fea_lecture notes

83
SLAN Mfle 2oiS (1) iD ( 2 ) iD .i L f tnc1 - tl 'X-=- 0 i S LA '- 0 ) -v---- Ll (o): l\ o +kt (OY\Shruhv-E.- te1Rh 0 ,1: ()= &L-\ ,-x. -rlt\tS OUY +h.tt.r -1 h ll ow1r:j D (} 1 t - 0 In dx d f K I '( t.! l t\ I : (' "J ll 1 1 r ' r • '(lt 1 ( 1 1 ' 'l'\ '"' 11 C'11•101l\ (; I . , C o) ., \A o f.: t L\(L)=- u 5 -OJZ- cr(!-)=t L OJ W \'vH'\ \Jc on{?. or ·\'At o\ h. .Q v-. (j)

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lecture notes from the Coursera FEA online course

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Page 1: FEA_Lecture Notes

SLAN Mfle 2oiS

i~t~: (1) iD

(2 ) iD

,~I .i L

f tnc1

-tl € 'X-=- 0 i S LA '- 0 ) -v----

Ll (o): l\ o

~ +kt (OY\Shruhv-E.- te1Rh0,1: ()= &L-\ ,-x.

-rlt\tS 1~ OUY

+h.tt.r -1 ~~ h ll ow1r:j

D (} 1 t - 0 In dx d ~ f K I '( t.! l t\ I <c~ : (' "J ll

1 1 r ' r • '(lt 1 ( 1 1' 'l'\ ''~ '"'11 C'11•101l\ (; I ~

. , Co) ., \A o f.:

t L\(L)=- u

5 -OJZ- cr(!-)=t

L OJ W ct~S ~0 \d~

\'vH'\ ~ (~ \Jc on{?. or ·\'At o\ h . .Q v-.

(j)

Page 2: FEA_Lecture Notes

v(o)- ~o

* (ov b{ o thOV\ !?:>.c.) 1 t I~V.IY'O ,,, f.':oi»1CI(t, :~ (r"r~·J.:",'

> QV(.Jiied. to +~ . S.--Q(_I(LI df\\'J(I..h.IC, (1!-

, . f..~·~ r '.(1 (Y' ,._.; "\ e '('\

v. (o) ~ 1,\1)

1!--­~--. -

~"'

~l V'J f. 'Y '> f\

DI~I(H •.f\ ~G

@, \.\ (o)

!J( G)

rr-(t..)-

I- ">7. . L

CI\N Be (trHCt-L

~·f:>'(\.'L[I ('l~ 1JCVtAANN E..c,.

WE Po N 0 I (ON S 1 DE~<.. 1\ ( {\ '.. r;.. \J J •- C f~ .__

;3ot1 0.G. f.\t<E NCur--'~Nt-J .' (~Qd·h.c..vcnJ)

r : ..;.. t ~n I • C>

)..-(,

r I

tl-C U, X: I •X, I

\..

. . ( . c I

n. t' C\ .

( q ll (l h c I) . ( ',''i(\(1 :w (

d~ t {- {\ dx \..'. (c

J

}x ( E 1A 1 -x) i (- - o ? _,_.l- r•(y_) +-

Cz -

Page 3: FEA_Lecture Notes

-==:7 f1 \ rz_ \ n-t 1 r r 0 _r .': r1 /', t (' n n '"' · 1 .L V ""' "''=""' U v :::VILA ((A..tl 'v 1,:\ \..\..r•'QL\.( S:C'IL\.110r1:

==i NQumcunl B.G.<> Cdc~u con ~-t r:i~~cihcd r :~\(:,

[\ Jl.

0

\ \t'Y\.t -dept ndtld- ,Q) 0.$'1(,! h--J p) :' bLtl"11 (1'1"\j~ ic; t'lv,.pc~ i)()\ic., Poe r)

~~ 'ow n9\'~ ll(..vv1

~'.e o'e utll~ fiJns,·oJYif1J S\-{o/ys:~ok ~·!'), ( € t ic-,f-: c.. PDf s)

't./"" \: ( rr I(\ r 0'1' ~('{~ of e I OS htdlJ T

,. f

~ \), \..Q.. \ ~ ( )~J :

oo- r ~ t 1Y.; - o

d' ry , ...

