Abstract:
"The Interpretation of Separation Mechanism of Ridge-Cut Explosive Bolt Using Software Simulation Program"
This paper presents the development and validation of a numerical interpretation processor for analyzing the separation mechanism of a ridge-cut explosive bolt under transient dynamic loading. The study employs several software programs, including AUTODYN V4.3, SolidWorks 2003, and TrueGrid V2.1, to create a computational model that simulates the complex phenomena involved in an explosive bolt's operation, such as material failure and separation. A key finding is that a proper failure model is necessary to accurately simulate the behavior of the bolt under dynamic loading conditions, with the principal stress being the fundamental factor for failure. The research demonstrates that the failure stress of the 17-4PH material, calculated through the interpretation processor, is approximately twice the static tensile stress, which correlates well with actual experimental results. The study also explores different explosive bolt models with varying amounts of explosive material and shapes, comparing simulation outcomes with experimental test results, and shows that the interpretation processor can accurately predict separation and fragmentation. The detonation of explosives creates a shock pulse that gives rise to a specific type of fracture mechanism in ridge-cut designs. The paper explains this mechanism by detailing how relief pulses, generated from the shock, converge at a meeting site, causing particles to part company based on their individual kinetic energies, without the need for tensile stress. The developed interpretation processor is an accurate and effective analysis technique for evaluating the separation mechanism, which can help designers optimize the shape and explosive charge of explosive bolts, thereby reducing the time and cost associated with physical production and testing.
