ansys structural mechanics r16 updates

2015 ANSYS, Inc. January 26, 2015 1

R16 Structural Mechanics An overview

Pierre THIEFFRY January 2015


Fabricated Structures


R16 brings to high efficiency the modeling of fabricated structures to the same level f 3D modeling

R16 offers a new highly automated process that leverages faster transfer from geometry, new meshing algorithms, parallel meshing and efficient mesh connections.

Courtesy Bardella


Typical workflow removes the need for shared topology and favors the use of imprints, resulting in faster transfer from geometry to Mechanical


Since all parts are imported separately, parallel part-by-part meshing can be used to speed-up the meshing process

The tree view can now be organized in folders to better manage long lists of parts


Shell meshing benefits improved quad meshing algorithms

Default settings, R15 algorithms

Fixed setting, new R16 algorithms


Mesh connections are automatically detected similar to contacts and are used to ensure coincident nodes at edges

Connectivity shows disjointed faces

After connections, model is properly connected


Node merge operations can also be used to join parts, including mixed topologies


Element quality can now be displayed on the mesh

Find Min or Max value

Display mesh contours

Probe element values


Move node option allows for local adaption of node location to manually improve mesh quality


Welds can be added to a surface model to connect parts

Seam welds

Skip welds


Welds and other parts are connected using mesh connections


Detach operation can be used to split surface bodies in multiple surfaces for better local control of mesh or easier geometry changes (orientations, defeaturing )

Mesh independent faces with parallel meshing


Beam Stress Contour gives full solution of the beam, including maximum/minimum stress values on the outer surface of the beam structure

Maximum Normal Stress

Minimum Normal Stress


Contact


Improve contact stiffness updates makes contact analysis more robust and faster than before

Model R15.0.7 R16 Reduction in Iterations

Electronics component Failed Sprayer Failed Piston Failed Stent Failed Bracket 162 Iterations 121 iterations 25%

Hyperelastic Hose 1252 Iterations 756 Iterations 40%

Thin walled offshore structure 952 Iterations 743 Iterations 22%

Wire bending 1002 Iterations 836 Iterations 17%

Cable Hose 377 Iterations 176 Iterations 53%

Wiper Slipstick 809 Iterations 165 Iterations 80%


General contact helps automatically identifies all possible contact, thus minimizing human errors.


Enhancements in contact surface wear modeling provides more accurate wear results and allow for automated remeshing and automated termination of the simulation

19

Max

. Con

tact

Pre

s.

Time

Crit. Stop Value

Analysis Terminates Automatically


Contact trackers can be added even after the solution has been computed


Productivity


Continuous improvements to the user interface are required to save users time

As simulations involve always larger models made of dozens, hundreds of parts, it is necessary for the user to be able to easily create, manage and and navigate through complex models.


Assemblies


Improved assembly management allows for import of more details of the model and improves data management in the simulation tree


Users can now quickly preview the orientation of the different parts, allowing you to re-position your sub-assemblies if needed.


Significant performance improvement have been made in Model Assembly agorithms for a speedup of 2-3x compared to prior releases.

Bodies Nodes Element Time(R15 / R16) Speedup

Model 1 589 2253704 993545 06:53 / 2:31 2.7

Model 2 29 481916 284770 04:30 / 0:35 7.7

Model 3 10 339787 216929 01:54 / 0:53 2.1

Model 4 648 6335506 3457549 10:52 / 3:57 2.7


Parallel contact detection speeds up model load time significantly for large assemblies

358 parts, 793 contacts found Using machine w/4 CPU Automatic contact detection time: 6 seconds with R16, 46 seconds with R15


Graphical and view tools


Object Grouping allows the user to create folders to logically group loads and coordinate systems to make the tree more manageable


New Details View Property to Control MAPDL Solver Pivot Error Checking

Also includes an Options panel setting for default on all future databases.


