Coupling Fatigue Durability Analysis Of The Muffler Thermal Stress

With the rapid development of China’s automobile industry, the performance of thecomponents on the car growing concern, Among them, the fatigue durability is animportant aspect of the performance of the components. Exhaust system, as an essentialcomponents of a car, its fatigue life issues have gradually become the focus of attention. Inview of the less study of exhaust system in this respect less domestic, and the great gapbetween the level of research over the same period abroad, so it’s necessary to strengthenresearch in the field to make up deficiencies in short term, research results obtained in theanalysis will add a certain extent to this field, and it can be the references of the overallmodeling of the exhaust system of Fatigue durability analysis.In this paper, the fatigue durability research results of the reference to domestic andforeign automobile exhaust system on the basis of the finite element method analysis ofthermal fatigue on a main muffler. Finite element mesh and the model used is the finiteelement mesh geometry clean up and then divided Hypermesh10, based on the CADmodel. In order to ensure the reliability of the finite element model, finite elementcalculation of modal and test Mode confidence check of the modal exhaust system hanginglug isolation rate test analysis. The reference was to the General Motors the GMW14202car exhaust system evaluation analysis process.In order to ensure the requirements of the general design of the exhaust system, is toensure that the NVH performance of the exhaust system, power and fuel economy.Confidence test after the modal model, established a CFD analysis model Hypermesh10times the pressure distribution analysis, the velocity and temperature field analysis to meetthe normal design of the exhaust system on the exhaust system.Using the same model to calculate the thermal stress of the main muffler. From thetrial on board to obtain the spectrum of the main muffler in the hanging of the vibration ofthe commonly used operating conditions as thermal fatigue analysis of an input boundaryconditions. And then import to various boundary conditions and heat stress results inANSYS.Dedignlife to complete the set of the material SN curve and load characteristics,the use of the Palmgren-Miner cumulative damage theory to complete the analysis ofthermal stress fatigue life of the main muffler.The improvement of the main muffler to the relevant recommendations for improvement based on analysis results, you can try for guidance to solve practicalengineering problems.