Research On The Dynamic Response And Mechanical Model Of The Shell Under Internal Explosive Load

As a special type of sealed pressure vessels,the explosion containment vessels can effectively restrain the internal explosion process and the shock wave,fragments or toxic products inside the vessel.It can be used as a special safety protection component.Experimental research can also be used as a safe storage device for laboratory explosives.With the widespread application of explosive containment vessels in scientific research,production,public safety,it is necessary to conduct in-depth research on the dynamic response of explosive containment vessels.In this study,the combination of analytical solutions and numerical simulation is used to establish the mechanical model to predict the dynamic response of metal spherical and fiber composite cylindrical explosion containment vessels under the internal blast load.The main understandings obtained include the following aspects:(1)The single degree of freedom model is used to simplify the dynamic response process of the spherical explosion vessel under the implosion load to the dynamic response process of the elastic spherical shell subjected to the impact load.The mechanical analysis model of the dynamic response process of the elastic spherical shell is established and the radial displacement response is derived.Analytical solution,the analysis has obtained the important influence on the elastic dynamic response of the spherical shell:during the response process,the relationship between the first pulse pressure action time and the quasi-static pressure and its corresponding critical value determines whether the maximum displacement occurrence time is in the quasi-static pressure phase.Therefore,it is determined whether the maximum displacement is affected by the quasi-static pressure,and the maximum displacement value is affected by factors such as the quasi-static pressure amplitude,the first pulse pressure peak and the action time.compared with the case where the quasi-static pressure is not considered,the dynamic response process The minimum displacement and subsequent phase amplitudes are always affected by quasi-static pressure,but the frequency is not affected by quasi-static pressure.(2)On the basis of the elastic dynamic response of the spherical shell,the analytical solution of the dynamic response of the bilinear isotropically strengthened elastoplastic spherical shell is given,which are the two stages in the first pulse action phase and the quasi-static pressure action phase.The analysis of the situation shows the influence of quasi-static pressure on the elastic-plastic response process of the thin spherical shell.No matter which stage of the yielding moment,the maximum displacement occurs at different quasi-static pressure amplitudes,and the displacement increases when the quasi-static pressure increases.The displacement value and the subsequent response phase displacement minimum increase as the quasi-static pressure increases.Compared with the elastic response results,the quasi-static pressure has a more significant effect on the maximum displacement during the elastoplastic response process,but the quasi-static pressure action time in the subsequent two stages has no effect on the maximum deformation amplitude in the subsequent stage.(3)Based on the multi-layered model and the effective modulus method of the fiber composite cylindrical shell,a simplified double-shell model suitable for the dynamic response process of the composite explosive container under the implosion load is proposed.The analytical solution of the dynamic response of the fiber-reinforced composite cylindrical shell with metal lining under the action of internal radial uniform triangle pulse is in good agreement with numerical simulation results.