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    LAPORAN TETAP UJI MATERIAL

    DEMATTIA FLEX CRACKING TESTER

    (PENGUJIAN RETAK LENTUR DEMATTIA)

    Disusun Oleh :

    1. Anggy Permaa!ar" #$1%&11'#

    . D"na E*a Pranaa #$1%&11'#'

    +. I,-am Sar"aan #$1%&11'1+

    &. M/-amma, 0",aya Rea2an" #$1%&11'1

    %. Ra,en Ay/ Se3ya 4/2an #$1%&11'#

    $. 4",ya D"5/2"any #$1%&11'

    Ke26m36* 1

    KELAS 7 EGD

    In!r/*/r 7 Ir. Sa-r/2 Een,y8 M.T.

    POLITEKNIK NEGERI SRIWIJAYA

    TAHUN AKADEMIK 201!201"

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    DEMATIA #LE$ %RA%KING TESTER

    &PENGUJIAN RETAK LENTUR DEMATIA'

    I . TUJUAN PERCO9AAN

    1. Ma-a!"!a ,a3a meng63era!"*an a2a ,ema"a 2e: ;ra;*"ng

    . Ma-a!"!a ,a3a mengama" *ea,aan aa2 ,an a*-"r !am3e2

    II. ALAT DAN 9A0AN /"2,"ng >an,"ng !am3e2 ,engan *e;e3aan yang mana3 me2a2/" >e>an yang

    ,"gera**an. Sam3e2 3a,a >ag"an >ergera* ,an me2en/r ,engan *6n!an yang ,"g/na*an

    /n/* mengea-/" *ea-anan rea* (Re!"!an;e 6 ;ra;*"ng). Dengan 3er*aaan 2a"n8

    ,a3a ,"g/na*an /n/* meng/*/r *ea-anan 2en/r (2e:"ng en,/ran;e). Sam3e2 yang

    ,a3a ,"/5" a,a2a- *are8 */2"8 */2" !"ne"! !e3a/ *are8 !62 !e3a/ E?A ,an 2a"n @ 2a"n.

    K(nse) *+s+, il-u )(li-e,

    Ma*r6m62e*/2 a,a2a- m62e*/2 ra*!a!a ,"mana 3a2"ng !e,"*" !er">/ a6m er"*a

    >er!ama 62e- "*aan *6=a2en. Ma*r6m62e*/2 "n" m/ng*"n rana" 2"near8 >er;a>ang aa/

    5ar"ngan "ga ,"men!".

    1. Maer"a2 >"626g"! (ma*r6m62e*/2 a2am)

    C6n6- 7 *are a2am8 6,8 !e2/26!a8 !/era8 ,an a!>e!.

    . Maer"a2 n6n >"626g"! (ma*r6m62e*/2 !"ne"*)

    C6n6- 7 32a!";8 !era !"ne"*8 e2a!6mer !"ne"*.

    1

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    Maer"a2 >"626g"! ,a3a men/n5ang er!e,"anya 3angan ,an ,">a-a! ,a2am >"6*"m"a

    !e,ang*an maer"a2 n6n >"626g"! men;a*/3 >a-an !"ne"*8 >anya* ma*r6m62e*/2

    !"ne"* (/n" !r/;/ra2) "n2a- !e>a>nya mere*a ,"!e>/ 362"mer. P62"mer !anga 3en"ng

    *arena ,a3a men/n5ang er!e,"a 3angan8 !an,ang 8 ran!36ra!" ,an *6m/n"*a!" (!era

    63";). Saa "n" 362"mer e2a- >er*em>ang 3e!a. 9er,a!ar*an *eg/naannya 362"mer

    ,"g626ng*an aa! 7

    a. P62"mer *6mer!"a2 (;6mm6,"y 362ymer)

    P62"mer "n" ,"-a!"2*an ,"negara >er*em>ang8 -arganya m/ra- ,an >anya* ,"3a*a"

    ,a2am *e-",/3an !e-ar"-ar".

    C6n6- 7 362"e"2en (PE)8 362"3r63"2en (PP)8 362"!"rena (PS)8 362"="n"2*26r",a (P?C)

    ,an me2am"n 6rma2,e-",.

    >. P62"mer e*n"* (eng"neer"ng 362ymer!)P62"mer "n" !e>ag"an ,"-a!"2*an ,"negara >er*em>ang ,an !e>ag"an 2ag" ,"negara

    ma5/. P62"mer "n" ;/*/3 ma-a2 ,an ;angg"- ,engan !"a me*an"* yang /ngg/2 ,an

    ,aya a-an yang 2e>"- >a"* . 362"mer "n" >anya* ,"3a*a" ,a2am >",ang ran!36ra!"

    (m6>"28 r/;*8 *a3a2 /,ara)8 >a-an >ang/nan (3"3a 2e,eng)8 >a-an @ >a-an 2"!r"* ,an

    e2e*r6n"* (me!"n >"!n"! 8 ;6m3/er). Me!"n @ me!"n "n,/!ry ,an >arang @ >arang

    *6n!/m!".

