The Thermal-mechanical And Fatigue Damage Analysis Of Drum Brake

Brake is the main components of the vehicle brake system. which is widely used bycurrent commercial vehicles, The braking process is a typical thermal-mechanicalcoupling process.The coupled temperature and stress field analysis and calculation is animportant part of brake design and its results are the important theoretical foundation infor selecting friction materials. The paper simulated the thermal-mechanical couplingphenomenon for a ventilated drum brake and predicted the thermal fatigue life of the drum.Brake.Firstly,a ventilated drum brake which is currently widely used for passenger carswaschosen as an example,the 3-D model of drum brake system was established using thesoftware UG。And the thermal-mechanical coupled finite element model for brakingsystem was established using the non-linear finite element software Abaqus. It containsfour conditions:emergency braking continuous braking,twice emergency braking andbraking along long-distance downhill. The effect of the heat due to friction caused byrotational movement of the heat generation and distribution,the coupling of thetemperature,equivalent stress were taken into account during the course of numericalsimulation.And the change of the heat transfer coefficient for each interface of the forcedconvection state of the brake drum was taken into account.Secondly,based on the results of the simulation of the thermal-mechanicalcoupling,the distribution of the transient temperature,contact pressure and stress field ofthe drum were analyzed under the condition of the time-varying moving thermal load andthe convection heat transfer.With the alternating cycle of stress,the radial cracks which arecommon on the drum surface were studied.Finally,the thermal fatigue life of the drum was predicted according to Nsoft software.in emergency braking and continuous braking conditions.