Rolling Dynamics And Thermo-mechanical Coupling Analysis Of Radial Aircraft Tire

With the vigorous development of the aviation industry in our country,the number of civil and military aircraft has gradually increased these years.As the only part contacting with the ground,aircraft tires directly affect the safety of aviation navigation.Therefore,the research on the safety performance of aircraft tires is indispensable.In this thesis,the finite element software is used to conduct static,steady-state rolling and thermo-mechanical coupling analysis on radial aircraft tires.The main research works are described as follows:Chapter 2 constructs the finite element model and analyzes the static performance of the tire.The Bridgestone radial aircraft tire is cut and measured,and then the new tire model is established refer to it,named Super Tire-Model1(STM1).Mesh generation is performed to create a two-dimensional axisymmetric finite element model.Rubber samples are taken from each component of the aircraft tire,and stress-strain data are obtained through uniaxial tensile tests.The Mooney-Rivlin constitutive model is used to fit the experimental data and obtain material parameters for finite element computation.The tire is subjected to inflation analysis to predict the tire burst location.Furthermore,the static grounding analysis can evaluate the tire safety performance by using nine indicators,such as the contact area and the contact pressure.Chapter 3 presents the finite element analysis for the tire steady-state rolling.Performing steady-state rolling analysis using Abaqus software,which includes obtaining steady-state rolling angular velocity and effective rolling radius.The effects of velocity on tire pressure depth,ground contact patch distribution,contact pressure,and the principal stresses of rubber and cord were studied to correspond to the radial stiffness,wear position,and burst position of the tire.Longitudinal slip and lateral deviation conditions of aircraft tire are also studied to obtain the variation between longitudinal force and longitudinal slip ratio,lateral angle and lateral force and self-aligning torque.Besides,the effects on the distribution of contact patch and contact pressure are also obtained for the above two conditions.Chapter 4 performs the thermo-mechanical coupling finite element analysis of the tire.The heat source of thermo-mechanical coupling is derived from the hysteresis loss of rubber during the steady rolling of tires,which generates approximately 95% of the total dissipated energy in the form of heat.Excessive temperature causes the damage to the tire from both mechanical performance and chemical reactions.The heat production rate formula is derived,and the thermal analysis model and thermal boundary conditions are established to compute the temperature distribution of the tire.The temperature at the shoulder of the tire is the highest and is prone to bursting during steady-state rolling.Reasonable design of the tire structure and adjustments in material selection can reduce the risk of danger.Finally,the thesis is summarized and prospected.