Patent ID: 7149670

Claim:
A method for tire rolling simulation comprising the steps of: setting a tire model by modeling a tire with the use of elements capable of numerical analysis; setting a road surface model including a road-surface matter model formed by modeling road-surface matter forming a road surface with the use of elements that can be numerically analyzed and can cause a volume change due to compression which is substantially permanent; setting a requisite condition for performing a tire rolling simulation by making said tire model get in contact with said road-surface matter model; performing the tire rolling simulation based on the requisite condition, wherein the tire rolling simulation comprises the steps of: calculating deformation of the rolling tire model at minute time increment intervals; calculating deformation of the road-surface matter model at minute time increment intervals; exchanging at least one result of individual deformation calculations between the tire and the road-surface matter models to couple these models; setting a yield function by using a first invariant and a second invariant of the stress tensor each acting on at least one element in the road-surface matter model; determining whether deformation of the at least one element in the road surface matter model is in a plastic region or elastic region based on the yield function; and reducing the stress of the at least one element in the road-surface matter model based on the yield function when the deformation of the at least one element has been determined as in the plastic region, wherein each said calculating step comprises the steps of: calculating a stress wave propagation time of each deformed element; and changing the time increment for next calculation based on the minimum value of the stress wave propagation time.