R15.0 结构力学新功能详解 - register.ansys.com.cnregister.ansys.com.cn/ansyschina/minisite/201411_em/motordesign/...© 2013 ANSYS, Inc. November 21, ... any a restartable time

© 2013 ANSYS, Inc. November 21, 2014

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R15.0 结构力学新功能详解


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Topics主题

R15.0

Preprocessing

Modeling Nonlinear Material Behavior

Numerical Methods

Composites Modeling

Implicit & Explicit Dynamics

Solver Technology

Workflow Improvements


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Preprocessing 前处理


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Motivation动因

With R15.0, we have pursued three main goals for preprocessing: increase the performance, reduce memory requirements and improve robustness of algorithms.


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• Share Topology Performance

• Shared Topology feature is now significantly faster

• Support instancing for multi-body parts

• Custom Shared Topology for Bodies

• Users can now apply a Shared Topology Method to bodies within a multi-body part

Geometry Highlights 几何建模亮点

Shared Topology

Sliding contact (no shared topology)

Update this


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Meshing: Mesh Failure Handling网格处理

Improved failure handling – Better user indication of failed mesh based

on color – Out of date, Failed mesh – When Meshing fails the failed mesh is

displayed to the user for further diagnosis – Use edge coloring tool to locate problem

region

Out of date mesh

Failed mesh

Edge coloring can indicate where problem is


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• Improved robustness for swept mesh along varying profiles (blades, etc.)

15.0 Meshing: Hex meshing robustness 六面体网格划分


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15.0 Meshing: Hex meshing robustness 六面体网格划分 • Improved side face handling

Circular loops need to be mapped (all side faces

need to be mapped)

Inflation is needed to make the H-Grid on mapped cylinder an

O-Grid with good quality


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Advances in Modeling Nonlinear Material behavior

非线性材料行为建模新进展


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Motivation动因

Engineers need a way to investigate different faults that might appear in the service life of a product. This could be cracks from manufacturing/fatigue or wearing of material due to friction or creep over the operating life of the product.


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• The T-stress represents the stress acting parallel to the crack faces

• T-Stress calculation is now supported in R15

• It helps predict stability and whether the crack will deviate from the original plane

• Continued R&D on crack growth simulation based on XFEM

Fracture Mechanics断裂力学 *

* Stress intensity factor K and the elastic T-stress for corner cracks L.G. ZHAO, J. TONG and J. BYRNE


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Material Cohesion Failure材料结合失效

• You can now simulate material cohesion failure in Mechanical e.g. adhesive failure

• Two methods are supported – • Interface Delamination - CZM (Cohesize

Zone Method) laws based • Contact debonding

• For Interface Delamination, matching mesh is required and interface elements are automatically created

• Contact Debonding method does not require matching mesh, uses contact pair


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• New functionality in R15 allows you to estimate wear of a part due to friction

• Generalized Archard Wear Model where parameters can be function of temperature

• User Defined Wear model is also supported

• Contact nodes are physically moved

Wear Modeling磨损建模

Wear

Pressure


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• Support implicit Creep with Chaboche Kinematic Hardening

• Support for USER CZM laws for modeling advance delamination

• Option to Control results output data of User State variable, which helps reduce size of the RST file

• Shape Memory Alloy support for beam elements allows for faster modeling and computation of structures

Materials Technology材料技术 Beam188 Solid185

Total Solution Time BEAM188 : SOLID185=1:4


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Application: Simulation of Spring Actuator 弹簧操纵机构仿真

Beam188 Solid185

Total Solution Time: BEAM188 : SOLID185=1:4

At the end of step 1

End Displacement vs Temp

step1

step2

step3


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• We now support curve fitting for Chaboche kinematic hardening plasticity model

• Multiple stress-strain curves can be provided as input

• Temperature dependent data is supported

Curve Fitting for Chaboche Chaboche材料曲线拟合


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Advances in Numerical Methods

数值方法新进展


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Motivation动因

Some products in their operating conditions undergo severe deformation. In some cases it is desirable to accurately capture details of small features in a analysis e.g. threads. Special solver methods or approaches are required to meet these needs


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• Automatic Mesh splitting and morphing would allow for local topology correction so that problems become solvable

• Criteria based nonlinear adaptivity supports element distortion, mean strain energy and contact status

• Load Step and Part/Region specific rules can be defined

Nonlinear Adaptivity非线性自适应


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Rezoning in ANSYS(2d): Axis-Symmetric analysis of Downhole Packer (Oil Industry) ANSYS重划分：井下封隔器轴对称分析（石油工业）

Flow pipe

Outer casing

Mandrel

Copper supports

Packer

Semi-automatic rezoning using 15 rezoning steps.

