Marcel Jagić, Heiko Beck, Armin Huß Ingenieurbüro Huß & Feickert GbR mbh Liederbach, Germany Page 1 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
Content 25.10.2012 Basics Introduction The investigated structure Modelling Results Conclusion Page 2 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
Explosions 25.10.2012 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
Mode of Operation 25.10.2012 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
25.10.2012 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
25.10.2012 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
Strain-rate dependent material model for the steel S235JR 25.10.2012 true Stress true plastic Strain Page 7 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
Ignition and EOS (Equation of State) 25.10.2012 Jones-Wilkins-Lee EOS Ignition Page 8 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
Pressure wave propagation through the volume 25.10.2012 Page 9 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012
Pressure variation in the measuring points 25.10.2012 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
Pressure variation in the measuring points 25.10.2012 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
Effective plastic strain (scale to 1%) 25.10.2012 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
Plastic deformation after a gas explosion 25.10.2012 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
Outlook for further studies 25.10.2012 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
Conclusion 25.10.2012 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
Thank you for your attention Page 16 / 16 ANSYS Conference & 30 th CADFEM Users' Meeting 2012