L J d.u~':'h-JfllYlChofl

f (I{)~ r ·' 'f f....\ -I

t (t, L)

tr!..fYVo.\. (~v,,p\\oJ 1~"0..1 ~~\t

(\r,\Y'O 1n Lt.~-wt~t1

( d ·Kn d(nct-rd b~ £=- un)

x--o ~ x- L ) {~u ·~\·: I "'-.C. PV'.J po t·VS 0 l­L ~ ~U.H'~C'' :c:..)

-11 r- ~. c.:s 1 ctkt c etr( ot ~)

I ~'( :.t. ~ \ t'1~ S '"V\.C

p~ot1LC 1'1 v\J ~ lA \d G~ ( J{ V C G) 1St Y(l iN d

·~ h< '{.:1) va' clc:('J.

Page 4: FEA_Lecture Notes

' I ( {_

lvtt \D (SrO-'O.X) ''(\JC\X ~'f->tlG pv\JH-rm oJ~o tYic,atl~ ~s.o+- cr- ('.:·r-....(S\,,-e.,

IV CIS~ \-ycun~,f-crt. 1 , 1 ( n-t¥1 flC '( 0. tA I~Q_

I v 4 ;::\l"o L1\Cl£): (o>L) ~ ti ()_-xn l;\t> 0-.11d v3-vl<· 1

+- 0-X' ~ H·-.t l c Y' S~1~ Lt fl \,Q

rc I cchurl

~f.o,t- .-

J-=--ku,-x, ~-~£h t\'c.d­'1lo

~luY ,'~~)'_ -f-(-x) l(\ '"' -)

'V\J ~ oJi \I'C t I - c I - · ' v I

c\ .Jt\ s-<-il'~' ~a y o\ \ll ' '',L} -

.ft vt 'X. Sov, ~DI-\ t< ~ ( Cl'J 1) \\-\ON~ :

-· 1 ( ~ lA \'\_, {t. YU~ p \ {. ': I IV) pi J

~(!..)- -~.

- ~

\;\ (()) - '-''·o & 1l}(t.j-= V\j 1 -0~-

~0 tA-l'\ dcdt" .. ~ ~ ( L-} = - -~

I

~ r I 1 '\ 1• :,1(' 1 1

T -:.- ~..( ClJ \ ~ ~ l t \ 't aJ- 'Y - L .

\Lc~J ~~~ ';{'ron~ tl>fn'l C'~ a hNOr PDt;- of £•,pn·c- ~t}P'./ tn Oru dit'Y\.~.J'1S\ort.

F 1t1J ~ (-x) ~\v-cn V.~ 1

V j or<- t- > + Cx) o .. F'o t:t\.C Cons-.hhth•A:.,

V .C \ o..h D• \

\;:: r· U t:; >)(.

su <..Vl t-~cU-

.--t do- T F ~ 0 d"?

1\t\.\ S. ' s. c C\.1 1-e J I \ U. $TR D N C, -'~ ( 1)\'\c\.\ tiCn MV\ ~~ no' 6

I \}. ~L) ~ lAj ~

-0 R.­()(L)-: t-

f 0 ~' " \ 0 ~ -t w c ct t' cd 1 r" . Cl\. t E v ( f2 'I po t n.-'"".

Page 5: FEA_Lecture Notes

- I

--; I J { ~ ~ )' t· .1- =- 0 ! d~ d--x \

I

NOI~ ~ \l S\01.)\A\~ 'Q~ 0. h.H1diDr1 2>1A<.~ t'r"cd -\~0 JQ..V\Jeth-tfJ Qr{ pussi\-;Ul

(i.<. V\() ~~(O)'dilll.-llh.({).

\J\IQ rcqvt.u"t' Slf2.oNl\ CaNDtnDN~ o~ 1 Sn1cot~u\f!:.<' cr1 ~((x) 1C'(Ot'.st

~~\f 5.twYj ~ 'VYY' t1os ohNtJ_ Spo.h(l' aQV\vO-hvf~.