Self Contact

Elastomeric seal ‘flows’

around the support


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• Account for Bolt Threads without physically modeling the threads

• Since threads are not modeled, there is no penalty of meshing and hence faster solution

• Accuracy closer to true thread modeling than bonded MPC method, and much faster

Bolt Thread Modeling螺栓螺纹建模

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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3D threaded model 3D threaded Bolt & contact status

3D Unthreaded Bolt & contact status 3D Unthreaded model

pretension load of 256446 N

Bolt-Thread Modeling: 3D example 螺栓螺纹建模：3D实例


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Planning/Understanding UPFs 计划/理解UPFs

Friction Coef.

Real constants

Extra state variables

Tangential interaction

Normal interaction

Thermal-structural interaction

Thermal-electric-structural interaction

Contact Damping (time or Frequ)

Tabular friction x

Tabular real constants

x

User programmable real constants USERCNPROP

x x

User programmable friction law USERFRIC

X x x x x

User programmable interactions USERINTER

X x x x x x x x


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Advances in Composites Modeling

复合材料建模进展


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• Layered Thermal Solid composites are now supported in Mechanical for models with Imported Layered Sections

• Continuum Damage Mechanics based Progressive Damage of Composites

• Interface delamincation layer can now be defined in ACP and imported in Mechanical to simulate VCCT based failure of composites

Composites复合材料


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VCCT based crack growth modeling 基于VCCT裂纹生长建模

• Mechanical now supports the ability to model crack growth along a pre-determined path

• Virtual Crack Closure Technique (VCCT) technique, based on energy release rate supports five failure criterions to initiate failure

• Node matching across interface is required

• Mechanical will automatically create interface elements to facilitate crack growth


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Streamlined Composites Simulation 流线型复合材料仿真

How can recent advances in ANSYS facilitate composite simulations ?

Materials, Layups & Mesh B/Cs and Simulations

Composite Post-Processing Model/Cleanup

Design Studies

• Composite PrepPost integrated into Workbench workflow • Upstream changes in design propagate through to the results • In this example we might look at sensitivity of geometry size, shape or layups to deformation, natural frequencies, and failure margin


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• Performance improvements in post evaluation, save-resume etc.

• Interlaminar shear and normal stress for solid composites

• Ability to export ply/laminate surfaces in STL format

Ansys Composite Prepost enhancements ANSYS复合材料前处理增强

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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Advances in Implicit & Explicit Dynamics

隐式&显式动力学新进展


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• CMS generation for general & gyroscopic damping

• Forced Response (MSUP Harmonic ) of Cyclic Symmetric structures e.g turbine blades

• Miscellaneous • Better Mode filtering for MSUP methods

leading to faster solution and smaller results files

• Precise Mass Summary for 3D models now available (for e.g. mass from CMS bodies now included, non-diagonal mass terms reported)

Linear Dynamics 线性动力学……


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Linear perturbation – available for most of the pre-stressed analyses 线性扰动-可用于大部分预应力分析

Goal of Linear perturbation analysis: – We provide the capability of perturbation (i.e. pre-stressed) analysis at

any a restartable time point from a prior static or full transient analysis.

– Perturbation Analysis types: • Perturbed modal (all eigensolvers) • Perturbed buckling (LANb and SUBS) • Perturbed FULL harmonics • Perturbed linear static • Perturbed MSUP harmonic • Perturbed MSUP transient • Perturbed spectrum (all) • Perturbed FULL transient (future)

02468

101214161820

0 1 2 3 4 5 6 7

solution

Do it here

Nonlinear solution


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• Pre-Stressed FULL Harmonic now supported e.g. a structure under stress due to gravity loading

• Pre-Stress FULL Harmonic is based on Linear Perturbation and supports Modal Restart

• For Harmonic Analysis • Reduced Results data by expanding

Results only at user selected Frequency points

• Frequency Dependent Loading now supported for Pressure/ Force/Remote Force

Linear Dynamics Contd. 线性动力学……


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• NROPT option controls how often tangent stiffness is updated in a static/transient solution

• Mode Reuse option is now exposed. It can be a time saver for big models where complex modes needs to be extracted

Linear Dynamics Contd 线性动力学


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Mass calculation – Theory 质量计算-理论

The calculate the total rigid body mass matrix


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Mass summary for CMS Model CMS模型的质量概要

14.5

15.0


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User defined mode table Example I 用户自定义模式表例1

The table definition and MXPAND command can be added to WB command snippet at “T=0 Modal” level

User can post-process and examine the modes. He can then create the table


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• Parallel Trajectory Contact (TC) • All “Unstructured” FE Solvers • With/without Erosion • Euler-Lagrange Coupling (including

TC)

• Enhanced Connections • Spring/Damper Exposure

• Implicit-Explicit Enhancement • Pressure Initialization for cases

where only final deformed geometry known from implicit analysis

Explicit Dynamics 显式动力学

0.51.52.53.54.55.56.57.58.5

0 5 10 15

Spee

d-U

p

Number of slaves


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• Improved Handling of Large Assemblies • CMS Bodies in RBD (R&D)

• New Loads • Follower Load • FFT Based Loads

• RBD Coupling with Aeroelastic Tools

Rigid Body Dynamics (RBD) 刚体动力学

Road Profile


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Advances in Multiphysics

多物理场新进展


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• Submodeling now supports SHELL-SHELL, SHELL-SOLID and SOLID-SOLID bodies for Thermal/Structural

• Use coordinate systems to align source and target data

• Imported Loads will now support Time and Frequency Dependent loading

• Option to apply Imported pressure to nodes (corner) or element centroids

• Imported Loads can be Duplicated

Mapping Enhancements 映射技术增强


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• Import Velocity Loads in a Harmonic Analysis

• Also support import from one Structural Harmonic system to another e.g. if the other system is Acoustics

• Import and apply data at multiple frequencies

• Real and imaginary terms supported

Import Velocities Data导入速度数据


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• External Data allows you to import TENSOR data (Stress/Strain) from any source and apply as loads in Mechanical

• Supports Static and Transient Structural systems

• Supports 2D to 3D mapping of Data

Import Tensor Data in Mechanical Mechanical中导入张量数据


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• Boundary Layer enhancements allows for accurate modeling for sound flowing through narrow structures

• Transfer Admittance matrix allows for simple acoustic representation of complex structures eg. Perforated plates

• Frequency dependent support for • Basic properties eg. Density, viscosity etc. • Loads such as impedence, velocity etc. • Perforated Material models added

• One-way Coupling - Structure to Acoustics for vibrating structures

Vibro-Acoustics Technology 振动-声学技术


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• Multi-frame Restart with 22X Helps with transient problems with thermal-electric physics e.g. Joule Heating,

• Linear Perturbation now supported with 22X elements for Piezoelectric and LF EMAG applications

• Fast Thermal solver is now supported with distributed ansys

• View Factor data available in compressed binary format or higher precision ascii file

Thermal & Coupled Physics 热&耦合物理

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 海洋分析技术增强


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Advances in Solver Technology

求解器技术新进展


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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

• Sparse Solver improvements for rigid motion and handling of Constraint Equations

Solver Technology求解器技术

2.09 MDofs first 20 modes

Preliminary results


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All runs with Sparse solver Hardware 12.0: dual X5460 (3.16 GHz Harpertown Intel Xeon) 64GB RAM per node Hardware 12.1 + 13.0: dual X5570 (2.93 GHz Nehalem Intel Xeon) 72GB RAM per node ANSYS 12.0 to 14.0 runs with DDR Infiniband® interconnect ANSYS 14.0 creep runs with NROPT,CRPL + DDOPT,METIS

