Structural Design and Impact Simulation of Glass Fiber Fragile Cover of Rocket

Abstract The fragile cover of rocket not only has the characteristics of sealing and high-temperature resistance, but also can break according to preset scratches when hited by the rocket’s head. In this paper, a penetrating glass fiber fragile cover with scratches is designed, and six structural types are set up with the number of layers laid by glass fiber as independent variables. Based on Hashin failure criterion and damage evolution law, the finite element method is used to simulate the process of rocket breaking through fragile cover and gas flow impinging fragile cover. The results show that the fragile cover will break along the preset scratches, which does not produce debris to interfere with rocket launch. As the number of glass fiber cloth layers increases, the Mises stress of the rocket’s head increased when the fragile cover broken. The impact of the gas flow on the fragile cover of the adjacent pipe is not uniformly distributed, and the maximum value of the Mises stress appears at the scratches of the cover body. As the number of glass layers decreases, the failure index value of the fragile cover under the impact of gas flow increases. The research provides a reference for the design of rocket glass fiber fragile cover.