Research of the stress-deformed state of a protective shell structure upon impact of shell fragments
DOI:
https://doi.org/10.32347/2410-2547.2026.116.283-290Keywords:
protective shell structure, shell fragments, impact force, finite element method, stress-deformed stateAbstract
Modeling of influence of shell fragments on the protective structure state is difficult and not sufficiently studied. This is due to the presence of wide spectrum of structural decisions of the constructions and different types of ammunitions. Ammunitions have different physical and technical characteristics, such as: a diameter, length and mass of the shell; a type and mass of explosive in TNT equivalent; a type and mechanical characteristics of shell material; time of detonation; amount and mass of fragments with maximal flight length and velocity. The amount of fragments depends on a construction a shell, which is increased with the increase of shell caliber, power of explosive, coefficient of filling and diminishing of strength and viscosity of shell metal. Therefore, in connection with the probabilistic parameters of shell fragments, kind and dispersion area on the surface of protective construction, it is necessary to apply the methods of probability theory and experimental test data. In article the stress-deformed state of the protective shell structure upon impact of shell fragments was investigated. Characteristics of shell fragments and their distributing on the affected construction area according to empiric formulas and experimental test data were determined. Static and dynamic behavior of protective shell structure upon impact of shell fragments was investigated in the software of finite element analysis NASTRAN. The nonlinear static problem and static stability of shell structure taking into account elastic-plastic property of its material were solved by the Newton-Raphson method and the Lanczos method respectively. The dynamic calculation of protective shell structure contained determination of forms and frequencies of natural vibrations using the Lanczos method and investigation of forced vibrations by the Newmark method. Characteristics of the stress-deformed state of protective shell structure and realizations of its reactions on the action of shell fragments were received. The presented numeral method simplified the process of modeling of shell fragments action on the protective construction and allowed to research its stress-deformed state.
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