Dust explosions using AUTODYN
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1 Marcel Jagić, Heiko Beck, Armin Huß Ingenieurbüro Huß & Feickert GbR mbh Liederbach, Germany Page 1 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
2 Content Basics Introduction The investigated structure Modelling Results Conclusion Page 2 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
3 Explosions Combustion reaction Detonation - Supersonic Deflagration - Subsonic Dust explosions Maximal pressure up to 12 bar Combustible Material Explosion Velocities up to the speed of sound Oxidant Ignitionsource Page 3 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
4 Mode of Operation A Inlet of the Gas-Dust-Compound B Flow through the filter cartridge C Passing through the connection chamber D Outlet of the clean gas Page 4 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
5 Simplification of the geometry Creating a midsurface-model Shared topology for shared edges Dust filtration system by the company INFASTAUB Page 5 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
6 Creating a 2D-Midsurface Mesh, mainly made of quads Smallest element edge length: 21.5 mm Page 6 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
7 Strain-rate dependent material model for the steel S235JR true Stress true plastic Strain Page 7 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
8 Ignition and EOS (Equation of State) Jones-Wilkins-Lee EOS Ignition Page 8 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
9 Pressure wave propagation through the volume Page 9 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
10 Pressure variation in the measuring points Reaction front Pressure front Very good spread through the explosive volume Typical Pressure-Time-Curve of a dust explosion Page 10 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
11 Pressure variation in the measuring points No damping of the filter cartridge Waves oscillate longer Decreasing tendency of the pressure is observed Page 11 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
12 Effective plastic strain (scale to 1%) No critical plastic strain in the entire model < 1 % Very coarse mesh One element for the stiffener Page 12 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
13 Plastic deformation after a gas explosion Similar to a deflagration, therefore the same approach (JWL) Maximal pressure of 3 bar Plastic deformations in very good agreement Page 13 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
14 Outlook for further studies Flange connections with material failure More accurate model of the real structure Further studies of possibilities of simulating dust explosions (Powder Burn, JWL) Implementation of damping materials/elements Page 14 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
15 Conclusion Parameters of the material have to be optimized The program AUTODYN can be used for the simulation of a dust explosion AUTODYN cannot replace a real explosive test Page 15 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
16 Thank you for your attention Page 16 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
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