Überblick Von NX Nastran Multistep Nonlinear Solutions 401 Und 402

Überblick von NX Nastran MultistepNonlinear Solutions 401 und 402Martin.Kuessner@siemens.comGlobal Simcenter Portfolio DevelopmentLinz, 5.10.2018Unrestricted Siemens AG 2018Realize innovation.

Simulation impacts design with Simcenter 3D: SmartphoneA smartphonecombines all of thecapabilities of everyproduct shown on thefront page of that RadioShack ad from 1991 inone single product. An smartphone explains the concepts ofinnovation, complexity, risk and intersections.Unrestricted Siemens AG 2018Page 22018-10-05Siemens PLM Software

Innovation happens at lSystemEnv. ControlSystemEngineElectricalSystemManage complexity to drive Innovation and contain risksUnrestricted Siemens AG 2018Page 32018-10-05Siemens PLM Software

Issues faced by simulation departments and how to fix thoseDisparate tools andinefficient workflowsUnrestricted Siemens AG 2018Page 4Results out-of-synchwith designLimited visibility andbusiness impactBudget and resourceconstraints2018-10-05Siemens PLM Software

Issues faced by simulation departments and how to fix thoseIntegratedDisparate tools andenvironment icted Siemens AG 2018Page 5Timelyinsight sVisiblevisibilityto and andLimitedusedby ntsBudgetresourceto s PLM Software

Simcenter 3DPart of the Simcenter portfolio for Predictive Engineering AnalyticsUnrestricted Siemens AG 2018Page 62018-10-05Siemens PLM Software

Evolution of the NX Nastran Nonlinear Solutions“The Twins”Shared technologies : Element formulations Material library Numerical StrategySimcenter 3DStructuralNX NastranMultistep NonlinearCapability Speed UsabilityThe Twins :Sol 401 / Sol402Unrestricted Siemens AG 2018Page 72018-10-05Siemens PLM Software

NX Nastran Multistep NonlinearNX NastranMultistepNonlinearSOL 401 New solution based on Nastran architecture Initial targeted for aero-engine applications Expanding into general purpose nonlinearSOL 402 New solution based on Samcef solver Samcef is well known among Europeanaerospace companies Embedded in NX Nastran paradigm toprovide easy access to PL usersOneLicenseTwoSolutionsUnrestricted Siemens AG 2018Page 8Easytransitionfrom linearto emens PLM Software

NX Nastran Multi-step NonlinearSol401Multi-Step Nonlinear Based on traditional Nastranarchitecture Multiphysics couplingCommonalities Mutli-steps solution Use many of the sameformulation and give nearly thesame results Use the same Nastran input foreasy conversion to one solutionto the otherSol402Multi-Step Nonlinear Kinematics Based on deep integration ofSamcef in Nastran Nonlinear mechanism Large strain Advanced Contact Modeling Large displacement Shared Material Modelsincluded nonlinear materialsUnrestricted Siemens AG 2018Page 92018-10-05Siemens PLM Software

Simcenter Nonlinear FE solversFamily treeNXN MultistepSOL 401SOL 402Samcef( environment)( environment)( environment)Nastran modeling language (BDF)Nastran modeling language (BDF)NX Nastransolver Unrestricted Siemens AG 2018Page 10SamcefSamcef modeling language (DAT)SamcefsolverMaterial LibraryElement FormulationsMatrix SolversMemory AllocationOutput FormatsNumerical Strategies2018-10-05Siemens PLM Software

Simcenter 3D – Solver environmentUnique architecture supports custom environmentfor each solver User interface is tailored for each type of physics being solved Solver-specific terminology used for pre/postUnrestricted Siemens AG 2018Page 112018-10-05Siemens PLM Software

Direct Matrix Abstraction Program (DMAP) in NX NastranNX Nastran Direct Matrix Abstraction Program (DMAP) is a high-level language with its owncompiler and grammatical rules. A DMAP program consists of a series of functional blocks called “modules,” each of which has aunique name and a specific function. Modules are executed sequentially; branching and loopingoperations are performed by DMAP control statements. Modules communicate through the NX Nastran Executive System (NES) via logical collections of data called “data blocks” and“parameters.” Data blocks come in two distinct forms: “matrices” that obey the rules of matrix algebra, and“tables” that represent a convenient collection of data items.Unrestricted Siemens AG 2018Page 122018-10-05Siemens PLM Software

NX Nastran SOL402Simcenter environmentSOL402 is available as an NX Nastransolution in structural analysis type, andbenefits from following capabilities: Import of Nastran decksMesh definition in the FEM fileBoundary conditions in the SIM fileSolver syntax previewExport and solveHPC : DMP and SMPSolver monitor with abort and stopPost-processing Multiple graphs and MONVARin SC12.0.1TimeUnrestricted Siemens AG 2018Page 132018-10-05EndsubcaseTimestepsizeConvergence criterionSiemens PLM Software

Nonlinear materialsHyperelastic Materials (SOL 402)Typical Elastomeric Material Characteristics Nonlinear-elastic load extension behavior. Can be subject to large elastic strains (up to 600%) Nearly incompressible Temperature dependent propertiesImplementation Large displacement and large strain Models Generalized Mooney-Rivlin model Mullins effect with Ogden model Viscoelastic effect with Holzapfel Hyperfoam modelUnrestricted Siemens AG 2018Page 14Stress σLoadingStrain energydensity WStretch λ2018-10-05Sol 402Siemens PLM Software

