Fatigue Life Analysis Of SUV Body In White Based On Virtual Test Field

Body structure fatigue life analysis is a large number of car enterprises in the vehicle design and development of an important part of the durability of the body structure determines the vehicle vehicle safety and reliability,with good reliability and security will increase the car prices Brand value and then increase the market share of enterprises.The vehicle test field is the platform and foundation for the vehicle body fatigue analysis.The virtual test field is based on this.The new testing platform is established by computer technology to shorten the research and development cycle and reduce the detection cost.The vehicle virtual test field is carried out in the vehicle design stage Motion simulation,the fatigue life analysis of the body structure is the future development trend,this article to explore this direction,research.In this paper,through the establishment of virtual test field,vehicle vehicle multi-body dynamics model,the use of vehicle simulation fatigue life analysis of the load-time course.And then based on the body static analysis results,the white body of the fatigue life analysis of the overall idea.First of all,this article through the actual test site pavement analysis.The road model,which includes pebbles,Belgian stones,fish scales,washbasins,washboards,pulses,sine waves and so on,is established,and random variation factors are added to the two kinds of road surfaces,such as pebbles and fish scales,to form a more accurate virtual test field And get the road surface spectrum information needed for the simulation,and provide the road spectrum data for the simulation of the vehicle dynamics.Secondly,in the ADAMS software,the multi-body dynamics model of the vehicle is created,which is simplified into several subsystem modules according to the characteristics of the vehicle structure.The multi-body dynamics model of the vehicle is established and assembled.The kinetic model is placed on the virtual test site to simulate the simulation of vehicle driving,and the load spectrum of the vehicle-chassis critical connection point is simulated.Finally,the finite element model of SUV body is established,and the white body static analysis is carried out by inertial release technique.The fatigue life and durability of the SUV white body are obtained by combining the S-N curve of the vehicle body material,the vehicle key point load information and the static analysis result of the vehicle body.