ANSYS 12.0 Update Structural Mechanics

© 2009 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary

ANSYS 12.0

New Features

Structural

Mechanics

Capabilities

© 2009 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary

12.0 Highlights in Structural

Mechanics Capabilities

• New Workbench Framework

• Advances in Meshing Technology

• New Element Technology

• Additional Material Models

• Solver Performance Enhancements

• More Native Workbench Capabilities


ELEMENT TECHNOLOGY


New Element Technology

New 4-noded Tetra element : SOLID285

DOF: Displacements & Hydrostatic Pressure

Stabilized formulation to satisfy LBB check

Benefits

Can be used to mesh complex geometries

Element is less sensitive to distortion

Vital to rezoning and nonlinear adaptivity

analysis

Applications

Good for incompressible materials

Ideal for Forming and Hyperelasticity

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ezyx uuu ),,(

),,,( puuu zyx

),,,( puuu zyx

1

2

3

4

),,,( puuu zyx

),,,( puuu zyx

DOFsInternal

Automotive

Suspension

Mount


ZF Boge Elastmetall

By use of "solid285" the operating time for

meshing of complex structures is

considerably reduced. The close

correlation between analysis and thephysical measurement enables the spring

rate determination of strongly deformed

structures possible, without complex and

time consuming meshing with hexahedral

elements.

Only the use of "Solid 285" enables the

determination of stresses and strains for

durability calculation in a reasonable time

possible.

Hans-Jörg Hinterkeuser

FEA Engineering

Norbert Urban

FEA Engineering

0.00

500.00

1000.00

1500.00

2000.00

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0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00

Displacement [mm]

Fo

rce

[N

]

Measurement: Solid 285:

Measurements vs. Simulation



General Axi-symmetric Element: 272/273

3D elements generated based on 2D mesh

Boundary conditions applied in 3D space

Nonlinearities, Node to surface contact

Benefits

Multiple Axis can be defined in any direction

Take advantage of axi-symmetry but

deformation is general in 3D

1 element in Θ (hoop) direction

Application

Detailed simulation of threaded connections

Bio-Medical: Tooth implanting

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I

L

J

K

A

B

Y‟Z‟

X‟

3D view of shaft


Shaft

Valve BallValve

Cams

SOLID272: hrsFULL 3D : 13.7 hrs

Example: Cam-Shaft

meshed with

SOLID272

3D elements



3D Finite-strain Element: PIPE288/289

Linear or quadratic pipes in 3D

Thin pipe (plane stress) and Thick pipe

(3D stress) option

Internal fluid and external insulation

Benefits

Increased accuracy

Robust nonlinear infrastructure including

stabilization

Hydrostatic, current, and wave loading

Application

Slender or stout pipe like structures

Undersea piping and cabling,

Chemical, Nuclear Power Industry,

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Pipe 288

Pipe 289

Piping Assembly



New Curved Pipe Element: ELBOW290

Internal nodes for C/S deformation

C/S Deformation with Fourier series

Radial expansion, ovalization & warping

Follower effects of distributed pressures

Benefits

Accurate and easy to use

Supports layered cross-section

Broad nonlinear material library

3D Visualization

Applications

Accurate modeling of curved pipe

structures

Composite pipes, cables, nuclear piping

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Warping & Ovalization



Shell Formulation Improvements:

SHELL181/281/208/209: Improved shell

thickness updating scheme

SHELL 281: include initial curvature

effects

Benefits

Increased Accuracy

Improved solution convergence

Accounts for increase/decrease in

curvature

Application

All thin structures with curved shape

Example: Cooling of a curved plate

shows accurate calculation of

displacement

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0.920910.915190.0Rotation of

the free tip

ReferenceCurved

Shell

Standard

Shell

Curved Plate Cooling Problem



BEAM188 with Cubic shape F/n

Allow cubic shape function used for

interpolating displacements & rotations

Implemented through internal nodes

Benefits

Higher accuracy for coarse mesh

A single element can be used for

modeling beam members

Allows for more general loading pattern

Facilitate interaction with load estimation

codes such as ANSYS/AQWA

Applications

Beam/truss like Civil structures

Off-Shore industry

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Picture from http://www.mms.gov/tarprojectcategories/structur.htm