Nonlinear materialsViscoelastic MaterialsViscoelastic materials : Elasticity (like a rubber that stretches instantaneously and quickly returns to itsoriginal state once a load is removed Viscous behavior (like the gradual deformation)Implementations : Kelvin (Sol402 & Sol401) Prony series (402)Unrestricted Siemens AG 2018Page 152018-10-05Sol 402Siemens PLM Software

Nonlinear materialsCreepCreep (or cold flow) Permanent deformation after a long term exposure to high levels of stress Important for long period of exposure to hetCreep Implementation : Baily Norton model (isotropic creep with optional temperature dependency) Dedicated time step managementValidated by several industrial casesUnrestricted Siemens AG 2018Page 162018-10-05Siemens PLM Software

Nonlinear materialsProgressive damage of composite material (Sol402)Several native models available for : Interlaminar damage or Interlaminar damageIntralaminar damage : For Unidirectional or Woven ply Different type of damage : Fiber damage Matrix Damage Decohesion between matrix et fiberAccurate Progressive Damage PredictionDecohesionfibre/matrixMatrix crackingFiber breakingDelaminationInterlaminar damage : Using cohesive element (managed by SC3D) Several behaviorValidated by several industrial casesUnrestricted Siemens AG 2018Page 172018-10-05Siemens PLM Software

User material (MUMAT)or Custom Material LawUser (MUMAT) : Material model user-subroutineDescription Allow users to link proprietary material models NX Nastran Rate dependent or rate independentImplementation Users link Fortran code of material models to NX Nastranvia a DLL Supports rate dependent and rate independent materials Allows output of state variablesValue Users can develop and use proprietary material models User can also set up this material from SC3D environmentUnrestricted Siemens AG 2018Page 182018-10-05Siemens PLM Software

NX Nastran SOL40xContact modelingCapture the real behavior of your structure with contact between parts: Several contact algorithm and options Support all the possible nonlinearities (material & geometric) Update of the contact condition during the run (large displacement) Explicit definition of the contact for Node to FaceUnrestricted Siemens AG 2018Page 192018-10-05Siemens PLM Software

NX Nastran SOL40xAdvanced Sliding Contacts Friction Constant, infinite, function of temperature, velocity or time Large sliding Gap and offset control Ignore, eliminate, override initial distance Flexible or Rigid targets Geometry smoothing option Activation/deactivation of contact condition Stabilization options Outputs Contact pressures Contact forces Normal distance SlidingUnrestricted Siemens AG 2018Page 202018-10-05Siemens PLM Software

Transient Simulation (SOL 402)Features Multiple time-step integration models Automatic time stepping Static, kinematic, and transient analysisResponse typeEquation solvedStaticKT.q FDynamicwithout inertiaC.q KT.q FDynamicM.q C.q KT.q F0410201630TimeSubcase #1:Static analysisSubcase #2:Static analysisSubcase #3:Dynamic analysisDisplacementGravityGravity0101Damping model Rayleigh Material482012.5163024TimeConvergedtimesTime incrementfor back-upImposedtime valueImposedtime stepSavedtimesUnrestricted Siemens AG 2018Page 212018-10-05Sol 402Siemens PLM Software

Post-Buckling Analysis (SOL401)Description Arc length method allows analysis of post-buckling andsnap through types of problems Nonlinear Statics step with zero delta time Incremental loads defined in the step are proportional Loads applied in prior steps are held constant An initial imperfection/mesh perturbation can beappliedLimit pointlSnap throughValue Finds possible buckled states that are below theperceived buckling load. Imperfections in geometry can reduce buckling loads –important to include the effectUnrestricted Siemens AG 2018Page 222018-10-05Riks methodlStableStableUnstableDisp.Sol 401Siemens PLM Software

Thermal-Mechanical Solutions(SOL401)NX Nastran couples to Simcenter Thermal Cosimulation solution API’s developed for both solvers MP Driver will sequence each solution and transferdata Coupling behavior Contact changes heat and load paths Heat transfer changes with gap distances Levels of Coupling Sequential coupled – At each coupling step, statefrom previous step is used Iterative coupled – At each coupling step, statefrom previous step is used as starting point ofiterations to convergenceUnrestricted Siemens AG 2018Page 23Simcenter 3D2018-10-05Siemens PLM Software

Simcenter 3D – Solver environmentValid also for Composites materialCentralized pre/postto efficiently build models for your solver of choiceNX NastranLMS SamcefLayup definitionUnrestricted Siemens AG 2018Page 24Mesh definition2018-10-05Siemens PLM Software

Exchange data to accelerate the design processConvergent MorphModeling data in CAEAssociativity CAD/CAESimcenter AEmodelsUnrestricted Siemens AG 2018Page 25CAEResults22018-10-05Siemens PLM Software

ConclusionHow are Simcenter 3D nonlinear solutions customers benefitting?Assessment of continuousimprovement to supportnew virtual designworkflowFlexible licensingtrough SimcenterTokensCumulated Siemensexperience of 70 yearsfor reachingQualityBetter designs,faster!Unrestricted Siemens AG 2018Page 26Up to20%-40%time savings for completevirtual productdevelopment workflowwith Simcenter 3DEngineering Desktop2018-10-05Siemens PLM Software

Überblick von NX Nastran MultistepNonlinear Solutions 401 und 402Martin.Kuessner@siemens.comGlobal Simcenter Portfolio DevelopmentLinz, 5.10.2018Unrestricted Siemens AG 2018Realize innovation.

Nonlinear materials Hyperelastic Materials (SOL 402) Typical Elastomeric Material Characteristics Nonlinear-elastic load extension behavior. Can be subject to large elastic strains (up to 600%) Nearly incompressible Temperature dependent properties Implementation Large displacement and large strain Models Generalized Mooney .