May 2015 Workbench V16 Update - Epsilon FEA, LLC

within EpsilonTwin CitiesANSYS User MeetingMay 2015Workbench v16 Update within Epsilon

within Epsilon1.2.3.4.5.6.AgendaUsability EnhancementsAdaptive MeshingWeld ConnectionsSpaceclaimMaterial Modeling ImprovementsV15 remindersANSYS User Meeting2

within EpsilonMoore’s LawSimulation is increasingly underutilized!ANSYS User Meeting3

Analyst vs Advocate within EpsilonGet rk ateScopeProjectsDirect theAnalysisANSYS User Meeting4

within EpsilonSo what’s the ce40 hoursImpact onProfitsImpactMultipliesWith more projects, whose expertise can you leverage?ANSYS User Meeting5

within EpsilonUse Epsilon as a Resource!Design Initial Analysis ParametricStudiesPrototypeSustainANSYS User Meeting Redesign Failure Modes DesignImprovements Reduce Costs6

within EpsilonWhat’s the Next Step? Let’s get an NDA in place– Just a phone call away Discover Opportunities for Simulation– Epsilon has a proven approach Become a Champion of FEA– Promote FEA as a necessityANSYS User Meeting7

within EpsilonUsability EnhancementsANSYS User Meeting8

within EpsilonFolders Parts, connections, boundary conditions, etc.can be organized into groups Easily suppress whole groups withouthunting for each itemANSYS User Meeting9

within EpsilonNode/Element Numbers Display Node/Element numbers through“Annotation Preferences” Show specific range of node/elements on the modelif needed.ANSYS User Meeting10

within EpsilonSub-Assemblies Improved assembly management– Can import more details from sub-models– Improved detail management from folders– “Preview Assembled Geometry” availableFrom ANSYS V16 Release NotesFrom ANSYS Release NotesANSYS User Meeting11

within EpsilonFace Now you can split faces using planes and surfaces!ANSYS User Meeting12

within EpsilonDetach and Body RepairANSYS User Meeting13

within EpsilonVector Plotting controls Vector Plotting allows suppression of principalsANSYS User Meeting14

within EpsilonAnalysis Options Tabular participation factor data for modal analyses Results Option: set default for calculating timehistory Can now plot stresses and strains for line bodiesANSYS User Meeting15

within EpsilonMisc. Explode!From ANSYS Release NotesANSYS User Meeting16

within EpsilonMisc. Can open Mechanical in read-onlymode (avoids tying up license) Filter Tree Based on Visible Bodies Selection Information tells youdistance between selected itemsFrom ANSYS V16 Release NotesANSYS User Meeting17

within EpsilonMisc. Thermal Fluid Line Bodies: Import pipe volumes as linebodies to model thermal fluid flowImage courtesy of PADTANSYS User Meeting18

within EpsilonMisc. Buckling: Now includes nonlinear effects, renamedEigenvalue Buckling– Incremental loads may now be added after static pre-stress– Joints now supported in linear bucklingFrom ANSYS Release NotesANSYS User Meeting19

within EpsilonMisc. Distributed Mass– Paint bodies, or surfaces with specified mass Element Orientation—Use surface/edge guides– Can adjust normals within Mechanical – but operates on entire body Joint Element Control – define elements used in joints– Contact or MPC184’s Solver Pivot Checking – continue solving whenunderconstraint detected– V15 became more sensitive to pivot errors– V16 let’s us better ignore these errors– See PIVCHECK MAPDL command)ANSYS User Meeting20

within EpsilonMisc. IGES Import Instancing– Can reuse meshing for instanced bodies, for example DM – Upgrade Feature Version– Can choose whether to update legacy .agdb’s DM – sort parts alphabetically Geometry attachment up to 2x faster Multi-threaded (parallel CPU) contact detectionANSYS User Meeting21