Off-Shore Structures



3D discrete Reinforcement: REINF264

Reinforcing fibers modeled with

embedded reinforcing elements

Fibers can be oriented arbitrarily

Reinforcement can account for a variety

of nonlinear behavior

Benefits

Explicit & accurate modeling of

reinforcements

Predict stresses in reinforcements

separately

Allows for “tension-only” treatment

Application

Tire industry, Biomedical devices

Aerospace, Civil engineering

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Discrete Reinforcements


SOLVER TECHNOLOGY


Advances in Solver Technology

2D Rezoning Enhancements

Allow to read in generic mesh from a third

party mesher in rezoning

Allow user to split selected elements to

refine mesh in rezoning

Automatically create transition region

meshes

Benefits

Provides flexibility in remeshing

Solve problems otherwise can not be

solved

Application

Any large deformation analyses

Forming and rubber sealing simulation

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Sealing Applications



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CP

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Number of Modes

Block Lanczos

Supernode

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Single Xeon 3.4 GHz processor

►17+ hours reduced to ~1 hour

►7 TB of I/O reduced to <300 GB

New SNODE Solver for Modal Analysis

Splits FE matrix in to smaller pieces –

SuperNodes

Solves reduced Eigen-value problem

Transforms eigenvectors back to the

original FE domain

Benefits

Ideal for > 3 mil. DOFs , >500 modes

Non-iterative – i.e. will not fail to converge

Does not miss modes

Applications

Beam-Shell or thin geometries

Automotive, Aerospace

High frequency response analysis, etc.



Many Misc. Solver Improvements

VT applied to Complex Eigen solver:

Frequency Derivative Algorithm used

DSPARSE solver supports unsymmetric

matrices

Benefits/Applications

Significant improvement in solve speed

Better performance for large number of

contact pairs & constraints

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Solu

tion t

ime

0

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6000

7000

8000

9000

10000

Elapsed CPU

Lanczos

FD



DANSYS Improvements

Support HF-EMag calculations

PSTRESS, PSOLVE support

Cyclic Symmetry support

Benefits

More problems can take advantage of

Parallel solvers

Scalability of solves improved by 10-20 %

Applications

Problems involving stress stiffening

Rotardynamics problems

EMAG problems

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CPUs Time (hr)

1 36.7

2 22.3

4 14.5

8 8.4

MachineWin x64

CCS

Problem

Size

480K

DOF

Bolted Joints, N/L

Contact, Thermal loads

Unsymmetric option

Representative Geometry


DANSYS: Benchmarks on Win CCS

0

1

2

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1 2 4 8 12 16

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ee

du

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Number of Processors

DANSYS Revised Benchmark Set SpeedupsIntel Cluster Ready, 4 nodes 3 Ghz dual cores, 16 Gb, TCP interconnect