·J ~ llf.C\tiHCttt1~ 0-t:IV lf ed ~0 \ t.\..nO{l

f !i'' Y~ f,J,,) \IJ~:YL ~ be lc"@S +o [ 0 1t-l 0 v ~ t- LD \ L l

~ =) o- (j)- o-( o)- -- J+·Jx

)

0 0

~

J f d~. 0

~ d~ i d X I

0 ?.

j ~ ~~ \ 0 0

f diA I :r. Jy 0

ft,J OR_ --<:v rr ·r..Q J

\t?lj ~.G. @ l_

~I

lAb -

Page 6: FEA_Lecture Notes

8·o~ Th-e. Weak FonYl t:.:.. u. \ ,'!(ir· ~ 1iph<.- voG- i~' Gt\Q di\Mr~lo-,1-

I f..{.~~ IS

l ~ 'N£-1\l'­r 012. t-'1

\l.ol\ ___ _,

Fn''d tA C :i) E 3 co >po.c..c oC.. -h\vx.h~Yl:

s r), \. " ( ") ~ .,.1 ~ (1)"' tC\ I 1\ s Glt I V\ $.1.,.\ U/1 1.-!rOv-\- \J ( 0 )-::. !) 0 ,

~C\S\cC\lli- 1 ~Q \o(Jk_~ \n ~~ '.)irrc.~lct 6.C ..

S\AlVl -tno___+ {\)( w \ w b..c.\DV1t}\f\&\ -t·o

\} \N c 1'\j::

0

tJ.vJnr;l~,\ {hr n'vcvC C'tjvto..hcd 4-ltlvV\t\j~l lA-t P.,(Y-), n eo 1~ va\un~P 1\'"\H.=·s· ol~.

L.

1\ (X) Jx - ( \fl ~ 1\ ( ")d y \- 't l ( L) PI ( )<.) . t \ j \..._...-.~ - y- J

'\......--'"y---.../

\J () l 'v\ JYU. \: \ C rhQ 11\. +

0 \f0\\1\n"(

.Q \.QIIW: v\,-J.

n-tf FtNir£ GLc Mf.NI N\E-ntuD

11-\ IS, \N f-1\ t ro ~M .

~ovn~C\I'tj ~ (}({j_.

\\- \~ oJS.6 rN \?O.~f~ of oH\..CY VOYill~lut\(t"q i;(l.:.cJ 1

\1-..1 s~'l\~ f"ofm OX\d WQG,l r-ovrv) Ctrc r~ lttiv t\\--e~J- ~ -.J

4 (po.c¥1 tMp\~~ -lw oHur)

Page 7: FEA_Lecture Notes

do- + ( - 0 ( 0 L) dx -t - In '

8.G. ~ · ~((o)-= \;\~>

" ( L) ~ t- w~cre ()- ( u,)( )

lnrroJIAo. 'II (-; 11= i w \ w(c), of

W; '>J\1Ql9~'-ht"~ ThVI<.hDYl

L L

tv\vJhyi~ Sh~ro. torn"~ lAf w a-hd \+e~(cd-c ovev lo, L)

Sw Atx) J.u d X ~ clX

i 'N (\ { ;<) + J y ::: ()

0 :------- ___.)

\\1 v ~ (,_) (i)( + .., >y 0

... .. - - -

L L

) w,," ~~~)dx..:. f \N ~~~)f~'l 1 0 0

L ~

j '~'~,") o- 1\!v.l Jv ~ J w ~ l~l f Av .... 0 0

l t \T(L) 7 t-

J 'N [\(~} ~ dx +- 'N(L) t- t.~l-) i)

~y---.-'

ttOrll OCJfH.Q QlA)

D1r 1 ck~tL-

Page 8: FEA_Lecture Notes

Find ~\ f- S =- {' u \ ~lfo)- 1.\o} svrh 1\•(1.1-

~ '1\1 f '-'\) = ~ \JIJ i 'N :o)~ t' 1 L l ( ~ \f\J l '/. cr- b. l'f) o X -=- ' ·' A ( 'j;J .( r\ 'I -\- \\J ( L) ( l-) r\· ( L) 0

- v--- _/

~ ln¥~r o.l c b~ pcu h

L

f ~ -; \'! {, C• X { 1/\J CJ A \ L - _\IN A (x) J )t } 'N (G) cr ( L) A ( t..) () 0 0

L

do- r ' -- 'N t ~' c: I

d~ J 0

L

IJ(~..-)0' I 0°u\ fJ.r,;

J lfJ A (X) f d 'I ~ \' J (:...) ( t ) {; ( L) u

L

J do- 1

d~ \f' 1 A ( x) cl )( + W ( L) A ( ~( L) - -t ) ~ D

j \J'IA')() [- f- ~i j ;X + W(L)A (o-(t..)-t) ~ D 0

1h 1 <;. lnDl ds \f W f: \T = -i W / W { o) o ~ 4 ~\so ~ o \ c\ <:. fur V 1 (x) -- cP { x) (- ~ x- t /

~--t- /1! vv V\.9 i"( C1 { t) ) o -hv -- f- f::- ( o 1 L-) o

0 ()<.) =- c o ... t-- X-;:- t n, L l ®

Page 9: FEA_Lecture Notes

.! 't ' I rr ' . .

