The Test Andanalysis On The Minimum Charge Quantity Of Destruction Of The Shell

In the modern military exercises and training, the artillery unit fired the shellscould be unexploded when they hit the targets, which caused by the fuze failure oroutside conditions did not meet the requirement. How to blast safely the unexplodedshells, eliminate the hidden dangers, the thorny issues were faced to the engineeringteam. The regular on-site process method: find or dig a deep pit, and tie the TNTexplosive which was fixed on the unexploded shells, by using the theory of explosivedetonation lure which could destruct the shells. However, when I referred to all kindsof unexploded shells destruction cases, I found that in order to destruct theunexploded shells successfully, they took larger value, by using the empirical formulacalculation of detonation dose which was larger than the actual quantity. In themodern battlefield, the limitation of man-portable TNT explosive and the uncertaintyof the ammunition supply restricted how to use the right amount of TNT explosive todestruct shells and save dosage, optimize blasting destruction of unexploded shells.For get in-depth understanding of explosives on shell effect and yielddeformation situation, I used the software ANSYS/ls-dyna to numerical calculation. Ittook ls-dyna Explicit2d Solid162unit as explosives and pipes. By using symmetricmodeling method, cross section of the steel tube and explosive model were set up.Steel pipe’s outside and inner radius was2.4cm and2.1cm respectively, and theexplosive radius was1.5cm. Then analyzed the explosive damage fracture gradientprocess of steel tube model. The steel pipe models of displacement, velocity, andacceleration had been carried on the preliminary analysis and discussion.In the test section, I took use of Q235low carbon steel as the artillery shellmodel, and the model for the No.2rock explosive emulsified explosive. The test sitewas in a certain mine deep mines. The first set of tests selected the five differentdiameters, but wall thickness was the same Q235steel tube. Using the empiricalformula to calculate the blasting explosive quantity needed for each steel pipe, andrevise the explosive quantity. Took the external loading, but internal unkitted charge.Internal assessment of steel pipe yield fracture after tipping, and preliminaryestimates a reasonable quantity of explosive. The second set of experiments, by selecting five specifications of the same tube which outer diameter was48.00mm,wall thickness was3.00mm. On the basis of the first set of experiments a reasonableestimate of quantity,1st model external loading was89.75g. And the other externalcharging model, reduce5g in turn, and internal charge was100g. After tipping,evaluating yield wall fracture and fracture. The test results: in the five models, theNo.1and No.2were yield, expansion fracture model. Their external loading quantitywere89.75g and89.75g. No.3to5model exceeded yield deformation. According tothe external loading quantity of the No.1and No.2model, I amended the minimumquantity calculation formula of destruction of the shell which is made of low carbonsteel. The achievement of the paper can provide the basis for the similar scene shellsdestruction.