Universal Joint 400k DOF Small DSP sparse

Gas-Struct 1M DOF Thermal JCG

Carrier Model 2 M DOF PCG msave,on

Block Assembly 5M DOF Large PCG msave,on

Wing Model 1M DOF Lanpcg 10 Modes

Wing Model 5M DOF PCG msave,off


CONTACT MODELING


Advances in Contact Modeling

Fluid Pressure Penetration Support

Model fluid penetrating 2 contact surfaces

2D/3D surface-to-surface contact pair

Small and large sliding contact

Rigid-flexible and flexible-flexible contact

Usage

Pressure applied normal to contact &

target elements

Can be cut off when contact is restored or

contact pressure is larger than the fluid

pressure

Applications

Post-Leakage simulation

Sealing performance evaluation

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Fluid pressure is applied

Fluid pressure is Not applied

Seals



Contact Performance Enhancements

New Contact search algorithm

Smart over-constraint elimination & display

New Contact pair trimming logic

Solver files size reduced by 50%

Benefits

Speed improved by 1x-200x

Computation time reduced

Less Disk I/O observed

Applications

Most problems involving contacts should

observe speed improvements

Problems involving bonded MPC contacts

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Contact Speed-up Example

BOOTSEAL 3D

Elem: 11090

Nodes: 5040

Dofs: 30240

Rigid-Deformable +Self

Contact

11.0 12.0 speedup

Contact database 11.72 0.216 54.26

Contact Search 3465.04 75.64 45.80

Contact Elements 505.64 188.95 2.67

Other Elements 4907.18 2301.7 2.13

Eq. Solver 276.77 211.35 1.30

Total CPU 9154.65 2777.64 3.29

Elapsed Time 9207 2788 3.30

No. of Iterations 246 240 1.02

No. of Substeps 42 43 0.97

Boot Seal



Friction Definition Improvements

Tabular data for μ with up to 2 fields, eg.

Velocity, pressure, frequency etc.

USERFRIC : A general API for user-defined

friction definitions

Benefits

Account for complex friction behavior

Support friction definitions that do not follow

Coulombs law of friction

Applications

Wear or bearing analysis

Pipeline on a sea bed

Brake Squeal analysis

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LINEAR DYNAMICS


Advances in Linear Dynamics

Rotordynamics Improvements

Gyroscopic effect for shells and 2D

planar elements

Rotating damping to model hysteretic

damping in material

Benefits

Versatility in modeling rotating shell and

3D axi-symmetric structures.

Rotating damping model enables rotor

instability predictions.

Applications

Aero gas turbine engines.

Electrical motors, pumps, etc

Computer disk drives

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PSD (random vibration) Enhancements

Increased # of input PSD points - no

longer limited to 50.

Improved performance of mode

combination in spectrum analysis.

Number of modes that can be combined

increased from 1,000 to 10,000

Benefits

Usability of random vibration features.

Performance improved

Applications

Structures subject to random vibration

such as aircrafts, automobiles, et al.

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Boundary Conditions and Loading

Improvements to PSD Analysis

Base excitation: Individual or ALL

Goodness of fit for PSD data

Response PSD Results available

Applications

Predict Dynamic response of a structure

seismic loading

Loading due to Ground transport

Machine operation

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Response PSD Result



Spectrum Analysis Improvements

Missing Mass and Rigid response

method supported

Residual vector method extended to

Spectrum analysis

Benefits

Accurate representation of higher

frequency content on structural response.

Missing Mass method meets NRC

requirements

Applications

Random vibration response prediction on

airborne structures, nuclear reactors, et

al.

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Courtesy: NASA


Spectrum Analysis in WB

Response Spectrum Analysis

Singe-Point and Multi-Point spectrum

Excitation applied at fixed DOFs

Results: Max response spectrum

Benefits

A Deterministic option for Shock analysis

Very easy to setup

Mode combinations: SRSS, CQC, ROSE

Applications

Seismic response of a structure

Shock and Vibration analysis Str

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Courtesy: U.S. Geological Survey

Graphics Card



Harmonic Analysis Enhanced

Cyclic Symmetry now supports Harmonic

Analysis.

Variational Technology (VT cyclic) based

modal cyclic solve approach

Benefits

Vibration response of cyclic structures

subject to harmonic excitation.

VT cyclic gets 3 – 4 X speed up of modal

cyclic solution.

Applications

Aero gas turbine engine design, electric

motor / generator design

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Elapsed (sec)Ratio

Standard VT

Win32 2905 533 ~ 5.5

Linux 64 1281 406 ~ 3.2

Modal Cyclic Symmetry



Modal Superposition Enhancements

Harmonic & Transient performance

improved, Results expansion pass

Tabular load as a function of frequency

Multiple load vectors supported for Mode

Sup. Harmonic & Transient

Benefits

Ability to solve very large models.

