a theoretical and experimental study on the footprint analysis of a 185/65r14 radial tyre with tread pattern using finite element method

this research work is devoted to the footprint analysis of a steel-belted radial tyre (185/65r14) under vertical static load using finite element method. two models have been developed in which in the first model the tread patterns were replaced by simple ribs while the second model was consisted of details of the tread blocks. linear elastic and hyper elastic (arruda-boyce) material models were selected to describe the mechanical behavior of the reinforcing and rubbery parts, respectively. the above two finite element models of the tyre were analyzed under inflation pressure and vertical static loads. the second model (with detailed tread patterns) was analyzed with and without friction effect between tread and contact surfaces. in every stage of the analysis, the results were compared with the experimental data to confirm the accuracy and applicability of the model. results showed that neglecting the tread pattern design not only reduces the computational cost and effort but also the differences between computed deformations do not show significant changes. however, more complicated variables such as shape and area of the footprint zone and contact pressure are affected considerably by the finite element model selected for the tread blocks. in addition, inclusion of friction even in static state changes these variables significantly.