Qiang Yi , Xiaolong Liu , Shuguo Wang , Haiyang Chang , Zhuopeng Jiang , Wengjing Wang
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引用次数: 0
Abstract
Turnouts are crucial equipment for ensuring the safety of high-speed railways. The wheel-rail impact force is more obvious and the structural stress distribution is more complex in turnout area comparing with main lines. Fatigue failures of stock rail in high-speed railway turnout occurred after long-term service. A failure analysis by experimental and simulation methods was conducted to reveal the failure mechanism of the stock rail in the switch panel of railway turnout. First, the fracture surface of the failed stock rail was observed, indicating that the crack initiated from the rail bottom. Combing with the finite element modeling of the switch structure of the turnout, it was found that the stress of rail bottom at the fastening position of the slide chair is high, causing the crack initiation. Additionally, the effects of crack size and load on crack propagation of the stock rail was investigated by bench tests and simulation. It was noted that the crack propagation rate increased significantly with greater crack size and higher load. Moreover, the damage tolerance of the crack at the stock rail bottom was defined as 7 mm which is before the rapid propagation of cracks.
期刊介绍：
Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies.
Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials.
Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged.
Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.
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