Meshing within EpsilonANSYS User Meeting22

within EpsilonMesh Connections ANSYS inc. continuestrend avoiding sharedtopology. This trend exists fromWB inception. Also note Spaceclaimalongside DM info.ANSYS User MeetingFrom ANSYS Release Notes23

within EpsilonMesh Connections Connect parts/bodies in ANSYS by selecting the commonpoint/edge/face between the two. Allows for greater control of what is/isn’t connected Connections can be “automated” similar to contacts Large number of connections fail in our test casesANSYS User Meeting24

within EpsilonNode Merging Connect nodes between parts/bodies in ANSYS by selectingthe common points/edges/faces.– Like NUMMRG command in MAPDL Allows for tolerance control between present nodeconnections within the modelANSYS User Meeting25

within EpsilonWhat’s the Difference?!? Mesh Connection: Node Merge:– Node merges will merge anynodes that are within the settolerance. Small tolerancesmerge nodes on top of eachother—large tolerancesforces nodes to merge over alarger area.– Mesh connection will movethe nodes of the slavegeometry to match themaster geometry. Bothbodies will share commonnodes between the two.Tolerance: 1e-5, Nodes Merged: 2ANSYS User MeetingTolerance: .25, Nodes Merged: 2526

within EpsilonNode MovingANSYS User Meeting27

within EpsilonDisplay Element Quality Display the mesh quality under “Mesh Details” Quick and easy way to look at the effects of meshconnection/node merging/node moving Uses combination of previous elementquality viewing optionsANSYS User Meeting28

within EpsilonAdaptive Remeshing New feature for nonlinear, large deflectionanalyses: “Nonlinear Adaptive Region” Intended to ressolve convergence issues with highdeformation load cases, esp. elastomers Extending trend from earlier “rezoning”– previously only in MAPDL Still has lots of caveats– Commercial application is still narrow/costlyANSYS User Meeting29

within EpsilonAdaptive Meshing Implement during Solution options– Define subset of timesteps to check: less computationtime– Multiple criteria options: skewness, strain energy,bounding box– Only remeshes when criteria is met and only in problemareasANSYS User Meeting30

within EpsilonAdaptive Mesh: Limitations Must use linear tetrahedral elements for 3D bodies– SOLID285’s Scope to solid bodies or elements only – no shellsAltered mesh cannot be shared between linked analysesNo explicit indication where a remesh has occurredMay introduce solution chatter that would otherwise not bepresentANSYS User Meeting31

within EpsilonAdaptive Mesh: LimitationsCannot be used in combination with the followingfeatures/conditions on the same part: Cyclic SymmetryContact Formulations: Normal Lagrange (3D), MPC, and BeamContact Behaviors: Auto AsymmetricPoint Mass, Beam Connection, Joints, Spring, and BearingRemote Force, Remote Displacement, Moment, Thermal Condition, andRemote Point Spatially varying boundary conditions Coupling Constraint EquationFrom ANSYS V16 Release NotesANSYS User Meeting32

within EpsilonAdaptive Meshing: ProcedureFor 3D bodies, you must set the mesh tolinear tetrahedral: Insert- Method- Definition- Method- TetrahedronsInsert- Method- Definition- Method- Element MidsideNodes- “Dropped”Large Deflection must be turned on: Analysis Settings- Solver Controls- Large Deflection- OnStore Results At All Time Points: Analysis Settings- Output Controls- Store Results At- AllTime PointsIt may also be helpful to define moreloading substeps to check at more pointsbefore the elements distort too farANSYS User Meeting33

within EpsilonAdaptive Meshing: Procedure With environment selected inthe tree, insert NonlinearAdaptive Region or select itfrom the Conditions toolbar Can only be scoped to a bodyor named selection ofelements Select criterion and timerange to check uponANSYS User Meeting34

within EpsilonAdaptive Meshing: ResultsCheck force/displacement convergence graphs ortabular data to find which time step/substep a remeshwas appliedANSYS User Meeting35

within EpsilonAdaptive Meshing: ResultsCompare pre-mesh change and post-mesh changesubsteps to find regions of improvementANSYS User Meeting36

