Structure Design And Expermential Investigation Of Burst Composites Canister Cover

Missile launcher canister cover is one of the most important parts in the missile launchsystem.In usual storage, sealability of the entire missle laucher canister is keepped by the cover,Because of the function of canister cover, the leakage of the inert gas in canister is stopped andthe missile is also protected against the external factors. Canister cover needs to be timelyopening for releasing the channel with a range of space so that the missile can smoothly passthrough when the missile launchering.Traditional canister covers(include mechanical canistercover and blasting canister cover) have the defects of heavy weight、slow reaction of opening andhigh costs of maintenance, so that a trend of being substituted by lightweight composites canistercover for the advantage of lightweight、high strength and corrosion-resistant is inevitable. Inorder to reduce the weight of missile launcher system and improve the response capability of themissile forces, the purpose of widely used composites canister cover in missile launcher systemis achieved, structure design and performance analysis of a integrated bursting type oflightweight composite canister cover with the lauchering method of gas flowing are performed inthe thesis.The basic forms of composites canister cover in storage and burst condition are desginedaccording to the performance requirements of missile launch system in the first part of thisdissertation. The whole cover structure is mainly divided into three parts respectively namedprincipal part, weak structure, and remain part, and structural design on principal part and theweak structure are focuses in preliminarily research stage. Three programs of overall appearanceand structure for principal part are desgined so the performances of structural deformation, stressdistribution and stress constitute of the weak stucture of cover structure in three programs areinvestgated by the methods of charge-pressure experiment and numerical simulation, the roundcap structure is selected for the best comprehensive performances in three different structures. Aform of adhesively bonded is desgined to be the weak structure inter principal part and remainpart.Strength criterion for biaxial fiber-reinforced composites, the basic material of canistercover, is investigated in the second part of this thesis. The applicability of Tsai-Wu tensorcriterion in the field of biaxial fiber-reinforced composites is discussed and one of strengthparameters in criterion F12is defined and to be determined by biaxial load experiment. Overalldesign and parameter optimization of cruciform specimen are performed by the methods ofnumerical simulation and Taguchi experiment, so a type of cruciform specimen with the properties of high stress level at central weak region and small stress concentration factor isdesigned. The specimens are tested by some biaxial load experiments at different loading ratios.Strength parameters F12at different loading ratios are calculated by experimental strength dateand the failure envelopes with different value of F12are constructed in the first and thirdquadrants of the stress plane.Ply schemes in different region of the cover structure are further optimized in the third partof this thesis. Angles and number of layers in each region is respectively determined according tothe directions and levels of the internal forces under the condition of the structure subjected touniform internal pressure and then the finally structure of canister cover is defined. The stressconstitutie of weak structure under the condition of the structure subject to uniform internalpressure is analyzed, structural strength of nine weak structures with different structuralparameters are predicted under eleven conditions of different ratio of vertical and lateraldisplacement and the strength envelopes of weak structures are fittd by the results of numericalsimulations.In the beginning of the fourth part of the thesis, The basic theories and methods for solvingof approximate algorithm of Riemann and coupling relationship in the transient finite elementsoftware MSC. Dytran are described. A transient numerical model simulated the process of gasflow impacting the cover which uses Shock wave releasing by high-pressure gas ball to impactweak-prefabricated laminates model is established on the basis of this theory. Burst pressure andthe bursting-through performance of canister cover is obtained according to the results ofnumerical simulations, as a basis for analyzing the effect of weak structural parameters for burstpressure and further optimizating bursting-through performance by adjusting the circle ofstrength of the weak structure.Molding process of canister cover is also studied and Specimens of composites canistercover are manufactured in the fifth part. The performance of airtight、burst pressure and lateralthrowing are tested through charge-pressure experiment by self-designed equipment. Feasibilityof design program is verified by experimental data and phenomena, and reasons for theformation of the error are discussed by comparison of experimental data and numerical results.