Coupled discrete/continuum simulations of the impact of granular slugs with clamped beams: Stand-off effects
| Autor: | A. Goel, Haydn N. G. Wadley, Tao Liu, Vikram Deshpande, T. Uth |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
02 engineering and technology Granular material Physics::Fluid Dynamics 0203 mechanical engineering Deflection (engineering) Fluid-structure interaction Fluid–structure interaction Landmine medicine General Materials Science Discrete particle simulation Instrumentation Particle impact Continuum (measurement) Velocity gradient Elastic energy Stiffness Mechanics 021001 nanoscience & nanotechnology Blast 020303 mechanical engineering & transports Classical mechanics Mechanics of Materials medicine.symptom 0210 nano-technology Beam (structure) |
| Zdroj: | Mechanics of Materials. 116:90-103 |
| ISSN: | 0167-6636 1872-7743 |
| Popis: | Coupled discrete particle/continuum simulations of the normal (zero obliquity) impact of granular slugs against the centre of deformable, end-clamped beams are reported. The simulations analyse the experiments of Uth et al. (2015) enabling a detailed interpretation of their observations of temporal evolution of granular slug and a strong stand-off distance dependence of the structural response. The high velocity granular slugs were generated by the pushing action of a piston and develop a spatial velocity gradient due to elastic energy stored during the loading phase by the piston. The velocity gradient within the “stretching” slug is a strong function of the inter-particle contact stiffness and the time the piston takes to ramp up to its final velocity. Other inter-particle contact properties such as damping and friction are shown to have negligible effect on the evolution of the granular slug. The velocity gradients result in a slug density that decreases with increasing stand-off distance, and therefore the pressure imposed by the slug on the beams is reduced with increasing stand-off. This results in the stand-off dependence of the beam's deflection observed by Uth et al. (2015). The coupled simulations capture both the permanent deflections of the beams and their dynamic deformation modes with a high degree of fidelity. These simulations shed new light on the stand-off effect observed during the loading of structures by shallow-buried explosions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect