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© 2011 ANSYS, Inc. August 25, 20111
Improving Your Structural Mechanics Simulations with Release 14.0
© 2011 ANSYS, Inc. August 25, 20112
What will Release 14.0 bring you?
© 2011 ANSYS, Inc. August 25, 20113
Let’s now take a closer look at some topics
© 2011 ANSYS, Inc. August 25, 20114
MAPDL/WB Integration
Finite Element Information Access within ANSYS Mechanical
© 2011 ANSYS, Inc. August 25, 20115
ANSYS Workbench is originally a geometry based tool. Many users however also need to control and access the finite element information.
Motivation
© 2011 ANSYS, Inc. August 25, 20116
Nodes can be grouped into named selectionsbased on selection logic, using locations or other characteristics – or manual selections
Selections of Nodes
Box Selection Node Picking Lasso Selection
© 2011 ANSYS, Inc. August 25, 20117
Applying Loads and Orientations to Nodes
“Nodal orientation” allows users to orient nodes in an arbitrary coordinate system.
Direct FE loads and boundary conditions can be applied to selections of nodes.
Nodes oriented in cylindrical system
Nodal coordinate system used for solution
© 2011 ANSYS, Inc. August 25, 20118
Results on Node Selections
Results are displayed on elements for which all nodes are selected.
Nodes named selections allow to scope on specific regions of the mesh or remove undesired areas.
Results with first layer of quads removed
Results on quads layers only
© 2011 ANSYS, Inc. August 25, 20119
Restart and Direct FE Loads
Nodal Forces and Pressures objects can be added to a restart analysis without causing the restart points to become invalid.
Other loads can now be modified without losing the restart points.
Analysis Settings tabular data: No restart point is lost
Added after initial solve
Second Load step modified for restart
© 2011 ANSYS, Inc. August 25, 201110
MAPDL/WB Integration
Linear Dynamics in ANSYS Mechanical
© 2011 ANSYS, Inc. August 25, 201111
Workbench and Mechanical enhancements
→MSUP Transient Analysis supported
→Joint feature can now be used in Harmonics, Random vibration analysis
→Reaction Force & Moment results is now supported
Modal Superposition Transient
Joints in HarmonicAnalyses
Reaction Forces in a Harmonic Analyses
© 2011 ANSYS, Inc. August 25, 201112
Physics Coupling
Data Mapping
© 2011 ANSYS, Inc. August 25, 201113
Motivation
Exchange files are frequently used to transfer quantities from one simulation to another.
Efficient mapping of point cloud data is required to account for misalignment, non matching units or scaling issues.
New at R14.0
© 2011 ANSYS, Inc. August 25, 201114
Increased Accuracy
The smoothness of the mapped data depends on the density of the point cloud.
Several weighting options are available to accommodate various data quality.
Triangulation versus Kriging
© 2011 ANSYS, Inc. August 25, 201115
Validating the Mapped Data
Visual tools have been implemented to control how well the data has been mapped onto the target structure
© 2011 ANSYS, Inc. August 25, 201116
Rotating Machines
Studying Rotordynamics in ANSYS Mechanical
© 2011 ANSYS, Inc. August 25, 201117
Motivation
ANSYS Mechanical users need to be able to quickly create shaft geometriesas well as analyze dynamic characteristics of rotating systems
Industrial fan (Venti Oelde)
© 2011 ANSYS, Inc. August 25, 201118
Geometry Creation
Geometries can be imported from a CAD system or imported from a simple text file definition as used in preliminary design
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Import/Export of Bearing Characteristics
ANSYS provides an interface that allows to import bearing characteristics from an external file
© 2011 ANSYS, Inc. August 25, 201120
Specific Solver Settings
Rotordynamicsanalyses require a number of advanced controls:
→Damping
→Solver choice
→Coriolis effect
© 2011 ANSYS, Inc. August 25, 201121
Campbell Diagrams
Campbell diagrams are used to identify critical speeds of a rotating shaft for a given range of shaft velocities
© 2011 ANSYS, Inc. August 25, 201122
Composites
Enhanced Analysis Workflow and Advanced Failure Models for Composites
© 2011 ANSYS, Inc. August 25, 201123
Motivation
Efficient workflows and in-depth analysis tools are required to model and understand complex composites structures
© 2011 ANSYS, Inc. August 25, 201124
Defining Material Properties
Composites material require specific definitions including orthotropic properties, as well as some constants for failure criteria (Tsai-Wu, Puck, LaRc03/04)
© 2011 ANSYS, Inc. August 25, 201125
Manually Defining Layers on Simple Geometries
Users can define simple layered sections for a shell body as well as define thicknesses and angles as parameters
© 2011 ANSYS, Inc. August 25, 201126
Defining Layers on Complex Geometries
For complex geometries, the ANSYS Composite PrepPosttool is used and layer definitions are imported in the assembly model in ANSYS Mechanical.
