| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 104 === In the study, the finite element package of ABAQUS is utilized to numerically analyze the stress distributions of bonded insulated rail joints with different geometries and material properties. At first, a numerical model composed of rails, joint bars, epoxy, bolts, insulated sleeves for bolts, insulated sheet between rails, and sleepers, was generated by using the finite element software. Next, a vertical concentrated load was imposed on the bonded insulated rail joint to simulate the weight of a train passing on it. The effects of the suspended and supported placement of sleepers, the thickness and Poisson’s ratio of epoxy, and the length of joint bar on the stress distributions at the interfaces between steel rail and epoxy were evaluated numerically.
Numerical results show that the interfacial stresses at the boundaries between steel rail and epoxy can be effectively reduced when the supported placement of sleepers is employed as compared to the suspended placement of sleepers. The interfacial tensile stress at the bottom part of the bonded insulated rail joint under the supported placement of sleepers is increased but the other interfacial stresses are decreased as the thickness of epoxy is increased. When the length of joint bar becomes shorter, the interfacial tensile stress of the bonded insulated rail joint under the supported placement of sleepers is increased significantly but the other interfacial stresses are affected insignificantly. Also, the interfacial stresses of bonded insulated rail joints are higher and more concentrated when the material property of epoxy becomes incompressible.
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