Abstract
Under the load of an internal explosion shock wave, the failure of a cylindrical shell is the basis of safety evaluation and failure analysis of explosion vessel design. This paper carried out the explosion loading experiment of a cylindrical shell, and used the nonlinear dynamic finite element analysis program LS-DYNA for the dynamic response of the cylindrical shell along the directions of thickness and length, and analyzed the failure law of a cylindrical shell. The results showed that the deformation of the core section of the cylindrical shell was not different in the same specific distance, the strain decreased more slowly with the increase of thickness at the end of the explosion center, and the expansion failure process and fracture mode of metal shell under explosive load were affected by the material and structure size of the shell, as well as the characteristics and mode of the load. Based on the plastic theory, this paper discussed the evolution characteristics of the stress state during the expansion process of cylindrical shells under different explosion pressures, and analyzed the explosion pressure effect on the tensile fracture and shear fracture. The expansion failure experiment of a 20# steel-made cylindrical shell and the microscopic and metallographic analysis of the recovered debris were carried out.
Highlights
The dynamic deformation and crushing characteristics of metal cylindrical shells under an internal explosive load are of great theoretical significance and practical value
In the field of public security, to effectively limit the scope of explosion shock waves and detonation products, an explosion-proof container can be used to deal with suspected explosive objects [3,4]
The research mainly comes from the military field on the deformation, damage, and
Summary
The dynamic deformation and crushing characteristics of metal cylindrical shells under an internal explosive load are of great theoretical significance and practical value. Based on the experimental and numerical simulation methods, Hiroe [12] studied the effects of different materials, detritus structure, explosive energy, and initiation position on the deformation fracture of fragment the column shell. The was fracture characteristics of shells under different their elastic-plastic dynamic response was analyzed by using the nonlinear dynamic finite conditions have been barely studied in a systematical way [16,17,18] For this kind of dyelement software, their macroscopic deformation and fracture characteristics were studnamic-loaded cylindrical shell structure, there is no general criterion for evaluating the ied, and their fracture and mechanism under internal explosive were explored in fragility both at home mode and abroad this paper. The 20# steelmade test shellLoading featuring a high-quality carbon structure included chemical compositions
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