Mechanical Properties Research For Fiber Reinforced Composite Launch Canister With Liner

Modern military technology requires the ability of portable, mobile, flexible rapid response and omnibearing protective for future army weapon equipment, so new structural and functional materials will be developed. New materials begin to apply on launch canister. Fiber reinforced composite is most widely used because of high specific strength and specific stiffness, high corrosion resistance, high fail safety resistance, high fatigue life and designable. But resistance on erosin and sealing of fiber reinforced composite are poor, so fiber composite launch canister with liner is developed. The new type of composite structure is more widely used in army weapon equipment.In this dissertation, mechanical properties of fiber composite launch canister with liner are investigated, the main content includes the following several aspects:1) Tensile test, hydrostatic test and impact resistance test for two types of fiber composite launch canister with liner are designed, one is glass fiber composite launch canister with steel liner, the other is glass-carbon hybrid fiber composite launch canister with steel liner. Stiffness, strength and impact resistance parameters of launch canister are determined. The tests show that stiffness of glass-carbon hybrid fiber composite is higher than glass fiber composite; two types of strength failure modes exsit on fiber composite launch canister with liner; impact resistance of glass-carbon hybrid fiber composite launch canister with steel liner is worse than glass fiber composite launch canister with steel liner.2)3D equivalent elastic modulus for two types of fiber composite are derived, one is glass fiber composite, the other is glass-carbon hybrid fiber composite which considers hybrid effect. The calculating results for two types of fiber composite agree well with experimental ones, so hybrid effect must be considered for hybrid fiber composite.3) Mechanical properties parameters for two types of fiber composite launch canister with liner are calculated, including bending stiffness, burst pressure and radial impact displacement. Theoretical calculation results indicate that bending stiffness and burst pressure for glass-carbon hybrid fiber composite with steel liner are higher than glass fiber composite launch canister with liner, meanwhile, radial impact displacement of glass fiber composite launch canister with liner is consistent with impact resistance test.4) Mechanical properties parameters of launch canister by finite element simulation are analysed, including stiffness, strength and impact resistance parameters. At the aspect of stiffness properties,3D equivalent elastic modulus for glass fiber composite from finite element method is agree with theoretical calculation result and test result, but there exist errors between finite element analysis result and theoretical calculation result for glass-carbon hybrid fiber composite because hybrid effect is not considered in commercial finite element software, such as ANSYS. At the aspect of strength properties, working pressure and burst pressure for fiber composite launch canister with liner are agree with theoretical calculation results. At the aspect of impact resistance properties, radial impact displacement of glass fiber composite launch canister with liner is consistent with impact resistance test result.5) Influencing factors about mechanical properties of launch canister based on experimental research, theoretical calculation and numerical analysis are discussed. The analysis result shows that comprehensive mechanical properties of launch canister will increase with the growth of liner material parameters and liner thickness, but with the growth of liner thickness, mass of launch canister also increase significantly and bearing mode will change. Stiffness and strength properties of launch canister are determined by modulus and strength of fiber material, but impact resistance properties will decrease with the reduce of fracture toughness, meanwhile, strength properties will increase and stiffness, impact resistance properties will decrease with the growth of fiber thickness ratio and fiber winding angle. It is concluded that mutual restriction relationship exsit between stiffness, strength and impact resistance properties.