Modeling Assumptions for Railguns

Insights from recovered armatures suggest re-examining historical modeling assumptions for railguns. The finite-element codes EMAP3D and DYNA3D were linked to explore the effects of temperature-dependent material properties, thermal diffusion, armature wear, inertial loading, thermal stresses, and 2...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2007-01, Vol.43 (1), p.380-383
Main Authors: Watt, T.J., Bryant, M.D.
Format: Article
Language:English
Subjects:
Applied sciences
Approximation
Armature
Current density
Electrical engineering. Electrical power engineering
Exact sciences and technology
Finite element methods
Heating
Inertial
Iron
Launches
Magnetism
Material properties
Mathematical models
Miscellaneous
Model assumption
Railguns
Temperature
Thermal diffusion
Thermal loading
Thermal stresses
Various equipment and components
Wear
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Summary:Insights from recovered armatures suggest re-examining historical modeling assumptions for railguns. The finite-element codes EMAP3D and DYNA3D were linked to explore the effects of temperature-dependent material properties, thermal diffusion, armature wear, inertial loading, thermal stresses, and 2-D model approximations. Temperatures and principal stresses for each of these cases were compared. Thermal diffusion and thermal stresses in armatures cannot be ignored past the first millisecond of launch; material properties under pulsed heating can significantly differ from equilibrium and room-temperature values. Armature wear and inertial loading can be ignored at low speeds, but not at high speeds (>1 km/s). Models in 2-D can approximate 3-D models with appropriate boundary conditions, but only for the first few milliseconds of launch. With a detailed EMAP3D model and minimal assumptions, simulations that agree within a few percentage points of microstructural measurements from recovered armatures are possible
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2006.887430