-=-)

N c J r (_)

L-r ( , , A 1 - [) ) cp (-x:) ( _ (fn. . • ) . o-;,- - 1 elY

l)

TYUS i~ /o

(Of f:,.,. ~

, ( L . I

- o- - . I A ( f ) 0 X .- 0 ) l:

'-----v----------

\1'~ 1..( ~~ bv >o s1r-t9. l l. IS ()..

•VI Levie< OlJW'O 1(1 S ~ tA (). r.e. .

0

\} V\J f -v:-0 \\ { L) A ( L) ( G"" ( L) -- {: ) - (_)

I I ./

\J( c) - t- ~I E u "-~ A f\J N g c. ! / (~ii\(L '-JI(L) & (\(1...)/b)

\-.l Oft-·. l~c 'NCC\k:. f~'{TI' (l1Yr~r1 / ~-(\~ ~~ Plf\Cl1\-Ct i?oLu1Jo1~

(.O{Idt~Dfl \Jo~J in·.

Page 10: FEA_Lecture Notes

(

\.

(2.o.LJ 1hf. Str:i · 'l ~ 'Noes~

v=- r ·J ' I X

l OlT f- l" \(i ( ' - .l.

dx

tJio)~ Vo

') (I -' • J +-

- f\ rf'{t~Yi (Y' C• h :-'(!~ fJ~

~\!\-{> ~ v 1 (, d s

.....

--)

J J.

--1...-

\\Jf f.\~ r r r-- r-A : -

r, (\ J V\ & s -:: r u l u ( [") =- \1 01 St' ( ltl + \ '\Ct t-

(' ' .., ;.J W E '-'l- ~ JL Vv • iV l (;) -- 0 J

I

r- ;-J w,-x CJA dx = )"'1-f-Acix. + 'NfL)tl

0 0

N i(\Q, ~ h i'Y'.).. 'vi ~ 00 . ..J

ConStntc:t- Opp(l)'XfrYlCL~Cn.:. •r -G'r · ~c-ckN." f.··c~'o. i fv .. /\c hoY' S:.plU~ . ~-~: ~-x,)) Y1~o)l

~S)-y\(,1-- ih.C Soll,.JJtwl SpaLl ~ 'NO.•j~·}-l('J -~v Y'C~10tl 3DaJC

Page 11: FEA_Lecture Notes

. ( sv,b3JJ-

fln6 L(~) E; s~ c. g <kn cro ~c ('

; )'I 0 ??il)X( m o,Ji Cf\

of LA [ u ''s~.q::J' k)

J' lc ==- f v."" e y, ( o, 1...) \ ,/' ( o J = v "1 \ I \f\1~ L 'A-;-\<~ C vu

.S\AU..1 -H, od- -r c:; u

'\) 'o ~ i \\J h (:; ~' ( o, L) \ '1\J v. [o) = 0 j

1 1 r • I I>

L

L

( ·~ r , \ VI· 1 ~o'Y .!-

)

0

\_

I

f \V\\k- D\fY\t 1\)iona \ - ---\N.QC\ l ror(•(1.

,, (1akr~in

' I Nra ~

rrviY''

- --

) w,., IT A J X "

0

f lJ\1 ~ ~. J~ L 'N ( L H h-

Page 12: FEA_Lecture Notes

(

I J ,.. I ! \ I I r I I ·- ) r V,ll'l( 'f't ' ~ 1

'r S - MJ ~t f( t· <;; n fi_S.. 1 : co~( f 1 tr 'cr ( hr•(' ~~" ... I

I ((Cll\ v'' f. J£,_.:- [ u'· E= 1-f (r,L) I u"'!c) = ll, r t

C'DV'I. iJ.t r () (v,Y•tf"ICn I : (o1 L) ~ [/(._

lli.:-ir\C H\f 1u,V1c.hDt1 \j +r \:21:: CUl L2-·tLt~l(~l6r\. P-- i...