Ease of applying frequency dependent

loading.

Improved usability of MSUP methods in

ANSYS and ANSYS WB environment.

Applications

Very large structures, for example, in

nuclear industry, space applications etc.

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No. of equations 2408595

No. of Modes 21

Analysis PSD

No. of Threads 2

Circuit Board

11.0SP1 12.0

CP (hr) ~ 14.4 ~ 4.4

Elapsed

(hr)~ 12.35 ~ 3



PSOLVE Method for Brake Squeal

Linear QR Damped Modal Analysis with

PSOLVE

Improved performance of QR damp

Eigensolver.

Contact element enhancements for

sliding friction modeling

Benefits

Significantly faster problem setup due to

the flexibility of contact modeling

Taking advantage of advanced contact

capabilities to model „brake squeal‟

Applications

Instability prediction in automotive and

aircraft landing gear brakes.

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Brake Assembly



New Result Item for Linear Dynamics

Modal Assurance criterion calculated

(RSTMAC command)

The nodes need not to be identical

Benefits

Compare results between 2 different

models

Study the effect of design changes on a

machine component.

Applications

Mis-tuning of gas turbine blades

Validate new component designsStr

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file1.rst file2.rst

Match geometries

Calculate Modal

Assurance

Criterion

Match

Solutions


Example: Modal Assurance Criterion

Initial Design New Blade DesignPart


MATERIALS TECHNOLOGY


New Material Models Added

Rate Dependent Chaboche Plasticity Model

Based on Chaboche Nonlinear Kinematic

Hardening model

Plastic Strain Rate-dependent effects

Captures cyclic hardening & softening

Applications/Benefits

Applicable for turbine and engine design

Simulation of Ratcheting and Shakedown

Strain rate dependent applications: for ex.

Impact simulations

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-3.E+08

-2.E+08

-1.E+08

0.E+00

1.E+08

2.E+08

3.E+08

-0.015 -0.010 -0.005 0.000 0.005 0.010 0.015

Str

ess

Displacement



Improved Extended Drucker-Prager model

Include creep effect for all options except

CAP option

Capture strain rate effect of a geological

material


Analyze geological materials that exhibit

pressure dependency such as sand, soil,

ceramics etc.

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Ocean

Structure



New Bergström-Boyce Model

Combines Hyperelastic & Viscoplastic effects

The model decomposes the mechanics

response of material into two distinct

networks: A: time-independent B: time-

dependent.


Accurately capture material behavior under

various loading conditions

Model hysteretic behavior of Elastomers

under large strain deformation

Simulation of Polymers, Elastomers, Plastics,

Bio-tissues which are strain-rate dependent

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Bio -Tissues

Keyboard



New Elastomer Damage Model

Based on Ogden-Roxburgh model

A continuum damage model for rubber

like material

Isotropic damage assumption


Captures cyclic softening of elastomers

Simulation of Mullins effects

Applicable to rubber like materials such

as polymers, elastomers, plastics and

etc.

