Plastic Response of Thin-Walled Tubes to Detonation
Elastic and plastic deformation of tubes to internal detonations and the shock waves produced by their reflection were investigated. The study included experimental measurements as well as computational modeling. Tests with stoichiometric ethylene-oxygen mixtures were performed at various initial pressures and strain was measured on thin-walled mild-steel tubes. The range of initial pressures covered the span from entirely elastic to fully plastic deformation modes. A model for the pressure load on the tube wall was developed and tested against experimental measurements. This model was applied as a boundary condition in both a single degree of freedom model of the tube cross section and a finite element model of the entire tube. Comparison of computational and experimental results showed reasonable agreement if both strain-rate and strain-hardening effects were accounted for. A unique mode of periodic radial deformation was discovered and explained through modeling as the result of flexural wave interference effects.
© 2010 ASME. This research was sponsored by the Department of Homeland Security through the University of Rhode Island. DHSURI Center of Excellence for Explosives Detection, Mitigation and Response, Structural Response to Internal Explosions (URI Grant No. 12208-0001865, DHS Grant No. 2008-ST-061-ED0002), project officer Dr. Jimmie Oxley. Prof. Rusinek carried out the double shear testing of the tube material at the University Paul Verlaine of Metz.
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