142209183 ANSYS 14 Structural Mechanics Update

7/28/2019 142209183 ANSYS 14 Structural Mechanics Update

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© 2011 ANSYS, Inc. November 22,

2011

1

Improving Your Structural

Mechanics Simulations withRelease 14.0




2011

5

Structural Mechanics Themes

MAPDL/WB Integration

Physics coupling

Rotating machines

Composites & Fracture Mechanics

Application Customization

Thin structures modeling

Contact analysis

Performance

Advanced Modeling

Geometry Handling

Listening to your

needs, we have

been able to identify

a number of themes

which form the basis

of our roadmap andguide our

developments




2011

6

What will Release 14.0 bring you?




2011

7

Let’s now take a closer look at some topics




2011

8


Finite Element Information Access withinANSYS Mechanical


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2011

10

Spot Welds

Connections created

internally at thesolution level are

available and can help

understand the results

Reviewing Connections

Weak springs and MPC contacts

as generated by the solver



2011

11

Nodes can be grouped

into named selections

based on selection logic,

using locations or other

characteristics – or

manual selections

Selections of Nodes

Box Selection Node Picking Lasso Selection



2011

12

Applying Loads and Orientations to Nodes

“Nodal orientation”

allows users to orient

nodes in an arbitrarycoordinate system.

Direct FE loads and

boundary conditions can

be applied to selectionsof nodes.

Nodes are oriented in cylindrical system for loads and

boundary condition definitions



2011

13

Results on Node Selections

Results are displayed on

elements for which allnodes are selected.

Nodes named selections

allow to scope on specific

regions of the mesh orremove undesired areas.

Results with first layer of

quads removed

Results on quads layers only




2011

14

Restart and Direct FE Loads

Nodal Forces and Pressures objects can

be added to a restart analysis without

causing the restart points to becomeinvalid.

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 stepmodified for restart




2011

15


Linear Dynamics in ANSYS Mechanical




2011

16

Workbench and Mechanical enhancements

→MSUP Transient

Analysis supported

→Joint feature can now

be used in Harmonics,Random vibration

analysis

→Reaction Force &

Moment results is nowsupported

Modal Superposition Transient

Joints in Harmonic

Analyses

Reaction Forces in a

Harmonic Analyses




2011

17

Physics Coupling

Data Mapping




2011

18

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, nonmatching units or scaling

issues.




2011

19

Supported Data Types

New at R14.0




2011

20

Increased Accuracy

The smoothness of the

mapped data depends on

the density of the point

cloud.

Several weightingoptions are available to

accommodate various

data quality.

Triangulation versus Kriging




2011

21

Validating the Mapped Data

Visual tools havebeen implemented to

control how well thedata has beenmapped onto thetarget structure




2011

22

Importing Multiple Files

Multiple files can be

imported for

transient analyses or

to handle different

data to be mapped

on multiple bodies




2011

23

Rotating Machines

Studying Rotordynamics in ANSYS Mechanical




2011

24

Motivation

ANSYS Mechanical users

need to be able to quickly

create shaft geometries

as well as analyzedynamic characteristics

of rotating systems

Industrial fan (Venti Oelde)




2011

25

Geometry Creation

Geometries can be

imported from a CAD

system or imported

from a simple text

file definition as used

in preliminary design




2011

27

Specific Solver Settings

Rotordynamics

analyses require a

number of advanced

controls:

→Damping

→Solver choice

→Coriolis effect




2011

28

Campbell Diagrams

Campbell diagrams

are used to identify

critical speeds of a

rotating shaft for a

given range of shaft

velocities




2011

29

Composites

Enhanced Analysis Workflow and AdvancedFailure Models for Composites




2011

30

Motivation

Efficient workflows

and in-depth analysis

tools are required to

model and

understand complex

composites structures




2011

31

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)




2011

32

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




2011

33

Defining Layers on Complex Geometries

For complex

geometries, the ANSYSComposite PrepPost

tool is used and layer

definitions are imported

in the assembly modelin ANSYS Mechanical.

Courtesy of

TU Chemnitz

and GHOST

Bikes GmbH




2011

35

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)




2011

37

Motivation

Many of you have

expressed the need for:

→Computing and

displaying specific

results→Be able to achieve

more complex “User

defined results”




2011

38

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




2011

40

Design Assessment for Advanced “User DefinedResults”

Design Assessment enable

users to extend user defined

results capabilities with:

→Expressions using

mathematical operators assupported 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




2011

41

Thin Structures

Mesh Connections




2011

42

Motivation

In order to connect

meshes of different

surface parts so as to

merge nodes at

intersections, users do notalways want or cannot

merge the topologies at

the geometry level.

Mesh based connectionsare required.




2011

46

Virtual Topologies Interactive Editing

Virtual topologies arehandled more

interactively through

direct graphics

interaction rather than

tree objects.User selects entities then

applies VT operations

Direct access to

operations from

RMB menu




2011

48

Virtual Topologies Applications

Get swept mesh on

non-sweepable

bodies

Improve shell mesh quality

and orthogonality with VT

combinations




2011

49

Contact Analysis

Rigid Body Dynamics




2011

50

Motivation

Many mechanisms andassemblies have

components that

operate through

contact.

