In order to study the interface failure mechanism of rubber cord composites laid at symmetrical angles, a representative volume element was established by the finite element method to simulate the stress distribution at the mesoscopic level of rubber cord composites. The energy-based power law is used to simulate the damage evolution of the cord-rubber interface. The results show that the interface damage is caused by the torque that the cord bears during the stretching process, and the interface assumes the role of transmitting torque in this process, so the failure occurred.The initial interface stiffness is a vital bonding interface parameter that affects the interface damage evolution, and the initial stiffness is positively correlated with the interface damage evolution variable. The increase in the included angle of the cord will cause the torque on the cord to increase, resulting in aggravated interface failure

Keywords: Rubber/cord, Symmetrical angle laying, Finite element, Representative volume element, Cohesive contact, Damage evolution