r15.0 structural updateesss.com.br/events/ansys2014/argentina/pdf/14.05_1130...available • helps...
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© 2014 ANSYS, Inc. May 27, 2014 1
R15.0 Structural Update
Tim Pawlak
R&D Fellow
ANSYS
© 2014 ANSYS, Inc. May 27, 2014 2
Geometry and Mesh
Material Behavior
Numerical Methods
Composites
Dynamics
Submodeling
Multiphysics
Solvers
User Interface
Model Assembly
Structural Update Topics
© 2014 ANSYS, Inc. May 27, 2014 3
Geometry and Mesh
Goals: increase speed , reduce memory usage, improve robustness
© 2014 ANSYS, Inc. May 27, 2014 4
• Share topology faster
• Multi-body parts can have instances
• Shared topology for multi-body parts new options
• Slice plane
• Units changeable
• Hot keys
Geometry Highlights
Shared topology
Sliding contact (no shared topology)
Multi-body part
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Meshing Highlights
Faster executions
• Size Function and Body of Influence
• Methods: Patch Conforming Tet, Sweep, MultiZone, Shell Meshing
Lower memory requirements
New parallel parts meshing
• Simultaneously meshes multiple parts in an assembly on multiple CPU’s
• Works for all part mesh methods
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Meshing Speed
Customer Models
© 2014 ANSYS, Inc. May 27, 2014 7
Meshing Failure Handling
Improved failure handling – Better indication of failed mesh based on
color: Out of date, Failed
– Edge coloring tool use to locate problem area
Out of date mesh
Failed mesh
Edge coloring indicate where problem area
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MultiZone Mesh Sizing
Line BOI
Solid BOI
SOI
Works with Body/Sphere of Influence (BOI/SOI)
Support for inside out biasing
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Meshing Reverse Edge Bias
Option in edge sizing for biasing to reverse edge direction for selected edges
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Material Behavior
© 2014 ANSYS, Inc. May 27, 2014 11
• T-stress: stress acting parallel to the crack faces now available
• Helps predict stability and whether the crack will deviate from the original plane
• R&D continues on crack growth simulation based on XFEM
Fracture Mechanics *
* Stress intensity factor K and the elastic T-stress for corner cracks L.G. ZHAO, J. TONG and J. BYRNE
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Cohesion Failure
• Can now simulate in Mechanical e.g. adhesive failure
• Two methods available
• Interface delamination (CZM: Cohesize Zone Material based)
• Contact de-bonding
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• New functionality allowing estimation of wear due to friction
• Generalized Archard Wear model with parameters as a function of temperature
• Contact nodes are physically moved
Wear Modeling
Wear
Pressure
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• Combine rate independent behavior of Chaboche Kinematic Hardening with rate dependent implicit creep
• Material Curve Fitting for Chaboche model
• Shape Memory Alloy support for beam elements allows for faster modeling and computation of structures
Materials Models
Beam188 Solid185
Total Solution Time BEAM188 : SOLID185=1:4
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Numerical Methods
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• Automatic mesh splitting and morphing
• Criteria based selections for: element distortion, mean strain energy, and contact status
• Load step and region specific rules can be defined
Mesh Adaptivity
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• Simulate without physically modeling threads as a contact setting
• Accuracy closer to true thread modeling than bonded MPC method and much faster
Bolt Thread Modeling
True Thread Simulation Bolt Section Method MPC Method
Wall
Time
Elements
True Thread Model 115 hrs 1.1 M
Bolt Section Method 12.75 hrs 69K
MPC Method 11.65 hrs 69K
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Composites
© 2014 ANSYS, Inc. May 27, 2014 19
• Layered thermal solid composites now in Mechanical
• Continuum Damage Mechanics based Progressive Damage of Composites
• Interface delamination layer can now be defined in ACP and imported in Mechanical
Composites
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VCCT Based Crack Growth Modeling
• Mechanical now supports the ability to model crack growth along a pre-determined path
• Virtual Crack Closure Technique (VCCT) used to compute energy release rate with five optional failure criterions
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• Performance improvements in post evaluation, save, resume
• Interlaminar shear and normal stress for solid composites improved
ACP (Composites)
Interlaminar Shear Stress in R145
Interlaminar Shear Stress in R15
Reference SHELL results SOLID @ R14.5 SOLID @ R15.0
Thic
knes
s
Interlaminar Shear Stress
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Dynamics
© 2014 ANSYS, Inc. May 27, 2014 23
• CMS generation for general & gyroscopic damping
• Large rotation super elements more accurate (CMS) comparing to full model
Linear Dynamics
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• Uses Mode Superposition Harmonic (Expansion performed on-the-fly)
• For example: applying pressure load from CFX TBR results to MAPDL while ensuring consistency between models (e.g. axis of rotation, speed, engine order)
Forced Response for Cyclic Structures
CFX TBR
MAPDL
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• Pre-Stressed FULL Harmonic now supported (e.g. structure with gravity)
• Reduced results data by expanding results only at user selected frequency points
• Frequency Dependent Loading now supported for Pressure, Force, Moment, Acceleration, etc.