J Z I V OX- < o..._

0 ~i.e. H'\.t +~,~..~1chon ,~ boV\.t-1~(J ov" H\..0 tVlttvvCLO

4 i.-e. ihl hAY~tiio" v is L'- il i~ iS sqv<Ar~ 111 k' g v cdJ LQ . .

\J(y) =:.

V(v..}==

\J(y)::

\1 (y) =- hx--x:.) f:.- L.. ( o, ~__) 1

b.( I tC\ ttA~" di [H I

L2-

Page 13: FEA_Lecture Notes

(

l

Or1 c etn \ n O:..c,HC 'f oJ rk ~ ~tt '-'

~ow a f.. :,a.+ cr.,,lrc~ cv"'f ~\\( du'ivcLhv€~ o~ \J? ( R(jVviClv'+j) I v ('I) e H- ( o, L; ~~ .

j[\J'-+L,k,, '(\ Jx < C<J

0 ~ -to .er1sure cov~c.J. LHliJ$.

R ei\11 a~ k:: ~ has bu Vi \(I rrv J{ I c.c 6. for d q'Y\.() n $. l CY\ oJ pt q fO~(' !... '/J

l n 50' tv o..~ 'J1 ~. \'Y\. ( C' 1 L) = L ) J . S f:)~th o.J cl\ l'n.Q vl)fo

} I d.:: \ fa-r I d\lh(l

1\t\.f n.s t \ re o { H\C C1cm Ct HL

L

\1 f K'(o,L) if J rv, • (M(o,LJ)'- v,.._2.},Jx. <. 00

C> \ __..,.~-- -, r- --____,

\JW o,\"E c t·VlfYt \It 0 _9 \1 ~ \f~ f \ r~.: h r c:1t V\ \J e,~._-nv-e .

Nt w: \Ah c J .:_ 1 u ~ {:; ~ I ( 0 I L) \ \A~ ( «>) ,-- iJ' ' ~

u e \At.., I~ b 0 t.;- h de. J 0, n d ~ o I S. U ~ x. .

"' s.q~oJ-e.. 1nk2ro.hlc..

-8 ·~. \·f ( O, LJ ~V\ ChOY\S

\J ( "?) -= w Yl s h:u tl-n \.::..

' I (1-.):::: 2 0 <.. 'Y \(:o v l I \•rJ_o ... :r---_

Page 14: FEA_Lecture Notes

f '

\

\ -\--)X 7--!;) L

I·" r 'ctJ \: ~ lv. ~ oJex~n ( F\(\\k- 'D1 n\Cll;\o raJ/~ ,jJQt\ l t:"onvl.

fi(\6 11 11. f s"- = t ~"-E- ~I (o,c-) \ \,\(O)o V.o 1 J I , 1.~ \ c_ I. '

o.! 1-{... (oAtoo 1Yl0 I!AnC.rlCl'

'>Me-\., +~o.cL+- \j W" t: 'iJ-k = { \N '- & HI ( o, L) \ ·-N\ o) ~ D 1 L

_ ( 'N \,. ~ j.. 0 x ~ v·}''( LJ t t··. )

0 0

!:' -\JIU~ IS ~\v£.Vl I $:0 / (

Vk = ~ lf..~x. ) f lX) \'\o ~W-d tu 0-ffrt'<lrt"\(t)t. ( 1..JO,I {i tlt~'t( ~ e:siYi'\f.f,SICll

1 (\.' ~ olso ~\c \A> f ~ -t > buJ O\" · ~ i ·r- I D caso..

H-ow do \Ne_ obt-cun "~"' , 'J\l h ? C\ H-e vr"o..-t c (cf, f:;.. ;A;- h. ? =l t='a.xh~oVl Co,_) itV-D ''f\Yl(tf e).(..r-,vu4s'' Wh-ich. o~

d1·S k-o i h-t S'.Jvbc~ovv1 cc i 1 '<; D~ ( o l L).

Page 15: FEA_Lecture Notes

------r -- ~ -__ l

_n = ( {) !..._) ..... _ \ I

'1' 9en.e ~ cd JoMcnn

D I (I L"' I ( e. J1~ I I \01 :.; HoY\.Qo .J _ :'f'v, u Sv odoYnCL·u· ~ - L ) (S O.VI ~ <;!At:: ootncti

JL s +~ c)c~l!t"e- ot _f)_ _ ./ tJo~A.noo.f~ pot f\1 s c-~ Q.

