Altair Radioss Explicit Solver
Altair Radioss Explicit SolverInnovationIntelligence Dmitry FokinSenior Application SpecialistMarch 2016fokin@altair.de
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Agenda1. What is Radioss Explicit Solver2. Material Laws and Rupture Criteria3. Fluid Structure interaction4. Multi-Domain5. Scalability / Repeatability6. Advanced Mass Scaling7. Example: drop test on a composite glass plate
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Altair ingBlastFSIGravitySpringbackDesign and OptimizationSmart Multi-Physics
LinearRADIOSS(Rigid & Flexible Bodies)Kinematics, Static and Dynamic, Quasi-staticMulti-Body DynamicsFluid Structure Interaction (FSI),Thermal Stress, MultibodyThermal and CFDImpact, Thermal, Materials, ContactNon-Linear (Explicit)Quasi-static, Dynamics,Post-buckling, Materials, ContactNon-Linear (Implicit)Statics, Dynamics, Buckling,Thermal, Plasticity, Quasi-static, ContactCopyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS is a Complete Finite Element Solution in HW
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS – used in more than 900 companies – RADIOSS in the automotive industry
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS is a Complete Finite Element Solution in HWAccess RADIOSS from HyperWorks Suite:RADIOSS ManualsLaunch RADIOSS
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.An example of problem that can be solved in Radioss Sphere drop (41kg) on a brittle plate (glass) Initial velocity of the sphere 5m/s The plate is composite glass and fixed on the edges Units: T, mm, s Elasto- plastic material Johnson Cook Failure criterion Crack propagation This problem is considered in details on seminar (data available if you need)
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Structure of Radioss modelModel set up is similar to other explicit solversCONTACT INTERFACESSPRINGS/ DAMPERSSPOT WELDS JOINTS,etc.BOUNDARY COND.STONE WALLSPROPERTIESMATERIALS, FAILURESPART IIPART IGROUNDTIME STEPSIMUALATION TIME
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.How to create Radioss modelType ASCII file (for real experts )#RADIOSS STARTER#---1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7---- ----8---- ----9---- ---10---- /BEGINmodel21400kgmmmskgmmms#---1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7---- ----8---- ----9---- ---10---- #- 1. CONTROL CARDS:#---1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7---- ----8---- ----9---- ---10---- /TITLEScaled F furnace with SPH#---1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7---- ----8---- ----9---- ---10---- Etc.Use HypermeshUse Hypercrash
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Agenda1. What is Radioss Explicit Solver2. Material Laws and Rupture Criteria3. Fluid Structure interaction4. Multi-Domain5. Scalability / Repeatability6. Advanced Mass Scaling7. Example: drop test on a composite glass plate
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Material library in RadiossMetallic alloys Law 1 : elastic material Law 2 : elasto-plastic material Law 27 : elasto-plastic brittle material Law 36 : tabulated elasto-plastic material Law 60: 36 quadratic strain rateinterpolation Law 66: Visco Elastic Plastic PiecewiseLinear MaterialAustenitic & stainless steels Law 63: Hansel material Law 64: Ugine & ALZ materialCrushable foams (Honeycomb) Law 28: Honeycomb Law 50: Crushable foam Law 68: Cosserat mediumFoams Law 33: Closed Cell visco-elasto-plasticLaw 35: Generalized Kelvin-Voigtopen/closed cellsLaw 38: Tabulated visco-elastic materialLaw 70: Tabulated hyper visco elasticmaterial User defined material subroutinesRubber Plastic Law 42: Ogden-Mooney-RivlinLaw 62: Hyper Visco Elastic material Law 36: tabulated elasto-plastic materialLaw 65: Elastomer materialLaw 66: Visco Elastic Plastic PiecewiseLinear MaterialLaw 76: SAMP Law 27:elasto-plastic brittle materialLaw 36: tabulated elasto-plastic materialGlassComposite Law 36: tabulated elasto-plastic material Law 15: Tsai-Wu plasticity Chang & Chang failure Law 25: Tsai-Wu plasticity modelFabric Special Law 19: linear elastic orthotropic materialLaw 58: nonlinear elastic materialLaw 5: Jones Wilkins Lee Material(Explosives e.g. TNT)
