UNIVERSITETI POLITEKNIK I TIRANES FAKULTETI AKULTETI I INXHINIERISE MEKANIKE DEPART DEPARTAMENTI AMENTI I PRODHIMIT PRODHIMI T DHE MENAXHIMIT SEKSIONI MATERIALE
Detyrë Kursi Lënda: Lënda: Teknologjia e Materialeve Materialeve Polimerike Polimerike
dhe Kompozite Tema: “Sjellja “Sjellja Mekanike e Kompoziteve me Fibra Jo te Vazhduara ”
Punoi:
Pranoi:
Albjana HALILI
Dr.Ing. Inri! VO"#A
Tiranë 2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
T$ %$na! & &!'r$( : Merret në studim një material kompozit me fibra njëdrejtimore jo të vazhduara i n!arkuar në tërhe"je në drejtimin !jatësor !jatësor me të dhënat e mëposhtme### $ërkesat % 1#a& 1#a& Të vlerëso vlerësohet het ndikim ndikimii i faktorit faktorit të formës së fibrës fibrës s mbi n!urtë n!urtësin sinëë e kompozitit' 1#b& të !jendet !jendet vlera e faktorit të formës s për të (ilin n!urtësia n!urtësia e kompozitit kompozitit me fibra jo të vazhduara arrin në )*+ të asaj të një kompoziti analo! me fibra të vazhduara' 1#(& të krahasohet kjo vlerë me atë të faktorit kritik kritik të formës s,# 1#d& Të llo!aritet shkalla e reduktimit të n!urtësisë së kompozitit me fibra jo të vazhduara kundrejt kundrejt asaj të kompozitit kompozitit analo! me fibra të vazhduara në rastin kur faktori i formë së fibrave të të parit është i barabartë me atë me atë kritik pra kur s - s,# 2# Të shihet se si ndikon fraksioni fraksioni vëllimor vëllimor i fibrave .f .f mbi vlerën e faktorit të formës s të për(aktuar sipas kërkesës 1# b /# uke pranuar pranuar se kompoziti kompoziti i nënshtrohet nënshtrohet n!arkimit n!arkimit në tërhe"je tërhe"je në drejtimin !jat !jatës ësor or pra pra në drejti drejtimi min n e vend vendos osje jess së fibrav fibravee të ndërt ndërtoh ohen en epju epjura ratt e sfor(imeve normale të fibrave f - f13& dhe at4re tan!en(iale të ndërfa"es 5i f23& për d4 raste% a& s - 0#6 s, dhe b& s - 2 s,# 7s, është ajo e për(aktuar në pikën 1#(&' të dhënat e tjera mbeten të pandr4shuara#
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
Me"enese kemi nje kompozit me fibra jo te vazhduara moduli 9 tij 9 elasti(itetit : ( pritet te jete me 9 vo!el se ai 9 kompozitit analo! analo! me fibra te vazhduara pra : (; :(v
E c= Vf * Ef
Ku n =
[
[
1−
tan ( ns )
ns
]
2 Em
Ef ( ( 1 + Vm ) ln
( ) 1
Vf
+ ( 1−Vf ) ) Em
]
Vm koeficienti I Puanssonit I matrices.
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
7. Kompozit Poliimid/Karbon Matrica: Poliimid : Moduli elasticitetit, elasticitetit, Em (GPa) Kufiri "#ndrues$., %ms(MPa) %ms(MPa) Koeficienti i Puassonit, Puassonit, 'm atimi relati' relati',, -ms() Fibrat: Karbon SM: Moduli elasticitetit, elasticitetit, Ef (GPa) Kufiri "#ndrues$., %fs (MPa) (MPa) Koeficienti i Puassonit, Puassonit, 2f atimi relati' relati',, -fs () 4raksioni '#llimor, '#llimor, Vf 5iametri, d (6m) 7d#rfa"a fi8#r 9 matric#: for forcimi cimi tanen tanencia ciall i deko$e deko$e;io ;ionit nit,,
.! &! . .! / 01 . 3.!! .!! 1 /!
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
).a * T& +l&r&(o%&! ni,i-i ni,i-i I a,!ori! !& or-&( (& ibr&( / ( / -bi ngur!&(in& & ,o-0o1i!i!.