_n_- J1U JJl

\.

Page 16: FEA_Lecture Notes

( ' Q, - ( e.. e ~ l) _J ,_ - X. 'X.

\ - - ..- .,

dor:. net- r·i1•!1tt1 \·<; tVdcd poti'\~S. ---

- ( t-- - ~ ' ht <; ( on\ 'll'l \. )( 1

1\1'< t> 'X' 1 j

t). -~ ---- --, - _____ J

-t tl- -~~_/(~._~ _ 7N ~ ()€ -+- -y c ~L .v

L

N '/'\·I 1 "':=:.. f ' ..,._ Y·O~C'J Qf.

----...,_, - r-----

N I L

Page 17: FEA_Lecture Notes

\:j.Q~H\Q. \oto...( bos:\s {\A.YKhOr'.S. OY1 J'Le.. ___ -(\(\·\~ h·Arnbtr o~ v o S.t~ ttAn ch mts:' - o '~'<? (' - (25- rt nd -\ ~ re for€ 0 '/'e r J2 .

r

\we ba~\~ ~t,lr\(~lOAS 0\JC?..r C ... "·.. fc\'-11\C>''~''cSt) CC'rr,rAcfc.. \· (is;(

d~ : Q

1\ f \ .)... \""f..,} -=

e

Q __ ( L

f.\- I L. )

rx.(L

N A ( -x.) : h 0 d oJ ba Sol ~ f I,U\ c h' 0 fl !;

d~ · t'IC)dCL~ d( 9\'€--f>S o{ f~~d CIYI..

SifY\·, \ ec r l'j -For w~ ( ;t} !

Nn <:.

w~ (-x)=- L N"Cx) c~ /', \........---r- .J / - '

n~l · I VJO<).- iS ~.( "'< -( r ~ .( ('(--f' C'l ()I'Y\. 'k IS. dt( ["Ct-evt+·.

\ Bltbnov- GoJ{J k.\n ~~\l \ ~~:dny~cz_

Page 18: FEA_Lecture Notes

•-''\ ~

( ..... l '.;..)

0 r-....... .... -I- . \ ...... -~ ~-.)

V) .......

~ 8_-~ ~ 0 ~ '- ...::5

·--------{'I I

'X

dv..c lu t V..t I\"'-C1 f·P'-n ~ _.. )..,-... "'

N' ( >'--) = t\j C --x- c ~ '1 J :::= I

~\2tx) ~ I \2-{'X( ~))-==-

6\- u. n,J- d o VYlCA-i n

(a ko IV1Cd l--\.Q rr leU ' r cJ'1

J o t'Y) c· \ , ' )

N 1

( ~ ) ==- \ - f "'\ 2 Cf ) --- ( ) { 1-t-'F ~-\

A

I~

C-1

2..

~::I r.'l..

I

( \ i~ A- B s A~ :::. t O 1 f f\ 1 P.~ \./'0"--

k rt• .tc kt r ch lt f\

HI(~ ) +- N2 (~) "" 1-,_~ +

f'j' (-I) = l

[\J 1

[ I)= 0

(\f2 ( -l) ": 0

N 2 (r)~ I

Page 19: FEA_Lecture Notes

~mu.r~: l1u \0(01 <kht1lhon o~ bo~tS ful'lctioY1S. {foJs

~ 0 ~~ 0 t;c.d \;u h) ;l<t he honL a~o cia k d w 1Hc. .o och n oJs, y ~ n P ··I 1 _()_ €..

With COIYtpa.d St.-t.pf>o(+ '" _\ L:- Ct..no

L e

---·

Page 20: FEA_Lecture Notes

(

'f;- I (

()

~ 1- ~

_Q~ 't; ::- I

(

I

)

~'"A_.(: I I

-+-------

. l I r \ t" "-r + )'I

~ ~e (\

d~ ~ '( "

rx~- 'X-~

~z.."

'){' f-1

o------•

-· -~(. : {. c lf\ \.(1\:f- £.c I'~~ l L

1 \1 ( r.. 1\ L \ '0\tV ~ \.,{ S TD H J\ \) E

___ _..

Page 21: FEA_Lecture Notes

~NO

I

' tJ " l'?

Page 22: FEA_Lecture Notes

I"J I

t?·O I 1

... I '--

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