Courtesy of TU Chemnitz and GHOST Bikes GmbH
© 2011 ANSYS, Inc. August 25, 201127
Investigating Composites Results
ANSYS Mechanicalsupports layerwisedisplay of results.
ANSYS Composite PrepPost offers comprehensive capabilities for global and plywise failure analysis.
© 2011 ANSYS, Inc. August 25, 201128
Advanced Failure Analysis
Crack growth simulation based on VCCT is available to simulate interfacial delamination.
Progressive damage is suitable for determining the ultimate strength of the composite (last-ply failure analysis)
2D laminar composite
Initial crack
Start of damage (layer 1)
Progressed damage (layer 1)
Progressed damage (layer 3)
© 2011 ANSYS, Inc. August 25, 201129
Customization
ANSYS Design Assessment
© 2011 ANSYS, Inc. August 25, 201130
Motivation
Many of you have expressed the need for:→Computing and displaying specific results→Be able to achieve more complex “User defined results”
© 2011 ANSYS, Inc. August 25, 201131
Expanded Result Access
Filtering of potentially invalid combinations can be suppressed to enable greater user control. This allows the user to access results not typically available in the base analysis.
Modal=No Beam Results
DA + “Allow all Available Results” allows beam results
© 2011 ANSYS, Inc. August 25, 201132
Design Assessment for Advanced “User Defined Results”
Design Assessment enable users to extend user defined results capabilities with:
→Expressions, including mathematical operators
→Coordinate systems, Units Systems
→Integration options
→Nodal, Element-Nodal & Elemental result types
© 2011 ANSYS, Inc. August 25, 201133
Thin Structures
Mesh Connections
© 2011 ANSYS, Inc. August 25, 201134
Motivation
In order to connect meshes of different surface parts so as to merge nodes at intersections, users do not always want or cannot merge the topologies at the geometry level. Mesh based connections are required.
© 2011 ANSYS, Inc. August 25, 201135
Mesh Connections
Mesh connections work at part level:
→As a post mesh operation
→Base part mesh is stored to allow for quick changes in connections
© 2011 ANSYS, Inc. August 25, 201136
Modal Analyses Shows Proper Connections of the Various Bodies
© 2011 ANSYS, Inc. August 25, 201137
Further Meshing Enhancements
© 2011 ANSYS, Inc. August 25, 201138
Virtual Topologies Interactive Editing
Virtual topologies are handled more interactively through direct graphics interaction rather than tree objects.
User selects entities then applies VT operations
Direct access to operations from RMB menu
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VT Hard Vertex, Edge and Face Splits
Hard vertices can be added at any location on an edge or a face.
Hard vertices can then be used to create face splits from virtual edges.
© 2011 ANSYS, Inc. August 25, 201140
Virtual Topologies Applications
Get swept mesh on non-sweepablebodies
Improve shell mesh quality and orthogonality with VT combinations
© 2011 ANSYS, Inc. August 25, 201141
Contact Analysis
Rigid Body Dynamics
© 2011 ANSYS, Inc. August 25, 201142
Motivation
Many mechanisms and assemblies have components that operate through contact.
In order to maintain the rapid turnaround for RBD simulations, there has been a subsequent focus on improving speed, accuracy and reliability of the contact capability.
