Many of the mechanical parts of cars and structures used in power plants, petrochemical industries, aviation, etc., are subjected to various cyclic loads such as low-cycle or high-cycle fatigue stresses. The most important failure factor in such parts is fatigue. Therefore, it is very important to investigate different methods of fatigue life eva‎luation. This research has been carried out according to the country's need for an axle housing part in the automotive industry and to prevent human and financial losses so that in the end it is possible to assemble axle housing that is suitable for the type of vehicle operation and avoid the waste of economic costs. We can use this research as preliminary research to enter the axle housing industry. In this research, the complete process of stress analysis, crack growth, and fatigue life in the part of the rear axle housing of the truck has been investigated. First, the axis chamber is modeled with CATIA software. Then, using ABAQUS software, a simulation is done on the container. The first stage is related to the simulation of stress analysis and determining the critical position of the chamber axis, and in the second stage, by placing a crack in the said critical position, crack propagation is investigated using the XFEM method and the Paris equation. In the next step, stress analysis related to the smooth and rough road is done in ABAQUS software and life estimation for the said conditions is done in Msc.Fatigue software. In this step, for smooth road conditions, fewer and smaller swing loads are applied to the axle housing. Also, for working conditions on rough roads or mine, compared to working on a smooth road, more and bigger swinging forces are applied to the axle housing. In the following, the analyzes have been carried out and in each step, the number of cycles that the container under load can withstand is eva‎luated. Said analyzes were performed using S460N material. This material is used in the process of making most of the enclosures. In the next step, to achieve the optimal fatigue life, the abovementioned steps are repeated for three different materials that are used to make certain models of the enclosure. Validation of the obtained results has been investigated and compared using experimental test results. In the last step, the study and eva‎luation of the effect of chamber construction methods on increasing the fatigue life of the rear axle chamber of the truck are investigated. In this study, in order to save national energy and the need to reduce pollutants, the study and way of reducing the weight of heavy trucks are investigated. Several parameters related to the hot stamping forming process of the movable axle housing of heavy trucks are investigated.

محمود فرزين

محمود فرزين , عباس قائي