Test Research And Numerical Simulation On Mechanical Properties Of Lateral-Displacements-Resisted Plate Rubber Bearings

With the increasing speed of Chinese bullet trains, the lateral swaying force oftrain also will be a large increase when the trains were running. So that the lateraldisplacement of laminated rubber bearings increases and exceeds the specifiedmaximum. Therefore, how to restrict the lateral displacement of the bearings is oneof the most important research topics which effect on the safety of bullet trains.It is reasonable to achieve a good resistant to lateral displacement by adjustingthe structure of the stiffening plate inside the laminated rubber bearings. This paperprovides a new kind of laminated rubber bearings in which the stiffening plate iswavy, based on the existing laminated rubber bearings resistant to lateraldisplacement. Coordinated with relevant testing regulations of the Ministry ofCommunications industry standards JT/T4-2004, the comparison tests were donebetween the laminated rubber bearings resistant to lateral displacement and the sameplanar dimensions of ordinary rubber bearings. Be seen by the comparative data ofthe experimental data, the stiffening plate designed wavy constrained transversedeformation of the rubber layer, thereby limiting the lateral displacement of thebearing, and the more waveform, the better restraints it achieves In addition, therubber material of the rubber bearings are used for uniaxial tension, uniaxialcompression, plane shear and hardness experiments to reveal the non-linearmechanical properties of rubber materials. The finite element model of the bearingswere built to compare the numerical results with experimental data, by this way, thecorrectness of numerical analysis was demonstrated. By numerical analysis, we canfind that expansion in the horizontal direction of the rubber is too large; it is becausethat the compressive elastic modulus of the laminated rubber bearing resistant tolateral displacement is larger than the ordinary bearings. The steel plate and therubber layer of the bearing are bonding together by high temperature vulcanization,the peel strength is10Mpa. This paper examines the shear stress of the various typesof rubber layers inside the bearings. Compared with the ordinary rubber bearings,the stress concentration is more serious in rubber layer of the laminated rubber bearings resistant to lateral displacement, but all in the safe range.Finally, the parametric modeling in ANSYS APDL language was used to buildthe model of A-type bearing. According to the idea of optimized design of thelaminated rubber bearings resistant to lateral displacement, in the premise that themaximum shear stress in the rubber layer does not exceed the peel strength of10MPa and to keep the longitudinal shear modulus unchanged, to improve thelateral shear modulus of bearings. Respectively investigated the effects of thechange of stiffening plate folded slope i, flat-panel length L, and the groove depth D,Finally, consider the whole of the three factors to determine the best range of eachfactors.