© 2011 ANSYS, Inc. August 25, 201143
Performance Improvements
Valve: 158 sec elapsed time (2x speed up)
Piston: 9 sec elapsed time (7.5x speed up)
The applicability, robustness and efficiency of the contact has been improved for speed and accuracy –expect a typical 2-5x speed-up
Transition and “jump” prediction have been greatly improved
© 2011 ANSYS, Inc. August 25, 201144
Contact Analysis
Flexible bodies
© 2011 ANSYS, Inc. August 25, 201145
Motivation
While already providing leading edge technology, ANSYS continues to enhance its ability to robustly and efficiently solve complex contact problems
© 2011 ANSYS, Inc. August 25, 201146
Projected Contact
Improved pressure results with surface projection
The Surface Projection Based Contact provides more accurate results (stresses, pressures, temperatures) and is now also available for bonded MPC contacts
Regular contact Projection based
Smoother temperature results on a multilayered structure
© 2011 ANSYS, Inc. August 25, 201147
Contact accuracy and robustness
Contact stabilization technique dampens relative motions between the contact and target surfaces for open contactNew contact
stabilization prevents rigid motion
“Adjust to touch” causes rigid body motion and leaves a gap
© 2011 ANSYS, Inc. August 25, 201148
Performance
Further benefits from GPU boards
© 2011 ANSYS, Inc. August 25, 201149
Taking advantage of the latest hardware is mandatory to solve your large models.
A combination of relatively new technologies provides a breakthrough means to reduce the time to solution
Motivation
+
© 2011 ANSYS, Inc. August 25, 201150
Distributed ANSYS Supports GPUs
2.1 MDOF, Nonlinear Structural Analysis using the Distributed Sparse Solver
GPU Acceleration can now be used with Distributed ANSYS to combine the speed of GPU technology and the power of distributed ANSYS
© 2011 ANSYS, Inc. August 25, 201151
Speed-up from a single GPU board
Solder Joint Benchmark -4M DOF, Creep Strain Analysis
Results Courtesy of MicroConsult Engineering, GmbH
Linux cluster : Each node contains 12 Intel Xeon 5600-series cores, 96 GB RAM, NVIDIA Tesla M2070, InfiniBand
Mold
PCB
Solder balls
© 2011 ANSYS, Inc. August 25, 201152
Speed-up from multiple GPU boards
Mold
PCB
Solder balls
Linux cluster : Each node contains 12 Intel Xeon 5600-series cores, 96 GB RAM, NVIDIA Tesla M2070, InfiniBand
Results Courtesy of MicroConsult Engineering, GmbH
© 2011 ANSYS, Inc. August 25, 201153
Advanced Modeling
Material Models
© 2011 ANSYS, Inc. August 25, 201154
Motivation
ANSYS provides a comprehensive library of advanced materials.
Some users however need even more advanced models to include complex nonlinear phenomena in their simulations.
© 2011 ANSYS, Inc. August 25, 201155
→Anisotropic Hyperelasticity plusViscoelasticity for strain rate effects
→Hyperelasticity coupled with Pore Pressure element
→Shape Memory Alloy enhanced with superelasticity, Memory effect, New Yield Function, Differentiated Moduli (Austenite, Martensite)
→Holzapfel Model - Capture the behavior of fiber-reinforced tissue
Advanced Materials for Biomechanical Applications
‘Hydrocephalus’ analysis Hyperelastic material with porous media
Stent modeling using shape memory alloys
© 2011 ANSYS, Inc. August 25, 201156
Plastic heat generation for coupled problems
Coupled field-elements for strongly coupled thermo-mechanical analysis now accounts for plasticity induced heat generation along with friction effects
Friction Stir Welding including heat generation due to friction and plastic deformation
© 2011 ANSYS, Inc. August 25, 201157
Advanced Modeling
Advanced Methods
© 2011 ANSYS, Inc. August 25, 201158
Motivation
The solver techniques available from our solutions allow to model complex phenomena.
In some cases, better or different techniques are required to improve the accuracy or the convergence of the models.
© 2011 ANSYS, Inc. August 25, 201159
Advanced Nonlinear Methods
User can now perform:→Buckling from a nonlinear prestressedstate, including dead loads
→3D rezoning for very large deformations for a wider range of materials and boundary conditions.
Hot-Rolling Structural Steel Analysis with 3-D Rezoning
Buckling of a pre-stressed stiffened container
© 2011 ANSYS, Inc. August 25, 201160
Analyzing Fasteners under Large Deformations
Bolt pretension does not include large rotation effects.