In order to maintain the

rapid turnaround for

RBD simulations, there

has been a subsequentfocus on improving

speed, accuracy and

reliability of the contact

capability.




2011

51

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 beenimproved for speed

and accuracy –

expect a typical 2-5x

speed-upTransition and “jump”

prediction have been greatly

improved




2011

52

Contact Analysis

Flexible bodies




2011

53

Motivation

While already providing

leading edge

technology, ANSYScontinues to enhance

its ability to robustly

and efficiently solve

complex contact

problems




2011

55

Contact accuracy and robustness

Contact stabilization

technique dampensrelative motions

between the contact

and target surfaces

for open contact New contact

stabilization prevents

rigid motion

“Adjust to touch” causes

rigid body motion and

leaves a gap




2011

56

Performance

Further benefits from GPU boards




2011

58

Distributed ANSYS Supports GPUs

2.1 MDOF,

Nonlinear

Structural

Analysis usingthe 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




2011

59

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

Mold

PCB

Solder

balls




2011

60

Speed-up from multiple nodes with 1 GPUboard per node

Mold

PCB

Solder

ballsResults Courtesy of MicroConsult Engineering, GmbH

1 node @

8 cores, 1

GPU

2 nodes @

4 cores,

2 GPU

8 nodes@

1 core,

8 GPU




2011

62

Motivation

ANSYS provides acomprehensive library

of advanced materials.

Some users howeverneed even more

advanced models to

include complex

nonlinear phenomena

in their simulations.




2011

63

→Anisotropic Hyperelasticity plus Viscoelasticity 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 BiomechanicalApplications

‘Hydrocephalus’ analysis

Hyperelastic material with porous media

Stent modeling using shape memory alloys

li i l f l d fi ld l




2011

64

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



i i




2011

67

Motivation

The solver techniquesavailable 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.

Ad d li h d




2011

68

Advanced Nonlinear Methods

User can now perform:→Buckling from a

nonlinear prestressed

state with dead loads

(new subspaceeigensolver)

→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

A l i F d L D f i




2011

69

Analyzing Fasteners under Large Deformations

Bolt pretension does notinclude 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

C l d / i i l i




2011

70

Coupled structures/acoustics simulations

Coupled problems aremodeled more

efficiently:

→Quadratic tetrahedral

acoustics elements→New acoustics

sources

→Absorbing areas

→Enhanced PML

formulation

→ Near and far-field

parameters




2011

72

Advanced Modeling

Explicit Analysis



N t t h d l l t




2011

75

New tetrahedral element

The new tetrahedral

element helps quickly

model complex

geometries for low

velocity applications

such as drop tests for

mobile phones or

nuclear equipmentsSelf Piercing Rivet

Fast Solutions Using 2 D Formulations




2011

76

Similarly to implicit

analyses, 2D plain

strain andaxisymmetric

formulations provide

faster computation of

explicit solutions

Fast Solutions Using 2-D Formulations

2D forming

Axisymmetric

bullet model




2011

77

Geometry

Advances for Structural Engineers

Motivation




2011

78

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 toprovide more efficient

tools.

Mid Surfacing Improvements




2011

79

Mid Surfacing Improvements

Selection tolerance is

available to handle face

pairs in case of imperfect offsets.

Body thicknesses can be

displayed on the model.




2011

82

Physics Coupling

System Optimization with Rigid Body Dynamicsand Simplorer co-simulation

Motivation




2011

83

Motivation

Most mechanisms andassemblies are managed

via control systems.

System simulation,

including the details of the mechanism or

assembly, are needed in

order to improve

modeling accuracy,

fidelity and ultimatelysystem optimization.

Linking Mechanical and Simplorer




2011

84

Linking Mechanical and Simplorer

Inputs and outputs are

defined as “pins” in theMechanical model and

connected to the

schematics of Simplorer



Some Examples




2011

86

Some Examples

Aircraft Landing

Gear

Simplorer schematic of

hydraulic circuit and control

RBD model

Robotic Arm Control

Trace of arm

trajectory




2011

87

And there is much more…

check the Release Notes!




2011

88

…check the Release Notes!

Think also of the “Technology Demonstration




2011

89

Think also of the Technology DemonstrationGuide”




2011

90

Questions?




2011

91

Appendix




2011

92

Customization

Application Customization Toolkit

Motivation




2011

93

Motivation

As a Mechanical User,you may want to:

→ Customize menus

→Create new loads and

boundary conditions→Create new types of

plots

→Reuse APDL scripts

without command

snippets

What is the Application Customization Toolkit?



© 2011 ANSYS, Inc. November 22,2011

94

pp

The ApplicationCustomizationToolkit is

a tool that

facilitates customization

of ANSYS Mechanical.