Distributed ANSYS Performance: a progress review (from weeks to hours)分布式ANSYS性能：进度检查（从几周缩短到几小时）

ANSYS 11.0 ANSYS 12.0 ANSYS 12.1 ANSYS 13.0 SP2 ANSYS 14.0

Thermal (full model) 3 MDOF

Time 4 hours 4 hours 4 hours 4 hours 1 hour 0.8 hour

Cores 8 8 8 8 8 + 1 GPU 32

Thermomechanical Simulation (full model) 7.8 MDOF

Time ~5.5 days 34.3 hours 12.5 hours 9.9 hours 7.5 hours

Iterations 163 164 195 195 195

Cores 8 20 64 64 128

Interpolation of Boundary Conditions

Time 37 hours 37 hours 37 hours 0.2 hour 0.2 hour

Load Steps 16 16 16 Improved algorithm 16

Submodel: Creep-Strain Analysis 5.5 MDOF

Time ~5.5 days 38.5 hours 8.5 hours 6.1 hours 5.9 hours 4.2 hours

Iterations 492 492 492 488 498 498

Cores 18 16 76 128 64 + 8 GPU 256

Total Time 2 weeks 5 days 2 days 1 day 0.5 day

Results Courtesy of MicroConsult Engineering, GmbH


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• Balanced system for overall optimum performance

1.0x 2.7x 5.2x

12.5x

5.7x

12.0x

24.8x 27.3x

0

5

10

15

20

25

30

2 cores 8 cores 8 cores +GPU

8 cores +GPU + SSD

Rela

tive

Spee

dup

Balanced Performance

IO Bound

Compute Bound

Maximizing Performance - Putting it all together最大限度地提高性能

• 2.1 million DOF • Nonlinear static analysis • Direct sparse solver (DSPARSE) • 2 Intel Xeon E5-2670 (2.6 GHz, 16 cores total) • 128 GB RAM • SSD and SATA disks • 1 Tesla K20c, • Windows 7


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• ARCLENGTH solver is typically used for applications like nonlinear buckling, sheet warpage etc.

• Re-written, More robust at R15, supports

• MPC bonded contact • Models with mixed shell/solid elements and

elements with U/P formulation • Remote loads, Tabular loads (need to be

linear), Non zero displacement boundary conditions

• Distributed Parallel Processing

Enhancements to ARCLENGTH solver 弧长法求解器增强


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Workflow Improvements

工作流程改进


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• Keyboard Shortcuts now supported in Mechanical e.g. Ctrl+ A: Select All Objects, Ctrl+ B: Body Filter Selection

• Directly scope to Nodes • Remote Forces, Remote

Displacements, Joints, Springs, Beam Connections, Point Masses

• Compression only Support offers option to control stiffness behavior

Miscellaneous其它亮点


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• Average results across bodies in a multi-body part

• Better visualization when results scoped to a body or face. Other bodies are hidden (default) instead of translucent (no need to hide parts in tree)

• Path definition is now improved, you can use node selection to Locate the Path

Post Enhancements后处理增强 Unaveraged Averaged

R14.5

R15.0


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Miscellaneous 其它亮点

• 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

• More enhancements to Tree filtering further helps working with large number of objects


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• Ability to import CDB file in to Workbench using *new* External Model system

• Mesh only import, Rigid transforms supported

• Import older MAPDL models, pre-meshed Fracture models

• Support for SHELL, SOLID elements • Contact detection possible after

reading in assembly of mesh • Supports multiple CDB files

• Support for other mesh formats (beta)

Import Mesh 导入网格


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• Combine ‘External Model’ with ‘Read Results Files’

• Mechanical as a standalone post-processor

• Beta at R15

Import Mesh contd. 导入网格

test-1.cdb


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• Combine multiple Systems - Support Geometry, Mesh and Named Selections at R15

Model Assembly 模型组装


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Thank You

Documents

R15.0 结构力学新功能详解 - register.ansys.com.cnregister.ansys.com.cn/ansyschina/minisite/201411_em/motordesign/...© 2013 ANSYS, Inc. November 21, ... any a restartable time