| Explosion containment vessel is a pressure vessel that works in extreme conditions. It can restrict damage range of explosion shock waves and production of explosion, effectively protect the personnel and experiment equipment near from the explosion, make observing and testing explosion experiments convenient and safe, and enable recycle of test products to prevent environmental contamination. With the capacity development of explosion containment vessels, the inherent disadvantages of the single shell explosion containment vessels widely applied gradually reveal themselves. It is difficult and costly to manufacture, and to detect and eliminate deep weld seams. However, without the above shortages, composite explosion containment vessels have the dominant position of anti-fatigue, corrosion resisting, electrical insulating, damaged security and specific strength. Therefore, it is important and necessary to develop new type composite explosion containment vessels to fulfill the requirement of large capacity.Supported by National Natural Science Foundation project "Research on damage evolution and lifetime of composite cylindrical containment vessel under inner intensive explosive dynamic loading"(Project No.50875326) and "Predict on adiabatic shear transient evolution process and fracture morphology of explosion containment vessel"(Project No.51005201), blast loading regularity and dynamic response of composite explosion containment vessel were studied by numerical simulation in this thesis. The main research work and conclusions are summarized as follows:(1)A numerical calculation model for composite explosion containment vessel has been developed. First, the development history of composite materials and basic structure and advantages of composite explosion containment vessel were introduced. Second, the basic strength theory and failure criteria for monolayer composite and strength theory for composite laminates were discussed, which makes comparison about the applicability among these strength theories. Finally, the element types which are suitable for composite materials modeling in ANSYS and LS-DYNA, respectively, were represented. Based on three basic assumptions, the numerical calculation models for composite explosion containment vessel, respectively, were established in ANSYS and LS-DYNA.(2)Study on the internal explosive loading on composite explosion containment vessel. The calculation method for explosion field in LS-DYNA was elaborated. Based on the method, the fluid-solid coupling model for internal explosive loading of composite explosion containment vessel was established. And the blast loading regularity of composite explosion containment vessel under different TNT charges was computed. The result shows that the blast loading is not evenly distributed on the wall surface of composite explosion containment vessel, and is mainly on the cylindrical shell near the explosion center. Also, in a given structure size, there is good linearity between TNT charges and specific impulse on the surface near explosion center.(3)Research on the dynamic response of composite explosion containment vessel. With the numerical computation model, the dynamic response of composite cylindrical shell under different TNT charges was analyzed, and the result indicates that symmetric winding pattern of fibers can balance circumferential deformation and radial deformation, which lead to more uniform stress distribution and thus to make full use of material. Also a beating phenomenon was found in vibration of composite explosion containment vessel. Combining with the modal analysis, the possible cause for the beating phenomenon was interpreted. Although there is obvious beating phenomenon, the vibration of the structure maintains in elastic range, and the time of vibration lasts at100ms above, which contributes to convert the detonation energy absorbed by the container to the kinetic energy, and is helpful to improve the anti-explosion ability of the structure. |
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