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Material Law 2: simple elasto- plastic material Material LAW2 Johnson-Cookwith rupture Example of Radioss card Mild steel material#---1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7---- ----8---- ----9---- ---10---- /MAT/PLAS JOHNS/1Material A#Init. dens.Ref. dens.7.8E-90#ENu210000.3#abnEps maxsigmax400550.5.40#cEPS0IccFsmoothF CUT00000#mT meltrhoCpT i0000#---1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7---- ----8---- ----9---- ---10----
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Orthotropic non-linear laminated composite material
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Orthotropic non-linear composite material
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Example of validation for 45 deg compression#---1---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7---- ----8---- ----9---- ---10---- /MAT/COMPSH/10Altair composite material#Init. dens.Ref. 00.9999#WpmaxWprefIoff005#CEPSALPHAIcc0000#sig trac 1B 1TN 1TSIGMA 1MAXTC 1T0.125.1000#EPS 1T1EPS 2T1SIGMA RST1Wpmax trac 10000#sig trac 2B 2TN 2TSIGMA 2MAXTC 2T0.120.1000#EPS 1T2EPS 2T2SIGMA RST2Wpmax trac 20000#sig comp 1B 1CN 1CSIGMA 1MAXCC 1C.00502000.500#EPS 1C1EPS 2C1SIGMA RSC1Wpmax comp 10000#sig comp 2B 2CN 2CSIGMA 2MAXCC 2C.00502000.500#EPS 1C2EPS 2C2SIGMA RSC2Wpmax comp 20000#sig 12B 12TN 12TSIGMA 12MAXTC 12T.004083.0.3100#EPS 1T12EPS 2T12SIGMA RST12Wpmax trac 120.0750.0850.050#GAMMA INIGAMMA MAXDmax1E311E31.9999# #SIGMA1 TSIGMA2 TSIGMA3 TSIGMA1 CSIGMA2 C1.200.5251E300.7000.700#SIGMA3 CSIGMAF 12SIGMAM 12SIGMAM 23SIGMAM ---- ----2---- ----3---- ----4---- ----5---- ----6---- ----7---- ----8---- ----9---- ---10---- - Strains to damage and rest stress in direction 12 are used to reproduce the test behavior- Note that damage strains are half of the damage gamma values
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Sinus beam crash (generic composite material) Check model built up Definition of materials, properties Run settings Post processing
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS – Rupture Criteria& FLD in stress planeNXTTAB1EMCDuctile materialExtended Mohr-Coulomb MIT
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Tabulated failure criterion for elastoplastic materials Failure Curve (eps f vs. triaxiality) test –input is a user function Strain Rate Dependency – Differentcurves for different strain rates Element Length Dependency Load path is taken into account bydamage accumulation Bending Behavior: Percentage ofThickness to fail before deleting shells
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Tabulated failure criterion for elastoplastic materialsRADIOSS simulation
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Simple Chang-Chang failure criteria for composites With fiber direction 1: For matrix cracking: Tensile fiber mode:2 Tensile matrix mode2 11 12 1 11 0SS 1 12 0 deg Tension45 deg Tension Compressive fiber mode:2 Compressive matrix mode2 11 1 C1 2 22 22 0 12 1 S2 S12 90 deg Tension45 deg Tension 11 00 deg Compression222 22 C2 1 22 12 1 C2 S12 2S12 2S12 22 090 deg Compression45 deg Compression
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Failure criteria can be combined Possibility to apply several failure criteria for one material law : Example :– Hashin for fiber– Puck for Matrix– Ladeveze for delamination
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Connect material LAW59 for adhesive layersBefore crash.After crash.- For adhesive layers, spotwelds, any other type connections- Element height does no affect time step. Can be 0!- Example of DCB test with LAW59
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Ply-XFEM Approach for delamination
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS - DALLARA Race cars design Composite structures