• Phase Angle Input for Remote Force and Moment
• Bearings and bearing probes in all analysis
Linear Dynamics in Mechanical
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• Parallel Trajectory Contact (TC)
• For all “unstructured” FE solvers
• With/Without erosion
• Including Euler-Lagrange Coupling
• Implicit-Explicit Enhancement
• Pressure initialization for models where only final deformed geometry is known from implicit pre-stress
Explicit Dynamics
0,5
1,5
2,5
3,5
4,5
5,5
6,5
7,5
8,5
0 5 10 15
Spee
d-U
p
Number of slaves
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• Workbench user interface
• Joint project between ANSYS and LSTC
• Interactive pre-processing, solve, and post-processing
• No additional fee for existing LS-DYNA users (with current TECS)
• ACT extension download on ANSYS Customer Portal
LS-DYNA From Within Mechanical
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• Improved handling of large assemblies
• CMS bodies (R&D)
• New loads
• Follower load
• FFT based loads
• RBD coupling with aeroelastic software
Rigid Body Dynamics
Road Profile
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Submodeling
© 2014 ANSYS, Inc. May 27, 2014 30
• Now available for Shell-Shell and Shell-Solid
• Available for ACP systems
• Coordinate systems used to align source and target data
• Validation for data transfer available
Submodeling Enhancements
© 2014 ANSYS, Inc. May 27, 2014 31
Submodeling Example: Shell to Solid
2D to 3D submodeling enables computation of locally refined results that are not captured in a larger surface model Surface model
Solid model
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Multiphysics
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• Can now be Time and Frequency Dependent
• Now includes pressure to nodes, initial stress, and initial strain (corner or element centroids)
• UV weighting to handle dissimilar geometries
• Imported loads can be duplicated
Imported Loads
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• Multi-frame restart with 22X helps with transient problems having thermal-electric physics e.g. Joule Heating
• Linear perturbation now supported with 22X elements e.g. piezoelectric
• Fast thermal solver is now supported with distributed solver
Thermal & Coupled Physics
Image courtesy of Piezo Systems, Inc.
