Cracking Analysis And Structure Improvement Of Drive Axle Housing For 32-Ton Mine Dump Truck

The driving axle housing is a main part of the vehicle chassis, which endures complicated loads while traveling. The main damage form of the axle housing is fatigue failure under cyclic loading. Due to the complex driving conditions, the designer can not accurately quantify the vehicle's whole use conditions and the force of the bridge shell, no way to accurately check the strength and life of the bridge. At the same time, the traditional design method can not accurately measure the parts in the structure of convex variable stress concentration effects of high stress point. All of these may reduce the fatigue life of the axle housing, and cause the fracture of the bridge shell, at the same time, resulting in a large economic losses and casualties.Based on the capacity of 32 tons of heavy mining dump trucks as the research object,aiming at the fault of the rear axle shell hanging ears lateral cracking, the material mechanics and theoretical mechanics theory are used to analyze the bridge shell static stress, and to obtain the stress values on the fracture section. In order to reflect the real effect of stress concentration on the stress of fault section, the 3D model of axle housing is established in CAD software Solidworks.Then the geometric model is built by Workbench finite element analysis software.The stress distribution and stress value of the fault section of the rear drive axle housing under typical working conditions are obtained. Based on the comparison between analytical calculation and finite element calculation results, the reasons for the fracture of bridge shell are analyzed. Fatigue life of axle housing is obtained by using the fatigue damage accumulation theory and approximate vehicle driving axle housing load spectrum,and the result is lower than the design requirements. Based on the results of the analysis and the existing conditions, the structure of the fault bridge is improved. The finite element static analysis and fatigue life evaluation of the improved bridge shell model are carried out, and the results show that the improved structure is reasonable.This will provide a more accurate theoretical method and basis for the design and test of the bridge shell, and be better for the mass production.