- Temperature Field Of Two-way Coupling Characteristics Of The Interval Damping Layer Supporting Wheels Stress Analysis

The study is supported by the Research Fund for the Doctoral Program of Higher Education of China named"Thermal Erosion Mode of Viscoelastic Suspensions Used in Construction Machinery and Its Countermeasure". Taking the bogie wheels with spacing-damping layer mounted in crawler construction vehicles as the study object and considering fatigue breakdown and thermal failure of bogie wheels occurs easily when the wheels suffer vibration and impacts severely, stress field and temperature field models were established respectively, and the two models were coupled bilaterally and calculated by finite element method (FEM). The dynamic characteristic of bogie wheel under the coupling of the two fields was analyzed, and it is shown the rubber material fatigue breakdown occurs easily in the position of 1/4 damping layer axial symmetry end face, and the rubber material"thermal softening"occurs easily in the adhesive position between the spaced-damping and constrained layers. The bogie wheel structures were improved by cutting the constrained and damping layers, and the stress-temperature fields of the improved structures were verified.Taking certain type 310 kW crawler bulldozer as an application object, 1/4 finite element (FE) stress and temperature fields 3D axial symmetry model of bogie wheel with spacing-damping layer respectively were built up under 3 typical working conditions(cutting and bulldozing the earth, loosing the earth and passing through the barrier).The stress and thermal field models were calculated by FE bilateral coupling. Then the calculation results show the stress of bogie wheel is so large under extreme work condition that the bogie wheel is fatigue breakdown easily, and the stress in the position of 1/4 damping layer axial symmetry end face is so large that fatigue breakdown of rubber material occurs easily, as well as the deformation and temperature in the adhesive position between the spaced-damping and constrained layers is so large that"thermal softening"of rubber material occurs easily. The bogie wheel structure was improved by the two methods of cutting the constrained and damping layers, the comparison shows the method is better with cutting the constrained and damping layers along the space layer both ends, and the stress and temperature distribution of the improved structure are even and symmetry, as well as the total dissipation energy increases. The fact shows occurrence probability of fatigue breakdown and thermal failure decreases for the improved structure and the buffer performance is also advantaged. However, the stress of the improved bogie wheel is larger under extreme work condition yet, and the stiffness need be enhanced to protect the bogie wheel from fatigue breakdown. Premising the without change thickness of improved bogie wheel, the thickness of constrained layer increased. And then the calculation result show the stress decreases dramatically.The thoughts and methods adopted in this paper can provide references for the design and improvement of high performance bogie wheels.