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This page covers

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follow-on

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exercises

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to

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the

...

bike

...

crank

...

tutorial

...

.

...

In

...

particular,

...

it

...

shows

...

how

...

to

...

add

...

a

...

strain

...

gage

...

to

...

the

...

ANSYS

...

model

...

to

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predict

...

the

...

strain

...

that

...

would

...

be

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measured

...

by

...

a

...

gage

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mounted

...

on

...

the

...

crank

...

model.

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Strain

...

Gage

...

Modeling

...

The

...

following

...

video

...

shows

...

how

...

to

...

add

...

a

...

surface

...

to

...

the

...

crank

...

model

...

to

...

find

...

the

...

average

...

strain

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over

...

the

...

area

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covered

...

by

...

a

...

strain

...

gauge

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mounted

...

on

...

the

...

crank.

...

The

...

video

...

includes

...

audio

...

as

...

do

...

other

...

videos

...

on

...

this

...

page.

...

Note

...

that

...

you

...

have

...

to

...

make

...

the

...

following

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modifications

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to

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the

...

procedure

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shown

...

in

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the

...

video:

...

  • Using

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  • "Automatic

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  • Connections"

...

  • to

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  • connect

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  • the

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  • crank

...

  • arm

...

  • and

...

  • the

...

  • gage

...

  • doesn't

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  • always

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  • work.

...

  • An

...

  • alternate

...

  • procedure

...

  • to

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  • manually

...

  • connect

...

  • the

...

  • two

...

  • entities

...

  • is

...

  • shown

...

  • in

...

  • a

...

  • later

...

  • video

...

  • below.

...

  • When

...

  • specifying

...

  • the

...

  • edge

...

  • sizing

...

  • for

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  • the

...

  • gage,

...

  • set

...

  • Behavior=Hard

...

  • as

...

  • in

...

  • the

...

  • snapshot

...

  • below.

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  • Otherwise,

...

  • ANSYS

...

  • might

...

  • over-ride

...

  • your

...

  • edge

...

  • setting

...

  • and

...

  • you

...

  • will

...

  • get

...

  • more

...

  • than

...

  • one

...

  • element.

    Image Added


    HTML
    <iframe width="600" height="338" src="//www.youtube.com/embed/94o6t-LCzl4?rel=0" frameborder="0" allowfullscreen></iframe>

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  • An overview of the procedure followed in the video and explanation of the associated steps can be found in this powerpoint presentation from MAE 3272, Spring 2013.

    Our ANSYS Mechanical 14.0 model with a strain gage mounted can be downloaded here for your review. Download the .wbpz file and double-click on it to load it in ANSYS Workbench. To save the file in the usual .wbpj format, select File > Save as. To reduce the file size, the results have not been saved. You'll have to clear all results by selecting (right-click)Results

...

  • >

...

  • Clear

...

  • Generated

...

  • Data

...

  • in

...

  • the

...

  • project

...

  • page.

...

  • Then,

...

  • re-solve

...

  • in

...

  • ANSYS

...

  • Mechanical

...

  • (the

...

  • red

...

  • M

...

  • in

...

  • the

...

  • taskbar)

...

  • to

...

  • see

...

Manually Connecting Crank Arm and Gage

The above video shows how to add a connection between the crank arm and the gage using Create Automatic Connections. But this automated procedure doesn't always work. In that case, one has to connect the two entities manually using Insert > Manual Contact Region as shown in the video below.


HTML
 results.
\\
\\  [!clear_results.png|width=350!|^clear_results.png]\\
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h3. Manually Connecting Crank Arm and Gage

The above video shows how to add a connection between the crank arm and the gage using {color:#660099}{*}{_}Create Automatic Connections{_}{*}{color}. But this automated procedure doesn't always work. In that case, one has to connect the two entities manually using {color:#660099}{*}{_}Insert > Manual Contact Region{_}{*}{color} as shown in the video below.

\\
{html}<iframe width="600" height="338" src="//www.youtube.com/embed/KhyN1puzSY0?rel=0" frameborder="0" allowfullscreen></iframe>{html}
\\

h3. Meshing with Hexahedrals using the 


Meshing with Hexahedrals using the Multi-Zone

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Method

...

The

...

multi-zone

...

method

...

in

...

ANSYS

...

  • Gives

...

  • hexahedral

...

  • or

...

  • box

...

  • elements

...

  • for

...

  • certain

...

  • geometries

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  • Chops

...

  • up

...

  • the

...

  • domain

...

  • into

...

  • regions

...

  • which

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  • can

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  • be

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  • "hex-meshed".

...

  • These

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  • regions

...

  • often

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  • have

...

  • a

...

  • shape

...

  • that

...

  • can

...

  • be

...

  • created

...

  • though

...

  • extrusion

...

  • The

...

  • default

...

  • meshing

...

  • method

...

  • often

...

  • gives

...

  • a

...

  • tetrahedral

...

  • mesh

...

  • which

...

  • has

...

  • lower

...

  • accuracy

...

  • than

...

  • a

...

  • hex

...

  • mesh

...

  • for

...

  • the

...

  • same

...

  • number

...

  • of

...

  • nodes.

...

  • The

...

  • advantage

...

  • of

...

  • tetrahedrals

...

  • is

...

  • that

...

  • you

...

  • can

...

  • mesh

...

  • any

...

  • general

...

  • geometry

...

  • while

...

  • pure

...

  • hex

...

  • meshes

...

  • can

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  • be

...

  • created

...

  • only

...

  • for

...

  • some

...

  • geometries.

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The

...

steps

...

for

...

using

...

the

...

multi-zone

...

meshing

...

method

...

for

...

the

...

bike

...

crank

...

geometry

...

are

...

shown

...

in

...

the

...

video

...

below.

HTML

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{html}<iframe width="600" height="338" src="//www.youtube.com/embed/vmVwnsO53yo?rel=0" frameborder="0" allowfullscreen></iframe>{html}
\\

h3. Creating a New Coordinate System in ANSYS Mechanical

If your default coordinate system is not centered on one of the holes in the crank, or you wish to learn how to define new coordinate systems inside the mechanical window, please refer to the following video:
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{html}


Creating a New Coordinate System in ANSYS Mechanical

If your default coordinate system is not centered on one of the holes in the crank, or you wish to learn how to define new coordinate systems inside the mechanical window, please refer to the following video:

HTML
<iframe width="600" height="338" src="//www.youtube.com/embed/gWJlPBX3C_Y?rel=0" frameborder="0" allowfullscreen></iframe>{html}

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h1. Comments

\\
{include: Accessing Piazza Discussion Paragraph}
\\  {menulink:custom|link=https://piazza.com/class/hj629p862t37jm?cid=23|target=_blank}{*}Piazza Discussion - Bike Crank (Part 2)*{menulink}

\\

{include:Piazza Enrollment Paragraph}
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