Thermomechanical Modelling and Strength Assessment of C/C-SiC Composite Brake Disc

In this paper, a 1:1 bench test and finite element simulation of the C/C-SiC composite brake disc of a high-speed train are carried out. The results show that the surface temperature of the disc can reach 889 ℃ under emergency braking conditions with an initial speed of 400 km/h in the test and that the maximum surface temperature of the disc is 901 ℃ in the simulation. In the braking process, the maximum values of the maximum principal stress, radial stress and circumferential stress are 89.0 MPa, 77.3 MPa and 84.8 MPa, respectively. The preload of the connecting bolt between the disc and the metal parts decreased by 66% during braking and then slowly returned to the initial state. The progressive damage analysis of the composite brake disc was carried out by the Linde failure criterion and exponential degradation method. The results show that the C/C-SiC composite disc incurs no material damage failure during the emergency braking process and that the brake disc can meet the emergency braking requirements for a speed of 400 km/h or higher.