With release 14.0, you can now use Joint Loads:→Lock joint at specific load step→Apply Pre-Tension or Pre-Torque load→use iterative PCG solver for faster runtime
Joint Element - Stress appears without significant bending
Pre-tension element - Significant bending stress with large rotation
© 2011 ANSYS, Inc. August 25, 201161
Coupled structures/acoustics simulations
Coupled problems are modeled more efficiently:→Quadratic tetrahedral acoustics elements→New acoustics sources→Absorbing areas→Enhanced PML formulation → Near and far-field parameters
© 2011 ANSYS, Inc. August 25, 201162
Moisture Diffusion
Moisture induces hydroscopic stresses and alters thermal stresses.
Coupled-field elements allow to incorporate moisture effects in thermal, structural and coupled simulations.
© 2011 ANSYS, Inc. August 25, 201163
Advanced Modeling
Explicit Analysis
© 2011 ANSYS, Inc. August 25, 201164
Motivation
Explicit formulations extend the range of problems a structural engineer can solve.
Providing handling capabilities similar to implicit solutions provides an easy transition from implicit to explicit.
© 2011 ANSYS, Inc. August 25, 201165
A Common User Interface
Implicit and explicit solutions share the same user interface for a shortened learning curve and allow straightforward data exchange between disciplines
Crimping
© 2011 ANSYS, Inc. August 25, 201166
New tetrahedral element
The new tetrahedral element helps quickly model complex geometries for low velocity applications such as drop tests for mobile phones or nuclear equipmentsSelf Piercing Rivet
© 2011 ANSYS, Inc. August 25, 201167
Similarly to implicit analyses, 2D plain strain and axisymmetricformulations provide faster computation of explicit solutions
Fast Solutions Using 2-D Formulations
2D forming
Axisymmetricbullet model
© 2011 ANSYS, Inc. August 25, 201168
Geometry
Advances for Structural Engineers
© 2011 ANSYS, Inc. August 25, 201169
Motivation
With every release, ANSYS improves the quality of the geometry tools available in Workbench in order to increase the quality of the geometric data.
Ease of use is also constantly improved to provide more efficient tools.
© 2011 ANSYS, Inc. August 25, 201170
Mid Surfacing Improvements
Selection tolerance is available to handle face pairs in case of imperfect offsets.
Body thicknesses can be displayed on the model.
© 2011 ANSYS, Inc. August 25, 201171
Usability Enhancements
Toolbars can be customized for easy and direct access to preferred features and tools.
Hot keys are also available for frequently used operations.
© 2011 ANSYS, Inc. August 25, 201172
SpaceClaim Direct Modeler
“Preview sharing” allow to control topology sharing before transferring the model into Workbench.
“Multi-face patch” option increases the quality of repairs for missing faces.
Regular patch
Multi-face patch
© 2011 ANSYS, Inc. August 25, 201173
Physics Coupling
System Optimization with Rigid Body Dynamics and Simplorer co-simulation
© 2011 ANSYS, Inc. August 25, 201174
Motivation
Most mechanisms and assemblies are managed via control systems.
System simulation, including the details of the mechanism or assembly, are needed in order to improve modeling accuracy, fidelity and ultimately system optimization.
© 2011 ANSYS, Inc. August 25, 201175
Linking Mechanical and Simplorer
Inputs and outputs are defined as “pins” in the Mechanical model and connected to the schematics of Simplorer
© 2011 ANSYS, Inc. August 25, 201176
Simulation Results
Force Applied on Pistons Rotational Displacement
Rotational Velocity
© 2011 ANSYS, Inc. August 25, 201177
Some Examples
Aircraft Landing Gear
Simplorer schematic of hydraulic circuit and control
RBD model
Robotic Arm Control
Trace of arm trajectory
© 2011 ANSYS, Inc. August 25, 201178
And there is much more…
© 2011 ANSYS, Inc. August 25, 201179
…check the Release Notes!
© 2011 ANSYS, Inc. August 25, 201180
Think also of the “Technology Demonstration Guide”
© 2011 ANSYS, Inc. August 25, 201181
Thank you for attending this session
