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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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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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container_title	IEEE transactions on magnetics
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creator	Watt, T.J. Bryant, M.D.
description	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
doi_str_mv	10.1109/TMAG.2006.887430
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source	IEEE Xplore (Online service)
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
title	Modeling Assumptions for Railguns
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