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Reaction Forces soften

with the 2nd load cycle



Anands Viscoplasticity Model

Implemented for current generation

elements

Unified viscoplastic constitutive model

Includes an internal state variable - the

deformation resistance

No yield surface

Benefits & Applications

Highly nonlinear large deformation

problems

High temperature metal forming

simulations

Electronic Packaging, Solder joint

simulation

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Metal Forming Applications


Fracture Mechanics Improved

Enhancements to J-integral Calculations

Thermal strain is automatically included

in the J-Integral calculation

Surface pressure load on element

surfaces or edges is automatically

included in the J-Integral calculation


Provide accurate estimation of J-Integral

when there are thermal strain and surface

pressure on crack faces

Structural integrity assessments

Nuclear reactor safety analysis

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Spot Weld

Failure Analysis


Example: Turbine Blade Crack

Analysis

PRCINT prints calculated

J-Integral values to

Solution Information

Window

Penny Crack


Fracture Mechanics Improved

Mixed Mode Stress Intensity Factors

Based of Interaction integral approach

by Gosz and Moran

Minimum input

Crack front/tip nodes

Crack plane normal or extension

direction

Number of contours

Benefits

Much easier to use

Improved accuracy observed

Applications

Mixed mode stress intensity factor

calculation , Safety analyses

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Stress Intensity

Factor calculation


Advanced Analysis Functions

Improvements in Initial State

Support Initial strains

Support Plastic stress and strain


Analysis of residual stress/strain

Analysis of Weldment with residual stress

Transfer state of a 2D analysis to 3D

Start in 2D and continue analysis in 3D

Pre-stressed modal, Transient type

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RIGID AND FLEXIBLE

DYNAMICS


Rigid Dynamics

Bushing Joint

►Free motion in some directions,

constrained in others

►Elastic and damping forces in

constrained directions

Benefits

►Add flexibility at joints w/o large

CPU cost

►Add realism to rigid simulations

Applications

►Suspensions

►Pivots with compliance

►Vibration isolation

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Rigid Dynamics

Stops and Locks

►All Translational DOF‟s

►Single rotational axis joints

Benefits

►Simplifies mechanism modeling

►Much requested feature

►Faster than modeling contact

Applications

►Travel limiters

►Non-moving impact points

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Rigid Dynamics

Remote Loads

►Remote displacements

►Remote forces now supported

Benefits

►Much requested feature

►Allows load input w/o requiring

geometry

Applications

►Partial assembly modeling

► Inverse Dynamics

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Rigid Dynamics

Spring Preload

►Specify free spring length

►Specify preload

Benefits

►More realistic modeling of

spring mechanisms

Applications

►Valve trains,

►Plungers,

►Solenoids

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Rigid Dynamics

Load Data Fitting

►Complex load input

►Multi-channels

►Piecewise linear tables added

Benefits

►Fitting not required

►Time savings on complex load

input

Applications

►Equipment durability testing

►Seismic loading

►Shipping loading

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Rigid Dynamics

Redundancy Analysis and Repair

►Troubleshooting tool

►Common problem with mechanism

models

Benefits

►Points out over constrained joints

►Allows selective unconstraining

►Help prevent problems going from

Rigid to Flex

Applications

►All but the very simplest

mechanisms

►All models that will be solved in flex

dynamics

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Rigid Dynamics

Solver Updates

►Runge Kutta 5

►RSM

Benefits

►RK5 faster for most problems

►Remote Solver offloads solve to

server

Applications

►All but the very simplest

mechanisms

►Longer running rigid dynamics

simulations

►Complex load/time history problems

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Rigid Dynamics

Load Export

►Rigid Dynamics solve

►Forces and moments are loads for

static structural analysis

►User selectable time point(s)

Benefits

►High degree of user control

►Less CPU than full flexible dynamics

solution at all time points

Applications

►Rapid what-if studies

►First order simulation modeling

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Flexible Dynamics

Component Modal Synthesis

►Uses substructuring approach

►Standard command objects

►Requires linear materials

►Large rotation/translation

Benefits

►Potentially huge time savings

►CMS for linear parts or model,

flex for others

Applications

►Mechanisms and machines with

linear materials

►Non-contact dominated parts of

assembly

Fle

xib

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Rigid

Dynamics

Flexible

Dynamics

Rigid

Parts

Flexible

Dynamics

Full Mesh

Flexible

Dynamics

CMS

Flexible

Dynamics

CMS

Flexible

Dynamics

Full Mesh

Total # DOF 7 60 ~75k ~75k ~1 mill ~1 mill

Total Iterations 625 2520 2297 830 1015 ???

