Improving Your Structural Mechanics Simulations … Your Structural Mechanics Simulations with ......
Transcript of Improving Your Structural Mechanics Simulations … Your Structural Mechanics Simulations with ......
© 2011 ANSYS, Inc. October 12, 20111
Improving Your Structural Mechanics Simulations with Release 14.0
© 2011 ANSYS, Inc. October 12, 20112
What will Release 14.0 bring you?
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MAPDL/WB Integration
Finite Element Information Access within ANSYS Mechanical
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ANSYS Workbench is originally a geometry based tool. Many users however also need to control and access the finite element information.
Motivation
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Spot Welds
Connections created internally at the solution level are available and can help understand the results
Reviewing Connections
Weak springs and MPC contacts as generated by the solver
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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
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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 are oriented in cylindrical system for loads and boundary condition definitions
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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
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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
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MAPDL/WB Integration
Linear Dynamics in ANSYS Mechanical
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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
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Physics Coupling
Data Mapping
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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.
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Supported Data Types
New at R14.0
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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
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Validating the Mapped Data
Visual tools have been implemented to control how well the data has been mapped onto the target structure
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Importing Multiple Files
Multiple files can be imported for transient analyses or to handle different data to be mapped on multiple bodies
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Rotating Machines
Studying Rotordynamics in ANSYS Mechanical
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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)
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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
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Specific Solver Settings
Rotordynamicsanalyses require a number of advanced controls:
→Damping
→Solver choice
→Coriolis effect
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Campbell Diagrams
Campbell diagrams are used to identify critical speeds of a rotating shaft for a given range of shaft velocities
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Composites
Enhanced Analysis Workflow and Advanced Failure Models for Composites
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Motivation
Efficient workflows and in‐depth analysis tools are required to model and understand complex composites structures
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Defining Material Properties
Composites material require specific definitions including orthotropic properties, as well as some constants for failure criteria (Tsai‐Wu, Puck, LaRc03/04, Hashin)
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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
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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
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Investigating Composites Results
ANSYS Mechanicalsupports layerwisedisplay of results.
ANSYS Composite PrepPost offers comprehensive capabilities for global and plywise failure analysis.
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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)
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Customization
ANSYS Design Assessment
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Motivation
Many of you have expressed the need for:→Computing and displaying specific results→Be able to achieve more complex “User defined results”
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What is Design Assessment?
The Design Assessment system enables the selection and combination of upstream results and the ability to optionally further assess results with customizable scripts
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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
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Design Assessment for Advanced “User Defined Results”
Design Assessment enable users to extend user defined results capabilities with:
→Expressions using mathematical operators as supported by Python
→Coordinate systems, Units Systems
→Integration options
→Nodal, Element‐Nodal & Elemental result types
→Import from external tablesScript used to display scalar element data stored
in an external file
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Thin Structures
Mesh Connections
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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.
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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
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Modal Analyses Shows Proper Connections of the Various Bodies
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Contact Analysis
Rigid Body Dynamics
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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.
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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
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Contact Analysis
Flexible bodies
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Motivation
While already providing leading edge technology, ANSYS continues to enhance its ability to robustly and efficiently solve complex contact problems
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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
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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
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Performance
Further benefits from GPU boards
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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
+
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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
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Speed‐up from GPU technology
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
MoldPCB
Solder balls
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Speed‐up from multiple nodes with 1 GPU board per node
MoldPCB
Solder balls
Results Courtesy of MicroConsult Engineering, GmbH
1 node @ 8 cores no GPU
1 nodes @ 8 cores, 1 GPU
8 nodes@ 1 core, 8 GPU
2 nodes@ 4 cores, 2 GPU
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Advanced Modeling
Material Models
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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.
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→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
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Nonlinear materials support for coupled field elements
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
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Advanced Modeling
Advanced Methods
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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.
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Advanced Nonlinear Methods
User can now perform:→Buckling from a nonlinear prestressedstate with dead loads (new subspace eigensolver)
→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
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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
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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
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Moisture Diffusion
Moisture induces hydroscopic stresses and alters thermal stresses.
Coupled‐field elements allow to incorporate moisture effects in thermal, structural and coupled simulations.
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Advanced Modeling
Explicit Analysis – 1:30pm Session
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Geometry
Advances for Structural Engineers
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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.
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Mid Surfacing Improvements
Selection tolerance is available to handle face pairs in case of imperfect offsets.
Body thicknesses can be displayed on the model.
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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.
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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
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And there is much more…
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…check the Release Notes!
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Think also of the “Technology Demonstration Guide”
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Questions?