Fatigue Analysis Of A Certain Car Aluminum Alloy Wheel

As the main load-bearing component in the wheeled driving system of the automobile,the wheel is subjected to the dynamic load for a long time in actual operation,and fatigue failure is the main cause of damage and is highly valued by the industry.At the same time,under the premise of ensuring the safety performance,wheel lightweight is of great significance for enterprises to save costs and improve the overall performance of the car.In this paper,the fatigue life prediction and structural lightweight optimization of a car's aluminum alloy wheel are mainly carried out.The dynamic characteristics of the wheel under different constraints are analyzed,and the natural frequency and vibration mode of the wheel are obtained.The influence of different driving speeds is evaluated by pre-stressed modal analysis.It is concluded that the influence of inertial force on the structural response is negligible,and system resonance does not occur at any speed.The static analysis of the wheel under two conditions was performed.One mainly considers the cosine-type radial variable load and tire pressure that transmited by the tire;the other mainly considers the influence of the bending moment and the bolt pre-tightening force.The stress and deformation under different working conditions are analyzed,and the wheel strength and stiffness meet the requirements,and there is a large design margin.Based on the results of finite element analysis and fatigue damage theory,the ANSYS nCode DesignLife software was used to simulate the fatigue of the wheel by the nominal stress method,and the fatigue danger zone distribution under different working conditions of the wheel was obtained,mainly in the middle and inner bead seat of the spoke.The inner rim and other places,and the fatigue life far exceeds the national standard requirements.The reliability of the simulation was verified by the fatigue bench test.Based on the results of structural analysis and optimization theory,the wheel spokes are topologically optimized,and some materials at the end and the rim bond area are removed,which achieves the purpose of weight reduction.The research done in this paper has certain practical significance for the structural design and fatigue life prediction of the wheel,and has certain reference value for the lightweight of the wheel.