It provides a way to

extend the features

offered by ANSYS

products.



Writing APDL Commands From the New Definition




97

! APDL_script_for_convection.inp

! Input parameters:esel,s,type,,10

cm,component,ELEM

thickness = 1.1

film_coefficient = 120.

temperature = 22.

! Treatment:

/prep7

et,100,152keyop,100,8,2.

et,1001,131

keyo,1001,3,2

sectype,1001,shell

secdata,thickness,10

secoff,mid

cmsel,s,component

emodif,all,type,1001

emodif,all,secnum,1001

type,100esurf

fini

alls

/solu

esel,s,type,,100

nsle

sf,all,conv,film_coefficient,temperature

alls

APDL

WB Mechanical

An Example: ACT driven Submodeling




98

a p e: C d e Sub ode g

Users simply select the

coarse model’s results file,

all APDL commands areautomatically created – nomore need for command

blocks!




99

Advanced Modeling

Offshore Structures

Global Offshore Structures




100

Over the period of the design of an offshore structure –

from Concept through FEED and Detailed Structural and

Equipment Design–

there are needs for many different analyses related to global structural design and integrity and detailed component level analysis. To ensure delivery

timeliness, and reliability where costs of failure are so high,

there is considerable value in compatibility between the

respective tools. This is delivered by the ongoing

integration of ANSYS AQWA in Workbench and delivery of enhanced capabilities in Mechanical/MAPDL for offshorestructures analysis.

Importantly, ANSYS Structural Mechanics products now

deliver the ability to conduct both global and detailed

analysis of offshore structures subjected to various wave

and environmental loadings.

Local joint flexibility analysis

Global hydrodynamics and

structural analyses

Further AQWA Integration in Workbench




101

•

Hydrodynamic Time Response systemenhancements include

– Fenders (similar to contact)

• Allows connections between 2 structures

or between a structure and a fixed point

–Articulations (similar to joints)

Q gfor Multi-Body Wave Hydrodynamics

Offloading arm

represented with series

of typical articulations

Enhanced Environmental Conditions and




102

Cable Behavior in AQWA

• Introduction of multi-directional wave spectra

allows more realistic modelling of real wave

conditions, and is important for the accurate

simulation of moored vessels and offshore

platforms

–Almost any combination of wave spectra tobe modelled in the solver modules LIBRIUM,

DRIFT and the Hydrodynamic Time Response

system in Workbench

• To meet API standard (RP2SK), non-linear axial

stiffness can be used to define a mooring line• Gaussian formulated wave spectrum now

available in the core solver and the

Hydrodynamic Time Response system

Extended Wave Loading in Mechanical




103

• Diffracted wave loading

– Provides simplified pressure loading fromHydrodynamics Diffraction systems (AQWA)

onto MAPDL system

• Harmonic Wave Loading

– Regular wave loading now available for harmonic

response analyses

– ANSYS FATJACK (for beam joint fatigue of framed

structures) automatically reads the RST file data

for harmonic load cases

•ANSYS BEAMCHECK (for member checks on framedstructures) and ANSYS FATJACK now delivered withMechanical installation

– See Design Assessment for further information

gand links to Regulatory Code Checks

Vessel Loading Transfer fromAQWA to Mechanical

Courtesy of Vuyk Engineering Rotterdam

Coupling Mechanical with 3rd Party




104

• Aeroelastic coupling (for wind turbine support

structures)

– Sequential

• Allowing structural (ANSYS) and aeroelastic (3rd

party) analyses to be run independently

• Just use a provided MAPDL macro to write outinput data for the aeroelastic analysis

–Fully coupled• Co-simulation of structural and aeroelastic tools

• Custom build of MAPDL required, with a macro to

manage the data availability from and to MAPDL

p g yAeroelastic Tools for Offshore WindTurbine Modeling

Images Courtesy of REpower Systems AG




105

Advanced Modeling

Brake Squeal

Motivation




106

Brake Squeal is a consistent

customer complaints and is

associated with high warranty

costs.

ANSYS provides the best

solution for such analyses,

including complex Eigen-

Methods to predict onset of

squeal, new state-of-the-art

linear methods andparametric studies.

ANSYS Solution for Brake Squeal



• Complex Eigen solve

• Animate: Complex

Mode Shape• Contact Status at Pads

CADMesh &

ConnectionSetup &solver

PostProcessing

Bi-Directional CAD

Connectivity

• Automated Contact

Detection

• Provides for sliding

contact with friction

• No match mesh needed

• Supports higher order

elements• Automated Meshing

• Flexibility to use Linear

& Non-linear solver

capabilities

• Root locus plots

• Correlation of modes

• List Strain energy per

component per modeFriction sensitivity study

• Physical prototyping time consuming and expensive

• Provide more analysis early in the design cycle

• Parametric Study by changing friction coefficient

• Run set of DOE’s

• Can Include Squeal and

Contact damping

• - Sliding velocity

dependent Friction

142209183 ANSYS 14 Structural Mechanics Update

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