Graphical exploding of parts helps with selections and visualization of hidden parts

Slider Bar to Dynamically Explode

Annotations follow the Geometry


Tree Filtering has been expanded to filter based on Visible Bodies

Full Tree and All Bodies Visible

3 Bodies Visible with tree filtered based on Visible Bodies

RMB shortcuts allow for fast filtering based on visible bodies or display of bodies from filtered tree


Duplicate/Copy/Paste options for Named Selection worksheet help faster creation of complex selections

Copy sets the row that will be pasted elsewhere. This also enables the Paste Above/Below buttons.

Paste Above Paste Below

Places a clone of your copied row above the Places a clone of your copied row below the row you have right-clicked row you have right-clicked


Multiple items in the Tree can be renamed at once

When an item is selected in the tree, you can press F2 or click Rename (F2) to rename that item.

As of P3, when multiple items are selected, you can now rename these items all at once in the same way. Selecting this option will launch the batch rename dialog.

Inside, you can enter the new name that your selected items will share. You can also choose whether the items will have numbers appended sequentially to them.


Pictures are easily capture from new toolbar menu, context menu or simply Ctrl+C


Conservative Mapping


Motivation

When importing forces from an external source, it is important to accurately capture resulting forces, which is generally not the case if non-conservative algorithms are used.


External data now allows to use conservative algorithm while importing loads to better match resulting forces


CFD Conservative

Example conservative mapping

Total Deformation using Conservative matching with CFD transfers

Profile Preserving

Force Reaction Rx Ry Rz RTotal

CFD 13.904 10.082

-372.99 373.38

Profile Preserving 22.231 2.1930

-369.22 369.89

Conservative 14.375 1.4483 -368.72 369.00


Composites


Advanced Challenges in the simulation of composites products

carbon.at

americascup.com

Complex shapes, degradation of material properties due to manufacturing are adding complexity to the modeling of composites parts yet need to be captured to improve the accuracy of simulation models.


New solid model geometry cut-off lets you define arbitrary cut-outs in your structured solid composite models


Shear, Temperature, and Degradation Factor Dependant Material Data lets you model imperfections of composites

Carbon-epoxy cross-section showing voids (Prof IM Daniel, Northwestern University, USA)

Composite draping: shear and wrinkling (Dr M Sutcliffe, University of Cambridge, UK)


Degradation Field and Draping Simulation include the effect of draping shear and manufacturing artifacts on the material properties

(a) Model without imperfections showing a safe design (b) Draping effect indicates potential issue in the bottom right corner (c) Temperature effect shows critical areas in in the root and notch regions (d) Degraded material properties, the critical regions extend clearly (red areas).

(a) (b)

(c) (d)


ACP Plies imported into Mechanical provides better overview of model contents


Analysis plies can be displayed as hierarchy or flat view

Analysis Plies showing ACP Hierarchy of Modeling and Production Ply Groups

Flat List of all Analysis Plies


Display of Single Ply Information

Select a single ply in Tree

Highlight Elements in Pink Showing Fiber Direction and Element Normal Can display Transverse direction also when

enabled

Toggle Fiber Direction and Element Normal

Detailed View updates with ACP imported information of single Ply


Display of Fiber Stresses in a Ply

Ability to change Position in a Ply Pick a Ply and change CSYS

Use arrow key to navigate between ply results


Display of Stresses in a Layer

Stress in Solution CSYS of a given layer Past R16.0 and MAPDL Behavior preserved Past 16.0 databases resume only with Layers


Material Failure


Motivation

Engineers need to investigate the consequences of cracks appearing in a product from the manufacturing process or from fatigue to avoid early failure of the product possibly in an easy way.


Inclined Cracks


Created automatically by the meshing process

Is a child of the Crack object.

Cannot be modified directly or used elsewhere in the model

Used in the MAPDL input file, graphics annotations, and fracture calculations associated with a given crack.

New object Crack Coordinate System


Align with face normal: Specifies whether the Crack

Coordinate Systems X-Axis will be aligned with the face normal of the nearest surface. Defaults to Yes.

Project to nearest surface: Specifies whether the Crack

Coordinate Systems origin will be projected to a point on the nearest surface. Defaults to Yes.

