Research On Damage Effects Of Container Equivalent Target Under Shock Wave

Demolition warhead is one of the most common conventional warhead,of which the realization of the damage effect on targets is dependent upon the parameters of blast wave.Thus,it is significant to investigate the mechanisms of action and damage rules of blast wave on typical military targets.Likewise,there are profound meanings for design,development,evaluation and application of the explosive weapon.Experimental study and numerical simulation are utilized in this paper to investigate the damage rules of blast wave with the aim of evaluating the damage effectiveness of demolition warhead.The main works are as follow:(1)A numerical method for simulating the propagation and damage effects of blast wave in field tests was established.That is,the uncoupled Lagrangian-Eulerian(ULE)method,which can be applied to overcome the limitation of low calculation accuracy in full-field simulation utilizing the Lagrangian approach solely.Meanwhile,on contrast to Fluid-Solid coupling model,it has the great advantage of reducing the costs of calculation.The method used for determined the dynamic response of the structure is combined of three steps;the first is to obtain the inflow characteristics of one-dimensional blast wave.In the following,get the pressure-time curves from varied locations on the surface of structures in a full 3D Eulerian flow model,which was modelled as perfectly rigid.At last,generate the novel pressure-time curve by averaging the data from the curves obtained in former stage and apply into pure Lagrangian simulation.It is shown that the calculation accuracy has high precision.(2)A series of full-scale blast tests were conducted.With the analysis on the characteristics of typical shelter targets and based on the Hoff principle of equivalent stiffness,a full-scale target was designed and managed into full-field tests.The Digital Pressure Recorder(DPR)was used to collect pressure-time curves during tests,which was transformed into attenuation law of pressure versus distance.Thus,the value of overpressure in different positions can be calculated and used to establish the correspondence between pressure and deformation/failure mode.It is shown that the panels on the blast side performed an extinct counter-intuitive behavior in an interval of scale distances,which deformed into the opposite direction of the blast loading.(3)Numerical studies were performed on investigating the damage effects of full-scaled targets based on uncoupled Euler-Lagrangian method.The dynamic response under different loading conditions was observed.Since the results obtained from numerical studies are in good agreement with the experimental data,the method appeared to be a proper arithmetic to describe such behavior under impulsive loading.The failure modes and the dynamic response of the targets subjected to blast loading were experimentally and numerically investigated in this paper.The damage rules of blast wave is revealed herein,which is practical in engineering.