Study on finite element modeling of fiber composite external shell of rocket sled

Abstract Due to the complex mechanical environment of rocket sled test, there are some difficulties in the application of fiber composites in this field and some shortcomings in theoretical aspects such as computational simulation. This article studies the modeling of fiber composite external shells for rocket sleds. Firstly, the displacement field and constitutive relationship of the fiber composite external shell were established. A theoretical model of the rocket sled fiber external shell was established based on finite element theory. Then, according to the overload condition of the rocket sled test, the boundary conditions are applied to the model. Finally, the vibration test system is used to test the external shell test sample for model verification. The results show that the natural frequency error of the theoretical model is less than 5%, and the modal shapes exhibit a high level of consistency, which can prove the accuracy of the theoretical model established in this paper. Thus, the correctness of the proposed method was verified.