Research on compressive behavior and optimization design of composite skirt
Axial compression tests were conducted on the ϕ150 mm composite skirt of a solid rocket motor case formed by autoclave process.A progressive damage FEM analysis incorporating viscous behavior and the three-di-mensional Hashin failure criterion was validated with test data such as failure mode,failure location,and axial com-pression load for both the composite skirt and the composite case with the skirt.Then a layup optimization model based on Random positive algorithm with layup limitation of composite skirt was established to obtain the optimal layup sequence and angle of composite skirt that meets design requirements.Subsequently,based on the optimal layup,the impact of different overlap angles and lengths on the load pattern was analyzed,determining the optimal overlap angle and length.Finally,The axial compression test results confirm that with a layup of[90/0/45/0/90/90/-45/-45/45/0],the composite skirt buckles before reaching the material strength limit,meeting design re-quirements.As the overlap angle increases,the buckling load rose steadily while the load increment increases ini-tially and then decreases.Ultimately,it was determined that the optimal lap angle and length are 3°and 20 mm,re-spectively.The final axial compression test buckling load for the composite case with skirt is 29.77 kN,differing by 6％from the simulation.The failure position at the tip of the composite skirt aligns with simulation results.
solid rocket motor casecomposite skirtstructural designlay-up optimizationaxial compres-sion properties
万方数据
维普
