Research On Fatigue Reliability Analysis Of A Heavy Vehicle Drive Axle Housing

Drive axle is an important part of the transmission system of heavy vehicle,which has a very important role in the safe and stable operation of the vehicle.As a carrier,a load-bearing part and the installation of the substrate,it should ensure a sufficient strength and rigidity.It belongs to a relatively weak link and is easy to damage in the actual work environment,so we need to focus on the fatigue life of the axle housing.In this paper,the fatigue reliability analysis of driving axle housing for heavy vehicle is studied,the topic has important theoretical significance and practical application value.The object of this paper is welded after stamped,Moreover,the results based on the finite element method of predicting the weld life are not accurate,we need use more stable and effective Methods for the axle housing.Finally,the main body of the axle housing is stamped,and the thickness of the axle housing is large dispersion.It may cause hidden danger to the safety of the axle housing structure.The influence of the thickness on the fatigue reliability needs to be studied.In this paper,the driving axle housing of a heavy-duty vehicle is taken as the object of study.Based on the finite element analysis method,the fatigue life of the driving axle housing is analyzed under bench test conditions and a more accurate method is used to evaluate the bridge shell welding.The influence of the thickness of the axle housing on the fatigue reliability is studied by means of the shell element division and the piecewise processing mode.The main work is as follows:The first is to divide the model of the drive axle with shell element in workbench and complete the drive axle of ten equal pieces through the establishment of equal interval datum,carry out the stress-strain analysis and modal analysis of the finite element model.Secondly,the fatigue life of the welded joint of the drive axle housing is analyzed by using theFE-WELD to verify the satisfaction of the fatigue life of the axle housing,based on the equivalent structure stress and the main S-N curve method.Finally,regard the drive axle main material modulus Poisson’s ratio,two load and ten thickness values as input random variables,select the central composite design method of Six Sigma Analysis module in Workbench and conduct the simulation analysis on the reliability of the drive axle.Analysis the output file and get the probability distribution function of the target variable and the sensitivity relationship with the input variables,especially the ten thickness and the target variable.