New Properties on the Crack Object

Crack annotations for inclined crack

Crack mesh for inclined crack in X-Z plane


Unstructured Mesh Method (UMM)


UMM - Unstructured Mesh Method

The unstructured mesh method (UMM) is a numerical tool used to improve the accuracy of fracture mechanics parameter calculations for unstructured hexahedral meshes and tetrahedral meshes.

The accuracy of the resulting parameters is generally comparable to that of the parameters evaluated using structured hexahedral meshes.


A turbine blade geometry

2 in Radius crack, penny shape

J-Integral at Contour 3 and 4 is plotted

The results are almost indentical

Tet mesh allows the user to easily define complex crack shapes

Higher tet mesh fidelity increases accuracy of results

Comparing J-integrals, Hex vs UMM

Hex Mesh

Tet Mesh

Poor Results without UMM


A Fracture Analysis Guide is now available


Elastomers


Adaptive remeshing in Mechanical


Adaptive remeshing is now supported in Mechanical for static structural analysis

Multiple NLAD regions allow user to define different criteria simultaneously


Results are plotted over changing mesh

Initial mesh

Third remesh during solve

Second remesh during solve

First remesh during solve


Adaptive remeshing is monitored in the regular convergence chart

Additional column in tabular data window indicates when mesh is changed


Example application: connector seal

Mesh is refined where needed during the solution process


Material Force For Elastomers


Material forces are used to determine fracture mechanics parameters of rubber material

Motivation and Overview


Material forces can be seen as the driving forces acting on any kind of inhomogeneity, including crack tips. Calculations are performed similar to regular fracture parameters with a special option for material forces.


Thermal Fluid Flow


Thermal Fluid Flow analysis

Thermal Fluid Flow analysis is equivalent to a reduced-order modeling for a Computational Fluid Dynamic (CFD) analysis with a one-dimensional fluid flow.

This analysis allows to solve the models not only in full 3D environments but also for 2D-plane and 2D-axisymmetric cases.

Heat flow is generated by the conduction within the fluid and the fluid mass transport.


Thermal Fluid Flow uses line bodies with Thermal Fluid properties analysis activation

The Fluid Cross Area new property will appear to allow modifying the default Cross Section Area value downloaded from the geometry application .

The Discretization new property will allow to set the specific element shape functions algorithm for FLUID116 .


Thermal fluid sample model


Nonlinear Base Eigenvalue Buckling


Buckling loads can be computed considering nonlinearities in the model, with or without additional loads


Nonlinear Base Eigenvalue Buckling

Unlike linear buckling, load multiplier is calculated for incremental loads applied after static solution considering nonlinearity. Ultimate buckling load of the nonlinear buckling is calculated as follows:

ultimate buckling load

load applied at start point

incremental load applied in buckling given prestressed

effect resulted from

load multiplier

perturbedrestartbuckling FFF +=

bucklingF

restartF

perturbedFrestartF


Eigenvalues can be computed based on the prestress loads or with incremental loads

perturbedrestartbuckling FFF +=

restartrestartbuckling FFF +=


Rotating Machines


Motivation

Mistuning, off-balance of disks and/or shafts have a significant impact on dynamic behaviors of rotor machinery.

In order to meet standard and specifications, designers have to take these effects into account.


Unbalanced Harmonic Response of Rotordynamics is now available in Mechanical

Right bearing stretch due to unbalanced masses in disks for each frequency step


Small blade-to-blade variations due to manufacturing tolerances and wear, produce large uncertainty in the forced response levels of bladed discs. Mistuning modeling is now available in R16.

*dim,kmist,array,22,1 kmist(1,1) = 0.01,0.015,0.01,0.015 cycfreq,BLADE,interface,bladeelem,20,,, cycfreq,MIST,K,kmist

Tuned Mistuned (either for stiffness or mass)


And there is much more


check the Release Notes!