Ecv = Vf * Ef + (3+ Vf) Em = / * .!! + (3 .!!) * .! = 133.125 GPa
n =
[
] [ 1
2 Em
2
Ef ( ( 1 + Vm ) ln
( ) 1
Vf
=
2∗2.5 240 ( 1 + 0.33 ) ln
( ) 1
0.55
1
( 0.0262 )
2
= 0.16
( 234
[
E c !" # E"
[
= .!! * / = 3 *
[
1−
1−
1−
tan ( ns )
]$
tanh ( 0.16∗50 )
0.9999 8
ns
0.16∗50
]
( 1−Vf ) ) Em
]
+ ( 1−0.55 ) 2.5
+ 1.125
= 116.63%2GPa
(254 Ec = 3 *
[
1
0.9999
]
+ 3.3! = 11&.3%3%GPa
]
1 2
=
[
5 319.2∗0.5978
]
1 2
=
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
'75 Ec = 3*
[
1−
0.9999 12
]
+ 3.3! = 122.167 GPa GPa
'&0 Ec 3 *
[
1−
1 14.4
]
+ 3.3! = 123.&6(2GPa
]
+ 3.3! = 125.627( GPa
]
+ 3.3! = 126.723GPa
'110 Ec 3 *
[
1−
1 17.6
' 130 Ec 3 *
[
1−
1 20.6
' 150 Ec = 3 *
[
]
+ 3.3! = 127.633%GPa
[ ]
+ 3.3! = 12&.0066 GPa GPa
1−
1 24
' 200 Ec 3 *
S
50
1−
1
32
60
75
90
110
130
150
200
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
).b * T& gj&n&! +l&ra & a,!ori! !& or-&(/ ( / 0&r !& 6ilin ngur!&(ia & ,o-0o1i!i! -& ibra jo! & +a1%uara arrin 758 !& a(aj !& nj& ,o-0o1i!i analog -& ibra !& +a1%uara.
Ec .&0 * Ec' = .&0 *
) ] Ef Vf + + Em ( 1−Vf ) [ Ef
= .&0 * 3.3! = 127.%GPa
7a rafiku eme faktorin e formes , ku >as le?imit ne rafik s, e etur e ;e'endesome ne formulen formulen e modulit te elasticitetit, elasticitetit, Ec.
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
7e rafik s, es$te ne 'leren 'leren 3!. 3!.
' 152
[
E c !" # E" .!! * /
= 3 *
[
1−
[
1−
1−
1 24.32
tan ( ns )
ns
]$
( 1−Vf ) ) Em
tanh ( 0.16∗152 ) 0.16∗152
]
]
+ ( 1−0.55 ) 2.5
+ 3.3!
= 127.6&%(GPa
'
l =¿ d
l ' # d
¿ >¿
3! * 1 = 106( μm
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
).6 * T& ,ra%a(o%&! ,jo +l&r& -& a!& !& a,!ori! ,ri!i, !& or-&(/ (9 .
>lo!ariten vlera e faktorit kritik te formes s, si dhe ajo e !jatesise kritike te fibres l(# s* =
σfs 2 τ
lc =
σfs∗d 2 τc
= =
3670 2∗45
= (0.7777
3670∗7 2∗45
= 2%5.((((
μm
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
). * T& llogari!&! (%,alla & r&u,!i-i! !& ngur!&(i(& (& ,o-0o1i!i! -& ibra jo !& +a1%uara / ,unr&j! a(aj !& ,o-0o1i!i! analog -& ibra !& +a1%uara / n& ra(!in ,ur a,!ori I or-&( (& ibra+& !& !& 0ari! &(%!& I barabar!& -& a!& ,ri!i, !& or-&( / (9.
E c !" # E"
[
Ec 3 *
[
1−
1−
tan ( ns )
ns
]$
( 1−Vf ) ) Em
tanh ( 0.16∗40.7777 ) 0.16∗40.7777
GPa ] + 3.3! 112.&026 GPa
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
.* T& (%i%&! (& (i ni,on ra,(ioni +&lli-or I ibra+& / V / -bi +l&r&n & a,!ori! !& or-&( / (/ !& 0&r6a,!uar (i0a( ,&r,&(&( ).b*.