Image courtesy of Marlow Industries
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• New OCZONE command now allows for a simplified input of ocean environment boundary conditions definition
• ACT Extension for offshore loads and boundary conditions support in Mechanical
• Hydrodynamic coefficients which are part of the ocean load can now be a function of depth or Reynolds number
Offshore Enhancements
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• Aqwa Workbench Integration
• Wider meshing exposure
• Time domain animations with wave surface
• Drag linearization
• Increased model solution size
Aqwa Enhancements
Characteristic Limit
Nodes 46000
Elements 40000
Diffracting Elements 30000
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Solvers
© 2014 ANSYS, Inc. May 27, 2014 38
• New subspace eigen solver supports shared and distributed parallel technology
• New MSUP harmonic method for unsymmetric systems (e.g. vibro-acoustics)
Solver Technology
2.09 MDofs first 20 modes
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• Improved Scalability of distributed solver at higher core counts
HPC Scalability
Couple Acoustic, 1.2 M DOF, Full Harmonic Response
• First major commercial CAE provider supporting INTEL Xeon Phi • Turbine Blade
• 2.1M DOF
• SOLID187
• Static, nonlinear
analysis
• One iteration
• Sparse solver
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• ARCLENGTH typically used for applications like nonlinear buckling, sheet warping
• Made more robust
• Supports
• MPC bonded contact
• Mixed shell/solid and U/P formulation elements
• Distributed parallel solver
ARCLENGTH Improvements
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Newton-Raphson Option in Mechanical
• Available in GUI
• Default (Program Controlled) is MAPDL default even when contact friction coefficient is greater than 0.2 in nonlinear Static and Transient systems
• Software revision behavior change
• Warning message is displayed
• Following modal analysis will correctly handle settings
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User Interface
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• In graphics window
• Element information accessible
• Named selection
• GUI or criterion based selection (type, mesh quality, location, etc.)
• Export selection also written into solver input as element component
• Results for elements
• Regular and user defined results
Element Selection
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• Can average results across bodies in a multi-body part
• New visualization options for results scoped to body or face, other bodies are hidden (default) instead of translucent
Results Visualization Unaveraged Averaged
R14.5
R15.0
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RMB command on solution object in addition to toolbar
Table of Results available for: Regular Results, User Defined Results, Force Reactions, Moment Reactions, Spring Probe, Bolt Pre-Tension Probe, and Joint Reactions
Results Summary Worksheet
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• Keyboard shortcuts e.g. Ctrl+ A = Select All
F9 = Hide Body
• Scoping to nodes e.g. Remote Forces, Remote Displacements, Joints, Springs, Beam Connections, Point Masses
• Compression only support Option to control stiffness behavior
Miscellaneous
© 2014 ANSYS, Inc. May 27, 2014 47
Miscellaneous
• Higher order Thermal SHELL132 is now supported
• Pre-tension bolt load now allows for increment adjustment accounting for displacement from previous load step
• Contact worksheet now shows information on beams and springs
• Nonlinear spring and joint stiffness
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Tree Filtering
Filtering is helpful in dealing with large models with many items in the tree Tree can be filtered by boundary condition objects, connections objects, or command objects in addition to results Filtering can also be used to reduce the report to only the selected items
© 2014 ANSYS, Inc. May 27, 2014 49
Model Assembly
© 2014 ANSYS, Inc. May 27, 2014 50
• Using External Model system
• Surfaces synthesized by angle tolerance and/or components
• Mesh only import
• Rigid transforms available
• Import MAPDL models (CDB files) including pre-meshed fracture models
• Contact detection available after import
Import Mesh
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• Can combine External Model with Read Results Files
Import Mesh
test-1.cdb
(Mechanical used to process results)
© 2014 ANSYS, Inc. May 27, 2014 52
• Combine pre-existing models
• Geometry, Mesh and Named Selection assembled
• Simulation completed on assembled model
• Can define transformations and copies
Model Assembly
+ =
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Model Assembly
Allows subdivision and reassembly of models
Original Assembly Sub-Assembly models can be worked on independently, and later assembled
Upper Sub-Assembly
Lower Sub-Assembly
Shaft/Connector Sub-Assembly
Sub-Assembly models are updated separately
at project level
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Original model includes geometry, mesh, named selections
Model Assembly Example
2 copies and rotation specified
© 2014 ANSYS, Inc. May 27, 2014 55
Model Assembly Example
Mesh and Geometry are exact copies in the combination
© 2014 ANSYS, Inc. May 27, 2014 56
Check the Release Notes!
© 2014 ANSYS, Inc. May 27, 2014 57
Check the “Technology Demonstration Guide”