Think also of the Technology Demonstration Guide

R16 Structural MechanicsAn overviewSlide Number 2Fabricated StructuresR16 brings to high efficiency the modeling of fabricated structures to the same level f 3D modelingTypical workflow removes the need for shared topology and favors the use of imprints, resulting in faster transfer from geometry to MechanicalSince all parts are imported separately, parallel part-by-part meshing can be used to speed-up the meshing processShell meshing benefits improved quad meshing algorithmsMesh connections are automatically detected similar to contacts and are used to ensure coincident nodes at edgesNode merge operations can also be used to join parts, including mixed topologiesElement quality can now be displayed on the meshMove node option allows for local adaption of node location to manually improve mesh qualityWelds can be added to a surface model to connect partsWelds and other parts are connected using mesh connectionsDetach operation can be used to split surface bodies in multiple surfaces for better local control of mesh or easier geometry changes (orientations, defeaturing )Beam Stress Contour gives full solution of the beam, including maximum/minimum stress values on the outer surface of the beam structureContactImprove contact stiffness updates makes contact analysis more robust and faster than beforeGeneral contact helps automatically identifies all possible contact, thus minimizing human errors.Enhancements in contact surface wear modeling provides more accurate wear results and allow for automated remeshing and automated termination of the simulationContact trackers can be added even after the solution has been computedProductivityContinuous improvements to the user interface are required to save users timeAssembliesImproved assembly management allows for import of more details of the model and improves data management in the simulation treeUsers can now quickly preview the orientation of the different parts, allowing you to re-position your sub-assemblies if needed.Significant performance improvement have been made in Model Assembly agorithms for a speedup of 2-3x compared to prior releases.Parallel contact detection speeds up model load time significantly for large assembliesGraphical and view toolsObject Grouping allows the user to create folders to logically group loads and coordinate systems to make the tree more manageableNew Details View Property to Control MAPDL Solver Pivot Error CheckingGraphical exploding of parts helps with selections and visualization of hidden partsTree Filtering has been expanded to filter based on Visible BodiesDuplicate/Copy/Paste options for Named Selection worksheet help faster creation of complex selectionsMultiple items in the Tree can be renamed at once Pictures are easily capture from new toolbar menu, context menu or simply Ctrl+CConservative MappingMotivationExternal data now allows to use conservative algorithm while importing loads to better match resulting forcesExample conservative mappingCompositesAdvanced Challenges in the simulation of composites productsNew solid model geometry cut-off lets you define arbitrary cut-outs in your structured solid composite modelsShear, Temperature, and Degradation Factor Dependant Material Data lets you model imperfections of compositesDegradation Field and Draping Simulation include the effect of draping shear and manufacturing artifacts on the material propertiesACP Plies imported into Mechanical provides better overview of model contentsAnalysis plies can be displayed as hierarchy or flat viewDisplay of Single Ply Information Display of Fiber Stresses in a PlyDisplay of Stresses in a LayerMaterial FailureMotivationInclined CracksNew object Crack Coordinate SystemNew Properties on the Crack ObjectUnstructured Mesh Method (UMM)UMM - Unstructured Mesh MethodComparing J-integrals, Hex vs UMMA Fracture Analysis Guide is now availableElastomersAdaptive remeshing in MechanicalAdaptive remeshing is now supported in Mechanical for static structural analysisResults are plotted over changing meshAdaptive remeshing is monitored in the regular convergence chartExample application: connector sealMaterial Force For ElastomersMaterial forces are used to determine fracture mechanics parameters of rubber materialSlide Number 67Thermal Fluid FlowThermal Fluid Flow analysis Thermal Fluid Flow uses line bodies with Thermal Fluid properties analysis activationThermal fluid sample modelNonlinear Base Eigenvalue BucklingBuckling loads can be computed considering nonlinearities in the model, with or without additional loadsNonlinear Base Eigenvalue BucklingEigenvalues can be computed based on the prestress loads or with incremental loadsRotating MachinesMotivationUnbalanced Harmonic Response of Rotordynamics is now available in MechanicalSmall blade-to-blade variations due to manufacturing tolerances and wear, produce large uncertainty in the forced response levels of bladed discs. Mistuning modeling is now available in R16.And there is much morecheck the Release Notes!Think also of the Technology Demonstration Guide

ansys structural mechanics r16 updates

Documents