within EpsilonMeshing misc. Fixed Size Function For Sheets – set all surface bodies tosame mesh density Face Meshing can be done without mapping– fewerelements in noncritical bodies attached to critical ones Tetra/Pyramid Free Mesh Type – give bodies a pyramidalsurface, tetrahedral core mesh Vertex alignment options available in MultiZone meshing –previously only in face meshing Inflation allowed for 2D mapped surfaces Can now sweep across multiple parts or named selections,and define sweep element size with numerical argument oredge referenceANSYS User Meeting37

within EpsilonWeld ConnectionsANSYS User Meeting38

within EpsilonWeld Connections ANSYS has started to implement welds in DM Two types of weld: Continuous and Skip (beta feature) Project- Surface ExtensionANSYS User Meeting39

within EpsilonWeld ConnectionsANSYS User Meeting40

within EpsilonWeld Connections Limitations– Only works on perpendicular surfaces– Only works in DM– Watch out for partial welds (see picture below)ANSYS User Meeting41

Contacts misc within Epsilon Contact smoothing for more accuratecircular/cylindrical/spherical contact regions – contact ismapped based on geometry, not mesh Element orientation (bodies only) Bolt tool probes results for all pretensions Contact results report far contact fields as undefined ratherthan zeroV15ANSYS User MeetingV1642

within EpsilonSpaceclaimANSYS User Meeting43

within Epsilon SpaceclaimCommunity usage?Can now read DM filesYes—you do need a separate license to run itUser friendly, terrific user experience after learningSimilar to Solidworks in feelNo design tree! Able to make changes without corrupting the rest of themodel!ANSYS User Meeting44

within EpsilonMaterial Modeling ImprovementsANSYS User Meeting45

within EpsilonComposites Better tree structure Imperfection modeling More individual ply control– Fiber direction– Ply stressesANSYS User MeetingFrom ANSYS V16 Release Notes46

within EpsilonInclined Crack Modeling Crack coordinate system created for each crack More crack definition features to work with newcrack coordinate systemFrom ANSYS V16 Release NotesANSYS User MeetingFrom ANSYS V16 Release Notes47

within EpsilonV15 - RemindersANSYS User Meeting48

within EpsilonPreprocessing Promote a scoping to a named selection!– Consider making named selections the norm /best practice– For those who don't plan well. New mapping processor– Can map stress/strain data from text file onto nodes– UV mapping algorithm (surfaces don't have to be coincident) Projects data onto surface Eases mapping from deformed to unreformed shapes!ANSYS User Meeting49

within EpsilonMeshing Local Min-Size meshing– Overrides min-size in advance meshing (proximity and/or curvature) Mesh failures are color coded / highlighted by white axesImages from help manualANSYS User Meeting50

within EpsilonSolver Improvements GPU added to solve process settings / GUI– Can have 1 GPU on SMP using Sparse now New Arc-length methodology– Now based on “Crisfield“ theory– Less likely to retrace own steps backward– Supposed to do better with plasticity NROPT,UNSYM exposed in WB– Can aid help with non-convergence/unstable problems– More expensive computationally (30% on solve time?)– Can use the WB/Mechanical generated springs Sparse has better (um, different) detection/handling ofsingular matrices.– PIVCHECK command can be disabled.ANSYS User Meeting51

within EpsilonContact Debonding Contact Debonding!– CZM technology– Uses CONT17X– Define material model Interface Delamination– uses INT20X elements– more complex separationfunctionsANSYS User Meeting52

within EpsilonMore Contact MAPDL Contact -- user-programmable definitions– Stiffness based on frequency, nonlinear, etc. FTOLN now affects FKN! Contact surface wearing– “Archard” wear model (or user defined subroutine)– Moves contact node by depth of calculated wear Controlled via material property, TB, WEAR– Total wear stored in NMISC dataANSYS User Meeting53

within EpsilonContact Bolt thread modeling– Need to have a refined mesh– Specify bolt axis/CS– Enter Pitch, Thread Angle, Diameter, etc.Image from help manualANSYS User Meeting54