Abstract
Additive manufacturing technologies, well known as three-dimensional printing (3DP) technologies, have been applied in many industrial fields, including aerospace, automobiles, shipbuilding, civil engineering and nuclear power. However, despite the high material utilization and the ability to rapidly construct complex shaped structures of 3D printing technologies, the application of additive manufacturing technologies in railway track infrastructure is still at the exploratory stage. This paper reviews the state-of-the-art research of additive manufacturing technologies related the railway track infrastructure and discusses the challenges and prospects of 3D printing technology in this area. The insights will not only help the development of 3D printing technologies into railway engineering but also enable smarter railway track component design and improve track performance and inspection strategies.
Highlights
The railway industry is a traditional part of civil engineering
This paper focuses on additive manufacturing technology (3D printing) application in
This paper focuses on additive manufacturing technology railway track infrastructure components
Summary
The railway industry is a traditional part of civil engineering. Since the first railway line was built in 1825, the railway system has been one of the most important transportation methods in every country around the world [1]. In slab track railway systems, the concrete track slab serves as a substitution for the sleepers and the ballasted layer to support the rails [4,5]. The stress inside railway infrastructure is greatest near the wheel–rail interface and is redistributed to a lower value on the rail-to-sleeper (including embedded sleeper in slab track) contact surface with a larger contact area. The dynamic loads are redistributed at the sleeper to ballasted layer, ballasted layer to subgrade, embedded sleeper concreteslab slabtoand concrete slab to subgrade. The of mechanical of rail (steel), sleeper (conFor the mechanical strengths rail (steel),strengths sleeper (concrete, timber, composite crete, timber, composite steel),rock ballasted layer (crushed rock particles) and subgrade and steel), ballasted layer and (crushed particles) and subgrade (soil) are from high to low,.
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