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS - X-FEM GoalsoSplitting elements when failure occurs accuracyoCrack propagation independent of the mesh directionso mesh size independencyoAllow relatively coarse meshCapabilitiesooCompatible properties /PROP/SHELL isotropic mono-layer /PROP/SH SANDW isotropic/orthotropic multi-layerCompatible failure models /FAIL/JOHNSON /FAIL/TBUTCHER /FAIL/TAB1 /FAIL/FLD FAIL/TAB with Lode angle /FAIL/SNCONNECT /FAIL/NXToCrack visualization per layeroSimple activation through the flag Ixfem 1
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS - X-FEM update Latest enhancementsoAddition of an optional “advancement parameter” [0 , 1] in all X-FEM compatible failure models Decoupling of the crack initiation and the crack advancement criteria Enabling the control of cracks number and crack propagation velocityoSPMD & H-MPP compatibility and performance optimizationoCompatibility /MAT/HILL (LAW32) &/MAT/HILL TAB (LAW43) with /FAIL/JOHNSON criterionWith XFEMFailure Criteria (FLD)0.0020.002Failureapplied curveZoneWithout XFEM0.0006e minor
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Agenda1. What is Radioss Explicit Solver2. Material Laws and Rupture Criteria3. Fluid Structure interaction4. Multi-Domain5. Scalability / Repeatability6. Advanced Mass Scaling7. Example: drop test on a composite glass plate
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS FSI: SPH and ALE Smooth Particle Hydrodynamicis used :1. the fluid fills only a small portionof the domain2. Air behavior can be neglected (nocavitation ) Arbitrary Lagranginan Eulerianis recommended:1. the fluid fills most of the domain2. Air behavior cannot be neglected(no cavitation )3. Accurate fluid modeling(turbulence ) required
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Landing run over a wavy water surfaceSimulaton: 180kmh run along 80m water basin
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Smooth Particles Hydrodynamics for ditching problems Domain divided by a set of particles tied to their neighbors by internal forces Incompressible water material is used Appr 3.300.000 particles93000mm
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.SPH for Multidomain in RadiossStructural domain: deformable structure of aircraft 300.000 elements Maximal possible time step 0.25e-02msWater domain: SPH and void component to replicate fuselage type 7 contact between the void and SPH water Maximal time step 3.300.000 elements, maximal time step 0.17e-01ms
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.180kmh. Von Mises Stress distribution in structureDue to multidomain approach simulation time reduced from 10 to 2 weeks
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Comparison to measurements. Moments over one period of waveBlue: landing test measurementsLila: Radioss simulations
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Agenda1. What is Radioss Explicit Solver2. Material Laws and Rupture Criteria3. Fluid Structure interaction4. Multi-Domain5. Scalability / Repeatability6. Advanced Mass Scaling7. Example: drop test on a composite glass plate
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS - Multi-Domain Each domain is computed as a distinct model using its own time step staying on sync bya master RADIOSS process Force and momentum between domains are transferred by the master RADIOSS processinsuring equilibrium and stability at sync times Only one domain is computed at a timerad2radRADIOSS 1SD1RADIOSS 2SD1SD2SD2Full domain:Front end cabinMedium mesh RADIOSS 3Sub-domain #1:Bumper RailsFine meshSub-domain #2:Truck bedCoarse meshNo limitation in term on number of domainsIn case of two domains a single input is used and RADIOSS creates automaticallythe dedicated input decks
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS – Multi-Domain NEON model – pole 1.2M element model200000Total Elapsed Time [s] vs. Number of Cores180000160000140000MONO120000R2R HMPP1000008000060000Mesh refined 10 times (1mm x 1mm)in the central part of the bumper400002000001224Speed up ratio 2.748Subdomain : 140k shellelements (12%) – dt 0.1 ms
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS – Multi-Domain Multi-Domain v. Monodomain Robustness Analysis 1 mm random noise by seed increment of 0.1 from 0.0 to 0.9Multi-Domains is a proven method delivering High quality results (same as regular single n much faster (than regular single domain)Bumper beam horizontal sectionsMulti-DomainMonodomainLeft Rail Section forcesPole Reaction ForcesMulti-DomainMonodomainRight Rail Section forces
