The influence of tread braking heat on the strength of elastic wheels for subway elastic wheels was studied.A solid finite element model of the subway elastic wheel was established,and three consecutive emergency braking carried out to check the static strength and fatigue strength of the elastic wheel,and analyze the influence of the thermal stress of the wheel tread on the wheel stress and the change characteristics under different degrees of wear.The results show that the thermal stress of the elastic wheel brake has a significant impact on the rim.Compared with only considering mechanical stress,the maximum von Mises stress of the new wheel rim considering thermal stress and mechanical stress increases by 98.9%,48.3% and 70.9% respectively under straight,curve and turnout load conditions.Compared with only considering mechanical stress,the maximum von Mises stress of the worn-to-limited wheel rim considering thermal stress and mechanical stress increases by 48.2%,13.7%,36.9% respectively under straight,curve and turnout load conditions.The stress value of the worn-to-limited wheel is large,but the influence ratio of thermal stress is small,which meets the static strength requirements.The temperature rise of the wheel core and the mounting ring is small,both less than 0.1 ℃,and the stress changes are small.The Goodman curve was used to evaluate the fatigue of the rim.It is found that the safety factors before and after considering the thermal stress is 2.7 and 2.5 respectively,both meet the fatigue check requirements.Affected by the thermal stress of tread braking,the position of the most dangerous point on the rim is different from that when only mechanical stress is considered.The position of the most dangerous point is transferred from the inside of the rim to the outside of the rim by the influence of the thermal stress of the thread brake.