期刊
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
卷 58, 期 -, 页码 222-232出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijnonlinmec.2013.10.004
关键词
Interface damage; Cohesive zone model; CRTS-II slab track; Vehicle-track coupled dynamics; Temperature load
类别
资金
- National Basic Research Program of China (973 Program) [2013CB036202]
- National Hi-tech Research and Development Program of China (863 Program) [2011AA11A103-3-1-1]
- National Natural Science Foundation of China (NSFC) [51008254]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1178]
- China Scholarship Council
- Southwest Jiaotong University
- Fundamental Research Funds for the Central Universities
This paper presents a three-dimensional finite element model to investigate the interface damage occurred between prefabricated slab and CA (cement asphalt) mortar layer in the China Railway Track System (CRTS-II) slab track system. In the finite element model, a cohesive zone model with a non-linear constitutive law is introduced and utilized to model the damage, cracking and delamination at the interface. Combining with the temperature field database obtained from the three-dimensional transient heat transfer analysis, the interface damage evolution as a result of temperature change is analyzed. A three-dimensional coupled dynamic model of a vehicle and the slab track is then established to calculate the varying rail-supporting forces which are utilized as the inputs to the finite element model. The non-linearities of the wheel-rail contact geometry, the wheel-rail normal contact force and the wheel-rail tangential creep force are taken into account in the model. Setting the maximum interface damaged state calculated under temperature change as the initial condition, the interface damage evolution and its influence on the dynamic response of the slab track are investigated under the joint action of the temperature change and vehicle dynamic load. The analysis indicates that the proposed model is capable of predicting the initiation and propagation of cracks at the interface. The prefabricated slab presents lateral warping, resulting in severe interface damage on both the sides of the slab track along the longitudinal direction during temperature drop process, while the interface damage level does not change significantly under vehicle dynamic loads. The interface damage has great effects on the dynamic responses of the slab track. (C) 2013 Elsevier Ltd. All rights reserved.
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