Reaction of the loaded shell of rotation with the rigid nose of the apparatus to a shock wave in a liquid

The materials of the article contain the results of an assessment of the stress-strain state, internal equivalent forces and moments of an elastic shell of rotation of a parabolic shape under its dynamic loading by a moving excess pressure front propagating along the axis of symmetry. The nasal part of the shell is reinforced from the inside by a rigid parabolic insert. The presence of a massive object (nose insert) in a dynamic system introduces additional disturbances into the process of unsteady propagation of disturbances in a thin-walled shell. The parameters of the interaction of the shock wave with the surface of the structure are highly localized, as typical time of the process does not exceed 20 milliseconds. The magnitude of the acting moving load on the shell is determined by the function of the total pressure, adjusted using the Heaviside function. The calculation results are given for the option of sealing (rigid fastening) the end of the shell on a fixed mating part. The values of the internal force factors for shells with three versions – 3, 5 and 7 mm thick – are presented in a dimensionless form. The illustrations show the dependences on the time elapsed since the beginning of interaction with the shock wave of the bow for internal forces and bending moments. The nature of the propagation of elastic perturbations in the wall is determined by their superposition and re-reflection, the nature and amplitude of the waves of which depend on the configuration of the wall itself, the conditions of fixation and the parameters of the action of external overpressure. The results of calculating the distribution of force factors along the length of a thin-walled shell at the time when they reach their maximum values in absolute terms are also given. The nature of the overall design change can be obtained by analyzing the final graph, which shows the time changes in the values of the movements of the rigid nose in the longitudinal direction.

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