FEA Analysis - Handout

8/10/2019 FEA Analysis - Handout

http://slidepdf.com/reader/full/fea-analysis-handout 1/17

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CantileverBeam

Example

Obiectives:

- To performahandcalculationusingprinciplescoveredunderDESIGNFOR

RIGIDITY lecture

-

To demonstratehat a

CAD model S NOT

an FEA Model

Hand Calculation:

a) Deflection

Considera cantilever

beamwith rhe ollowing

dimensions

and

properties:

Lengft= 2*

D€pth= 100rnm

Width= 50mm

Load=10000N

Youag's modulus=200GPa

=

200 10eN/rnm2

Expression or deflection

rom handout:

.

W/E

3EI

,

oa'

12

Rearranging

Plugging n numbersd

=

4*10000*8

200 10,

50*t0r

*

(100)3

104

Recall heexpression

or beam ending

4

=

9

Iy

Annl ied mnmanr= F*T

I definedas above

d

'2

t2*F*L*d

b) Stess

Rearranging

or stressd

=

Plugging

n numbers

=

6

=

32*10-t tk

=

32mm

z-r^- : l ' --- '

o= 3L166'

\

2* b* dj

6,4 ,*

L

b* d'1

6

*

10000'r

50'r0-r

*000),

*

10-6

=

240MPa

i];q'";.J

=

240*106

/n'z



FEA Aualvsis

usins a

CAD mo 91

Create

block 50

by

100by 2000)

Define

a solid

brick element

Enter

matedal

properties

asE=200000

nd

v=0.3

Seedhe nesh s 0 by I by.1

2

lte1,^tr

r.",..n,=.,tt?..\.^-t:.>..>,-ze-c.f,.ts_->,

'vresn

le

vorume

) mapped

eslxng

-

v..

",1

,.

-

_

.

(.

.

.

.

Apply

he

boundary

onditions

y fixing

he back

ace n

all DOF,,

_

-,

tr;

;1...1

"

l,

-,',

"

"

"

,

Apply

the oad

asFy

of-2500 at

the 4 kelpoints

on ihe

opposite

ace

Solve

he cunent

oad

step

Look at

the results:

First

the deformed

bape

nd

note he

deflection

Second

ontour

he

stressll the

x direction

and

note

he

ma,rimum

value

ANY

COMMENTS???

FEA

Anilysis

using

a

proper

FE model:

Creale

suajght

ine

by 2 kelToinrs

Define

a beam

elemelt

Define

the associated

eal

constants

y

enterarea

as 50* 100

moment

f area

s

50'r100*'t3)/12

depth

s 100

Seedhe

meshas

10elements

long

he ine

Mesh he ine

Apply

the

bormdary

onditions

by fixing

one

endpoint

ofthe line

itr

all DOF's

Apply

the oad

asFy

of-I0000

at he

otherendpoint

fthe

lire

Solve

he curent

load

step

Look at the results: First thedeformed hape nd

note

he deflection

Secondook

up the

stess data

To peform

the ast

operation, ou

need

o use:

Element

able>Defi

e

able>Add

Under

Lab box,

enter

endings

nd l?e

ls,3under

election

CloseElement

able

data

window

List elem

ableand

click

onbendings

Note

he

esults

ANY

COMMENTS???



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Dealing

with

Unitsand

Powers

of 10

l) Expresshe ollowing n

terms fpowers

often:

a) 100 00

b) 10000000

c) 0.01

d) 0.0001

e) 1/1000

D

100/0.001

2) Perfomr he following

operations nd

expresshe final

resultsas

powers

of

ten:

a) 10/10

b) 10000/10

c) 10/10 00

d) 0.0^1n00

f ) 10r*105

s)

1oj/1oj

:.

-

^-a. - ^ ,

n) lu_

tuo

i) 10110'

3) lfthe basicunits

ofmass, englh nd ime

arekg, m ands respectively,

xpress

theunitsofthese

ollowing ariablesn terms

ofthesebasic

units:

a) Volume

b) Velocity

defined sdisplacement

er

unit ime

c) Acceleration

efined schange fvelociq'per

unit time

d) Delsity defined

smass

er

unitvolume

e) Area

0

Displacement

g)

Stair definedas change

n length

per

r.mit

ength

h) Forcedefined

smassimesacceleration

4)

Given hat:

I Gigaunits

=

10' units

I Megaunits

106 nits

1 kilo units

=

103

nits

I milli unit

=

10'3

uir

I microunit

10-6 nit

Sortout he ollowingaspowers

ften:

a) lMega/ IGiga

b) 1 Giga/ Mega

c) 1mi l l i / lmicro

d) lmicro/1mi l l i

e)

1 milli /1 kilo



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micro

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often.

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cren(tsts

r engineers.

xpress

hem

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nils

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defined

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massimes

acceleration

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Pascal_@a)

s

a unit

of stress

r

pressure

efined

as force per

unit

area

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defrned

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imes

distance

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as

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defined

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defined

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Ansys

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Page

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homerphotosrcontact

Many

ppl get

into infr

problems

white nstalling

nsys.

So his

page

hopes

o

resolve

he

difficulties.

The normal

way

First

of

all,

read

he instal'.txt

supplied

'n

the crackdirectory

carefulty.

i .

lpen

r:hc

c.ack d-Lrectort '

and

edit the ansr-:r.

iat f i la_

Changshosi

i :o

your

ccnp.:ier Lane

rnd a0,.C0a01.Ij tt

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: /our

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hostr id and

save Lh. f i l .e.

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r t re

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a

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Main Fage

Cobing

Myvideos

-,

..

Meeting

ith Ron ,...

Timeline

Links

How

am

getting

ast

Computer

i4y Photosystem

Shoutbox

YahooExtractor

Ansys nstaltation

ips

LazyBums

aim

plugin

Reverse Engineering

Photos

Acknowledgernents

Contact

Hopefully

ou

should

be able o understand

t. To

set the environment

afiable, ight

click .4y

omputer and

goto

properties.

nside

t

goto

the Advanced

ab and at

the bottom s

the Environment ariables

utton.Create

the variable

here.

lnstall

he flexlm icense

manager

and when t asks

u to show he location

of the

license

ile,

point

o this.

Then t might

ask u

again,

saying

his

is

old and what

not,

so

ust

copy

he

ljcense,dat

ile

to someother

location

and try again.

If

every

hing

goes

ine,

ur server

shouldbe startednow.

Runansys

and check. f it

dosent

hen

goto

the next

siep )

Manually

configuring

the seryer

This method

s extremely

wierd

and

ifound

it by much rustration,

but it works

everytimel

.

To

get

it

going,

createa new

directory n

C: by the name lexlm



Page2

f2

Copy

he

license.dat

ile

to this directory,

viz

C:Vlextm

Open

command

prompt(Staft->

Run-

>cmd

and

enter this

path

i :

\ : r ' rgrarr

f i

le. i \F-nsi ;s

i ; rc\Sh3rr :d

r i . i tes\ t i . r .nsi rg\ intrei \ t rqr i i .exe

7

Press

nter

and

ur servef shoulcl

tart runningr

Notei

you

may

have

o change

he

path

according

o

your

installation,

n

99olo

f the cases ts

the above

path.

f

you

get

a "bad

command

or file name',

error

then search

on

your

computer

or Imgfd.exe

and

give

the appropriate

ath.

Ur

welcome

:)

Say hanks

f atworksl

home I l inks

top

I

Sa.hin

Shi.w.lkfi

spdated

26 Nov-2006



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FEA Analysis - Handout

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