Research On Creep Characteristics Of FRP Directional Device In Long-term Storage

Today's rocket weapons are highly destructive,highly mobile,and capable of meeting the requirements of multiple strikes on the battlefield.As a component that can be directly connected with the rocket in the rocket launching system,the directional device plays a role of supporting,protecting,storing,transporting and giving initial motion to the rocket when launching.Therefore,the structural reliability of the directional device is related to the combat performance of the whole rocket weapon system.In this paper,the glass fiber reinforced plastic directional device is taken as the research object,the creep constitutive model,creep test,creep finite element simulation and creep analysis under long-term storage were studied.Firstly,based on the analysis of the mechanical theory of GFRP composites,the viscoelasticity of FRP was determined by using a three-parameter solid model,based on the composite lamination theory and the principal curve shift factor method,the creep constitutive model of glass fiber reinforced plastic(GFRP)was establishedSecondly,based on the existing creep test results of FRP materials,combined with the creep constitutive model,the tensile creep test of FRP materials was designed and carried out,and the parameters in the constitutive equation were obtained.considering the influence of different stress and hygroscopicity,creep tests were carried out under the corresponding environmental conditions,and the displacement factors of stress and hygroscopicity were obtained.Then,the material constitutive model subroutine was written by the secondary development of finite element software,and the creep test data were used to simulate the GFRP material by ABAQUS finite element software,and the correctness of the subroutine and the theoretical model is verified.Finally,a finite element model for long-term storage of GFRP directional device was established in ABAQUS,and the long-term storage of FRP directional device was simulated and analyzed by combining the user material subroutine and relevant material parameters,the simulation results show that the structure performance of the directional device after long-term storage is analyzed.