NUMERICAL INVESTIGATION OF THE DEFORMATION CHARACTERISTICS AND HEAT-GENERATION IN PNEUMATIC AIRCRAFT TIRES .2. THERMAL MODELING

A numerical procedure to determine the temperature rise in aircraft ti res under free rolling conditions is presented in this article. Energy dissipation from cyclic inelastic deformation is considered the main heat generation source. This modeling considers the deformation proces s of the tire to be a steady-state problem, where all concurrent cycle s are assumed to be the same as the first. The inelastic energy is det ermined by imposing a phase lag between the strain and the stress fiel ds. The phase lag is assumed to be frequency independent in the range of interest, in keeping with the experimental observations in aircraft tire materials. It is further assumed that the inelastic energy is co mpletely converted into volumetric heat input for a transient thermal conduction analysis. A conduction model is described and results are c ompared against thermocouple data recorded by Clark and Dodge [1].