2# 9#a &?er(aktojme koefi(ientin n dhe me pas veprojme njesoj si ne ushtrimin paraardhes#
Ecv = Vf * Ef + (3+ Vf) Em = / * .! + (3 .!) * .! = 61.%75 GPa
Vf = .!
n=
[
Ef ( ( 1 + Vm ) ln 1
( 0.0113 ) = 0.10
2
] [ 1
2 Em
2
( ) 1
Vf
=
2∗2.5 240 ( 1 + 0.33 ) ln
( ) 1
0.25
]
1 2
=
[
5 319.2∗1.13862
]
1 2
=
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
= 0 *
[
1−
0.9999 5
]
+ 3.@1!
= (&.%%1GPa
' 60 Ec 0 *
[
1−
tanh ( 0.10∗60 ) 0.10∗60
]
+ 3.@1! = 51.%7&GPa
'75 Ec 0 *
1−
tanh ( 0.10∗75 )
+ 3.@1! = 53.%77 GPa GPa
0.10∗75
' &0 Ec 0 *
[
1−
tanh ( 0.10∗90 ) 0.10∗ 90
]
+ 3.@1! = 55.20&GPa
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
' 1%0 Ec 0 *
[
1−
tanh ( 0.10∗180 ) 0.10∗180
]
+ 3.@1! = 5%.5(5GPa
' 200 1−
Ec 0 *
tanh ( 0.10∗ 200 )
+ 3.@1! = 5%.%75GPa
0.10∗200
' 250 Ec 0 *
' 300
[
1−
tanh ( 0.10∗ 250 ) 0.10∗250
]
+ 3.@1! = 5&.(75GPa
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
7a rafiku eme faktorin e formes , ku >as le?imit ne rafik s, e etur e ;e'endesome ne formulen formulen e modulit te elasticitetit, elasticitetit, Ec.
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
2# 99#a &?er(aktojme koefi(ientin n dhe me pas veprojme njesoj si ne ushtrimin paraardhes#
Ecv = Vf * Ef + (3+ Vf) Em = / * . + (3 .) * .! = 73.75 GPa
Vf = .
n=
[
Ef ( ( 1 + Vm ) ln
] [ 1
2 Em
2
( ) 1
Vf
=
2∗2.5 240 ( 1 + 0.33 ) ln
( ) 1
0.30
]
1 2
=
[
5 319.2∗1.2038
]
1 2
=
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
= 66.7372GPa
' 110 Ec 1 *
[
1−
tanh ( 0.114∗110 ) 0.114∗110
]
+ 3.1! = 6%.0116 GPa GPa
' 130 Ec 1 *
' 150
1−
tanh ( 0.114∗130 ) 0.114∗130
+ 3.1! = 6%.%&GPa
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
' 250 Ec 1 *
S
[
1−
tanh ( 0.114∗250 ) 0.114∗250
90
]
110
+ 3.1! = 71.23GPa
130
150
170
200
250
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
n=
[
Ef ( ( 1 + Vm ) ln
] [ 1
2 Em
2
( ) 1
Vf
=
2∗2.5 240 ( 1 + 0.33 ) ln
( )
1
( 0.0170 )
2
= 0.13
E c !" # E"
1−
tan ( ns )
ns
$ ( 1−Vf ) ) Em
1
0.40
]
2018
1 2
=
[
5 319.2∗ 0.9162
]
1 2
=
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
' 110 Ec &0 *
[
1−
tanh ( 0.13∗110 ) 0.13∗110
]
+ 3.! = &0.7%GPa
' 150 Ec &0 *
1−
tanh ( 0.13∗150 ) 0.13∗150
+ 3.! = &2.5%GPa
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
2018
2# 999#b & Ec .&0 * Ec' = .&0 *
) ] Ef Vf + + Em ( 1−Vf ) [ Ef
= .&0 * &1.! = &3.6 GPa GPa
7a rafiku eme faktorin e formes , ku >as le?imit ne rafik s, e etur e ;e'endesome ne formulen formulen e modulit te elasticitetit, elasticitetit, Ec.
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
./ * /
= &0 *
[
1−
[
1−
1
]
tanh ( 0.114∗180 ) 0.114∗180
+ 3.!
]
+ ( 1−0.40 ) 2.5
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
Ec .0 * /
= 3// *
[
1−
1
[
1−
]
tanh ( 0.175∗90 ) 0.175∗90
+ 3
]
+ ( 1−0.60 ) .!
2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
' 250 Ec 3// *
[
1−
tanh ( 0.175∗250 ) 0.175∗250
]
+ 3 =1(1.716 GPa GPa
2018
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2018
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“Sjellja mekanike e kompoziteve me fibra jo të vazhduara”
300
2018
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