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Agenda1. What is Radioss Explicit Solver2. Material Laws and Rupture Criteria3. Fluid Structure interaction4. Multi-Domain5. Scalability / Repeatability6. Advanced Mass Scaling7. Example: drop test on a composite glass plate
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS: Leading Scalability in crash Scalability10 Million Elements RADIOSS V13.08192 cores16 384 cores
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS – Unique solution with Full Repeatability Full model with dummy and airbag1.5 M elts Runs on 16, 32, 48 & 64 cores Accelerometer No.:8091017 (RockerLower Left) Perfect Repeatability Independent ofamount of coresCourtesy Magna SteyrCourtesy Magna Steyr
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS - Robustness and RepeatabilityNumerical scattering in RADIOSS is minimizedSingle PrecisionDouble PrecisionSingle PrecisionDouble PrecisionSingle precisionbrings 40% speedup(RADIOSS runs with 1 e-6 random noise applied to all nodes)
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Agenda1. What is Radioss Explicit Solver2. Material Laws and Rupture Criteria3. Fluid Structure interaction4. Multi-Domain5. Scalability / Repeatability6. Advanced Mass Scaling7. Example: drop test on a composite glass plate
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS speed up solution Advanced Mass Scaling Classical methods for raising time step Increase of mass & momentum change the kinematic energy All frequencies are affected AMS Non diagonal mass matrixM* M Assembling elementary matrices de large enough to obtain the target time step 3 1 1 1 d e 1 3 1 1 12 1 1 3 1 1 1 13 Added mass zero / No change in total mass, energy & momentum Low frequencies are almost not affected
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.RADIOSS – Advanced Mass ScalingAMS1.Competitive for quasi static simulation versus implicit2.Efficient for manufacturing (stamping, )3.Allows to stay with a “standard” time step with a fine meshed modelMassScalingAdvanced MassScalingTarget timestep0,5 ms10 msMean timestep0,5 ms9,9 msNb of cycles40318720146Elapsed Time(16 cores)19.6h4.2hSpeed-up4.64 x
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.AMS example : quasi-static tube crush Tube : 8 plies carbon epoxy Height : 76 mm Side length : 63 mm 18545 elements (element size 1mm)
Copyright 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.AMS : exampleNo AMS (mass is added for cste dt): : 10 hoursAMS, time step multiplied by 5: 2 hours 40 minutesAMS, time step multiplied by 10 : 2 hours 25 minutes
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Agenda1. What is Radioss Explicit Solver2. Material Laws and Rupture Criteria3. Fluid Structure interaction4. Multi-Domain5. Scalability / Repeatability6. Advanced Mass Scaling7. Example: drop test on a composite glass plate
Copyright 2013 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.Welcome to Radioss SeminarThe aim of this example is to simulate failure and crack propagation into glass compositestructureDiscussed: Definition of elasto-plastic material for the plate Finite element properties of shell Rigid wall definition Boundary conditions Simulation set up Post processing of resultsHW programs used: Hypercrash for model set up Radioss for simulation Hyperview for postprocessing of results
Thank you for your attentionInnovation Intelligence 49
Innovation Intelligence Altair Radioss Explicit Solver Dmitry Fokin
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Nama Mata Kuliah : Akuntansi Keuangan Lanjutan Kode Mata Kuliah : AKM 145001 Semester : 5 (lima) Sks/jam perminggu : 3 SKS/ 6 jam Jurusan/ Program Studi : Jurusan Akuntansi/ DIV Akuntansi Manajemen Dosen Pengampu : 1. Novi Nugrahani, SE., M.Ak., Ak 2. Drs. Bambang Budi Prayitno, M.Si., Ak 3. Marlina Magdalena, S.Pd. MSA Capaian Pembelajaran Lulusan yang dibebankan pada mata kuliah :Setelah .
