Abstract
Numerical analysis is conducted on the damage effect of the cylindrical shell under the combined action of fragments and shock waves. Preformed holes are used to simulate the failure effect of fragments. Three different damaged modes are obtained in the numerical simulation, namely, local depression deformation, coupling of local depression deformation and global deformation, coupling of global deformation and local penetration. When the shell is subjected to large explosive energy, the cylindrical shells with preformed holes are more likely to produce fragments than those without preformed holes; when the shell is subjected to a small explosive energy, the cylindrical shell with preformed holes has smaller sunken deformation than that without preformed holes.
Highlights
The metal pipe is widely used in the field of pipeline transportation for its unique configuration and function
The results show that the steel cylindrical shell with openings has a large stress concentration at the openings subjected to the explosion impact loading, which results in impact damage
When the stand-off distance is adjusted to 3 cm, the wall of metal tube with preformed hole will produce local deformation of depression subjected to the explosive impact, and the shape of depression area is approximately elliptical
Summary
The metal pipe is widely used in the field of pipeline transportation for its unique configuration and function. The cylindrical shell structure, which is used to transport liquid and gas in the pipeline network, will produce large plastic deformation and partial or whole fracture damage under the action of bomb fragments and shock wave. Liu G. et al [2] studied the deformation failure mode of helicopter gunships subjected to the combined impact loading of shock waves and fragments, and the damage effect of target caused by warhead when fragments attack the target before the shock waves. In order to provide reference for the safety protection of oil pipeline under the combined action of explosion and fragment, the preformed round hole is used to simulate the impact penetration effect of structure surface, observe and record the deformation and failure mode of cylindrical shell, and discuss the impact of stand-off distance on shell deformation
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