Study Of Tire Carcass Coupling Deformation Based On Tire Finite Element Model

The tires of a moving car run under combined working conditions, and showunsteady mechanical characteristics, which is mainly influenced by the elasticity oftire carcass. Regarding the influence of tire carcass’s lateral and longitudinal elasticityon tire unsteady characteristics on single glide direction, studies have been carried out,most of which, however, are based on Beam Model and String Model of tire carcass ormore general models with the superposition of translation deformation, bendingdeformation and torsional deformation. In this thesis, tire finite element model is usedto study the tire carcass deformation under pure working conditions, and then therelationship between tire carcass deformation and stress under such conditions isestablished. Such relationship will then be extended to combined working conditions,and necessary corresponding corrections are made to reveal the characteristic lateraland longitudinal coupling elasticity of tire carcass under combined workingconditions. The significance of this study lies in the fact that the study of lateral andlongitudinal elasticity of tire carcass under combined working conditions providesbasis for the modeling of tire unsteady characteristics under combined workingconditions and thus lays the foundation for the development of tire mechanics and theapplication of high-precision vehicle model in automotive development.The whole thesis is composed of six chapters.Chapter One introduces the researches on tire unsteady mechanical models athome and abroad, and the corresponding elastic models of tire carcass, as well aselaborates the tire unsteady cornering model which is based on String model of tirecarcass and proposed by a foreign professor Pacejka, and the theoretical model of tireunsteady cornering characteristics that is put forward by Chinese professor Guotaking into consideration of complex deformation of tire carcass.Chapter Two focuses on tire finite element modeling, introducing mainly thegridding and the selection of material model, and the input and output of thecommercial finite element software—ABAQUS in the finite element analysis of tire,as well as its application procedures in the design process of tire.Chapter Three presents the tests used to verify the tire finite element model,mainly including tire vertical stiffness test, contact patch test, tire lateral andlongitudinal stiffness tests, steady cornering test and the design process of thethree-dimensional loading test-bed, as well as the virtual test conducted under theseconditions. Comparative analysis has also been performed on the simulation resultsand test results. Chapter Four concerns the study of lateral and longitudinal deformation points oftire carcass based on the finite element model. First locate several node sets on theinternal surface of tire, and then conduct research and analysis of these node setsunder different working conditions. Finally decide on the set that characterizes tirecarcass deformation under different working conditions so as to be ready for thefollowing research and analysis of lateral and longitudinal coupling elasticity of tirecarcass.Chapter Five is the study of lateral and longitudinal coupling deformation ofrolling tire carcass. The first three parts show the study of the deformationcharacteristics of tire carcass under pure working conditions, and the establishedrelationship between tire carcass deformation and stress. The fourth part introducesthe extending of such relationship to different combined working conditions, andreveals the deformation characteristics of tire carcass under combined workingconditions.Chapter Six summarizes the whole thesis and points out the prospects of futureresearch.