© 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

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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color: Out of date, Failed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Out of date mesh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

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• 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

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• 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

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• 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

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• 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

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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

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• 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

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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

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Model Assembly

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• 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)

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• 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

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Model Assembly Example

Mesh and Geometry are exact copies in the combination

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Check the Release Notes!

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Check the “Technology Demonstration Guide”