Time for Gen N/A N/A N/A 27 s 24 min N/A

Time for Use N/A N/A N/A 25 s 1 min N/A

Time for Exp N/A N/A N/A - - N/A

Total Time 1 s 60 s 217 min 52 s 25 min Too long!


WORKBENCH INTERFACE


Preprocessing in WB

Shell and Beam Modeling Improved

Element Order support for 2D, Shells and

Beams

Shell offset: Top, Middle, Bottom or user

Beam offset: Centroid, Shear Center,

Origin or user defined

Benefits

More accurate representation of curved

shell or beams

Accurate modeling of assemblies

involving shell, beam and solid elements

Applications

Automotive, Aerospace, Pressure vessels

All models involving plates and trusses

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Shell and

Beam offsets


Preprocessing in WB

Gasket Element Support

More automated thin model meshing

Higher order on the faces and lower order

on the sides

Benefits

Contact definitions automatically handled

Multi-body part gasket meshing

Material definitions using command

snippets

Applications

Simulation of Gaskets used in

Engines

Compressors

Heat exchangers etc,

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Gasket Element Supported


Example: Solid-Shell Meshing

Courtesy Parametric Technology Corporation

Solid-Shell Mesh

Multiple Elements

Through Thickness



Spatially Varying Load

Spatial variation along one coordinate

direction

Load as a Table or function

Pressure or temperature

Benefits

Visualize Loads which vary with respect

to position

Loads can be imported from 3rd party

applications

Applications

Aerospace, Automotive applications

Turbo machinery related problems

Hydrodynamic loading

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Pressure Varying Load



New Boundary Conditions Support

Coupling of two or more faces

Cylindrical coordinates for Displacement

Directional Control for Fixed Rotation

Applications

Use Coupling to model various joint/hinges

Apply rotation as an applied displacement

For 2D modeling, more granular control for

rotations

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Coupling Constraint

Fixed Rotation,

Cylindrical Coordinates



New Remote Point Feature

Scoping mechanism for remote B.C.‟s

Applied to face, edge, vertex of bodies

Promote Remote B.C.‟s to a remote point

Benefits

Multiple boundary conditions scoped to a

point

Avoid over constraint conditions

Applications

For 2D and 3D modeling of structures

Point Mass, Springs, Joints, Remote

Loads, Moments

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Remote Points



Contact for Surface Bodies

Applicable to contact with Surface bodies

Specify Contact or Target to a shell face

Applied on Top or Bottom shell face

Benefits

At v12.0 full contact features support for

shell models

Contact conditions supported on either

side of a surface body

Applications

Assembly model of thin structures

Shell and Solid assemblies

All industries

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Shell-Shell Contact


Post Processing Enhancements

Custom Post Processing

Full range of .RST results exposed in WB

Accessed through the Worksheet view

Details view enables expressions

Benefits

Post advanced MISC data from .RST file

Math Operations on results sets

Linearized Stress results for Shells

Applications

Post advanced results from - .rst, .rth files

Calculate custom values from any

predefined result set

Check for compliance with various codes

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Acoustics Post in WB

Fluid30 Element

Linearized Stress Plot


Post Processing Enhancements

Advanced Post Processing Features

Post results of complex modes

View results along a slice with Path plots

Review unaveraged contour plots

Results in Solution coordinate system

Post results during a solve

Benefits

Plot results along a load or stress path

Orient results in a user coordinate system

Monitor results during a solve

Applications

Plot temperature as a function of distance

More intuitive knowledge into the

behavior of a nonlinear solution

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Path Plot

Unaveraged Stress Plot


Example: PostProcessing of Complex

Results

Unstable Mode

Damped Mode


ANSYS 12.0 Summary

• Continued Innovation in Element

Technology

• Additional Productivity with Native

Workbench Features

• Committed to Advanced Solver

Performance

• New Framework for Multiphysics

Simulations


THANK YOU

[email protected]

ANSYS 12.0 Update Structural Mechanics

Documents

Transcript of ANSYS 12.0 Update Structural Mechanics