Electromechanics in LS-DYNA R7

Transcription

1 Electromechanics in LS-DYNA R7 Information Day, Gbg,

2 General

3 Electromechanics in LS-DYNA R7 Available in R7.0.0 Eddy Current Solver Inductive Heating Solver Resistive Heating Solver Fully implicit Double precision Automatically coupled to mechanical and thermal solvers All solvers work on solid elements (hexa, tetra, penta) Shells may be used for insulator materials All solvers work in smp and mpp 2D axisymmetric elemens availabe LS-PrePost Fringe plot, vector plot and element histories EM-fields Joule heating Magnetic force

4 Electromechanics in LS-DYNA R7 Scource Application Imposed current vs. time Imposed voltage vs. time R, C, L, V0 circuit Imposed current defined by amplitude and frequency Imposed voltage defined by amplitude and frequency External magnetic or electric field Contacts EM contact with contact resistance Permeability Constant Defined by curve as a function of B and H

5 Electromechanics in LS-DYNA R7 General physics

6 Electromechanics in LS-DYNA R7 General physics Consequence: Solver coupling is needed!!!

7 Electromechanics in LS-DYNA R7 Solver interactions

8 Electromechanics in LS-DYNA R7 Equations Coupling Maxwell equations with Eddy Current approximation B E t H B E j j E B j H j s 0 Faraday E Ampere t } Gauss Ohm Mechanics: Extra Lorentz force D u f j B Dt Thermal: Extra Joule heating D Dt : pl Dq Dt j 2 EOS: Conductivity vs temperature (and possibly density) ( T, )

9 Electromechanics in LS-DYNA R7 Solvers and applications Test

10 Eddy current solver Solver interactions

11 Eddy current solver Magnetic Metal Forming (MMF) One sided die MMF:High velocity forming process: Forming limits increased Springback reduced Wrinkling reduced High reproducibility

12 Eddy current solver Magnetic Metal Forming (MMF) Free forming Experimental result Numeric result In collaboration with: Ibai Ulacia, University of Mondragon, Gipuzkoa, Basque country

13 Eddy current solver Magneto crimpling In collaboration with: SAPA Technology AB, Finnspång, Sweden

14 Eddy current solver Railgun simulations

15 Eddy current solver Levitation: Magnetic metal welding: Ring expansion: Magnetic metal bending:

16 Inductive heating solver Assume high frequency current compared to simulation time Full Eddy Current solution on 2 periods Average of magnetic field is computed on the 2 nd period Joule heating is computed on the 2 nd period No change in material properties for the next periods is assumed Next Eddy Current solution at t=em macro time step marcus.lilja@dynamore.se

17 Inductive heating solver Inductive heating of plate In collaboration with: M. Duhovic, Institut für Verbundwerkstoffe, Kaiserslautern, Germany Thermal images from experiment LS-DYNA temperature fringes

18 Inductive heating solver Continuous Induction Welding Heating by Joule losses Pressure applied for consolidation and maintained during cooling In collaboration with: M. Duhovic, Institut für Verbundwerkstoffe, Kaiserslautern, Germany

19 Resistive heating solver Simplified version of the Eddy Current solver Only resistive effects are computed (no inductive effects) For slow rising currents in a part connected to a generator (no coil) No BEM system is needed Very large timesteps may be used Joule heating is computed No magnetic forces are computed

20 Resistive heating solver Resistive heating of plaque Rotating Wheel EM resistive heating problem, EM contact between wheel and plaque allowing current flow, Temperature Current density flow

21 Fluid solver coupling in R

22 ICFD interaction One code for Multiphysics Solutions

23 ICFD interaction Heating of water EM heats up a coil plunged in a kettle ICFD with congugate heat transfer heats up the water Water stream lines colored by the temperature level

24 Development

25 Development Magnetostatics solver Eddy current with infinitely fast diffusion Magnetostatics solver coupled with non-linear materials for: Electric motors Magnetic brakes Magnetic valves Magneto-inductive sensors

26 Development Magnetic materials Certain type of conductors exhibit a magnetization behavior in response to an applied magnetic field H. These magnetic materials have a permeability μ μ 0 μ d < μ 0 for diamagnetic materials μ p > μ 0 for paramagnetic materials μ f for ferromagnetic materials (non-linear)

27 Development Axi-symmetric capabilities Solver technology New GMRES solver Symmetry conditions Usage of symmetry plane(s) to decrease model size

28 Thank you!