irregularity limit.http://dx.doi.org/10.1155/2021/4022875 |
| spellingShingle | Yu Liu Qianqi Xu Xiaodan Sun Guotao Yang Guotang Zhao Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact Shock and Vibration |
| title | Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact |
| title_full | Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact |
| title_fullStr | Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact |
| title_full_unstemmed | Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact |
| title_short | Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact |
| title_sort | simulation of delamination evolution of slab ballastless track under vertical impact |
| url | http://dx.doi.org/10.1155/2021/4022875 |
| work_keys_str_mv | AT yuliu simulationofdelaminationevolutionofslabballastlesstrackunderverticalimpact AT qianqixu simulationofdelaminationevolutionofslabballastlesstrackunderverticalimpact AT xiaodansun simulationofdelaminationevolutionofslabballastlesstrackunderverticalimpact AT guotaoyang simulationofdelaminationevolutionofslabballastlesstrackunderverticalimpact AT guotangzhao simulationofdelaminationevolutionofslabballastlesstrackunderverticalimpact |