Simulating lateral drift of a shaped charge jet in ALEGRA

• Published in: International journal of impact engineering Vol. 136; p. 103415
• Main Authors: Coppinger, Matthew J., Uhlig, W. Casey, Niederhaus, John H.J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.02.2020; Elsevier BV
• Subjects: ALEGRA; Density; Drift; Hydrocode; Parameters; Shaped charge jet; Simulation; Statistical modeling; Yield strength; Yield stress; Shaped charge jet; Hydrocode; Statistical modeling; ALEGRA
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2019.103415

•Stochastic variations were included in material parameters of a shaped charge jet.•Eulerian simulations impart modest lateral drift without material variations.•Density variations in shaped charge jet liners material significantly affect drift.•Asymmetries in a simulated shaped charge jet are visually apparent. This report investigates the ability of the shock multiphysics hydrocode, ALEGRA, to simulate the lateral drift of a shaped charge jet through stochastic variations of simulation parameters. Stochastic variations in the explosive density and the liner initial yield strength, fracture pressure, and density were introduced, and a method was developed to compare the magnitude of lateral drift between the simulations. The extent to which each of the material parameter variations affected lateral drift is presented and compared to a baseline simulation. Variations in liner yield strength, liner fracture pressure, and explosive density were found to impart a modest amount of lateral drift, while variations in the liner density imparted a significant amount of lateral drift.