    ;. P62"mer /ng!!"6na2 (/n;"6na2 362ymer!)

    P62"mer "n" ,"-a!"2*an ,an ,"*em>ang*an ,"negara ma5/ ,an ,">/a /n/* /5/an

    *-/!/! ,engan 3r6,/*!"nya ,a2am !*a2a *e;"2.

    C6n6- 7Ke=2ar8 n6me:8 e:/ra8 362"mer 3eng-anar ar/! 8 362"mer 3e*a ;a-aya.

    S"a me*an"* !/a/ >a-an *6m36n aa/ !/a/ >en,a /5" a,a2a- *-a! ,engan

    *e2a*/an ="!*6e2a!"*nya yang ,6m"nan8 !e>aga" ;6n6-8 3eme2aran (creep) ,an

    re2a*!a!" m/,a- er5a,"8 ,an 3a,a 3eng/5"an ar"* !"a!"anya !anga ,"3engar/-"

    62e- 2a5/ ar"*an. S"a!"anya 5/ga >er/>a- *arena em3era/r8 62e- *arena "/

    3er2/ ,"3er-a"*an >e>era3a -a2 !e>e2/m >a-an *6m36n ,"g/na*an .

    Peng/5"an !am3e2 >er/5/an /n/* mengea-/" !"a!"a *6m36n yang ,">/a8

    >a"* !"a "!"!8 !"a me*an"* ma/3/n !"a erma2. Sam3e2 yang ,"/5" a*an ,"*ea-/"

    *e2e>"-an ,an *e*/rangannya8 ,an /n/* mengea-/" *a,ar *e2aya*an 3ema*a"an !era

    */a2"a!nya. A,a3/n 3eng/5"an yang ,"2a*/*an ,a2am 3ene2""an "n" a,a2a- 3eng/5"an

    *e3ega!an 3an/2 ,engan !an,ar CNS +%$#8 *e3ega!an 3an/2BLUPKE (rebound

    resilience ) ISO &$$ 7 1'+ ASTM D 1#%& @ 1''1

    2

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    Syara /ama yang -ar/! ,"m"2"*" 62e- *6m36n a,a2a- *ea-anan8 *e2en/ran8

    *e*era!an8 ,aya ar"*8 *6n,"!" 3eny"m3anan

    9er"*/ "n" ,aar !an,ar /5" *e2aya*an *6m36n yang a,a 3a,a La>6ra6r"/m

    Ana2"!"! ,an Peng/5"an Kare (LAP Kare)8 9a2a" Pene2""an Te*n626g" Kare 96g6r

    N6 Jen"! /5" Sa/an Syara

    1. Tegangan ar"* NBmm M"n %

    . Per3an5angan

    3//!

    M"n 1##

    +. Ke*era!an S-6re A %%%

    &. Ke*/aan !6>e* NBmm M"n 8%

    %. Per3an5angan

    ea31##

    Ma*! 1#

    $. 96>6 5en"! grB;m Ma*! 18%

    . Kea-anan *"*"!

    Gra!e2"

    mm+ BKg Ma*! 8%

    . Kea-anan rea*

    2en/r 1%# Ke!

    9a"* ",a* rea*

    '. Pengem>angan

    ,a2am >en6"2

    Ma*! %

    =62/me

    1#. Ke3ega!an Pan/2 +#

    (S/m>er 7 SNI 1#11')

    I?. PROSEDUR PERCO9AAN

    1. Se>e2/m me2a*/*an 3er;6>aan8 meny"a3*an /*/ran !am3e2 yang >er>en/*

    3er!eg" 3an5ang.

    . Me2/ma!" ,engan 62" >ag"an me!"n yang >ergera*

    +. Mem/ar 3/22ey ,engan angan /n/* me2a*/*an 36!"!" 3en5e3" 3a,a >ag"an

    yang 3a2"ng ren,a-.

    &. Mema!"*an 3en5e3" 3a,a 5ara* 3eng/5"an ,an !am3e2 ,"5e3" ,an ,"*/n;"

    %. Memana3*an /5/ng 3en5e3" yang 2a"n ,an ,"*/n;" 5/ga.

    3

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    $. Meng-"/ng (;6/ner) -ar/! men/n5/*an ang*a n62 ,an ,"-",/3*an 36er /n/*

    mem/2a" 3eng/5"an.

    . Mema"*an 36er !ee2a- a*/ yang ,"ea3*an er3en/-" aa/ !ee2a-

    ,"3er"*!a er,a3a rea* aa/ ;a;a 3a,a >ag"an enga- !3e;"men 3eng/5"an.. Ke;e3aan 3/aran !e!/a" ,engan 3er"na- "n!r/*/r ma!"ng @ ma!"ng .

    ?. DATA PENGAMATAN

    9anya* P/aran (r3m) 0a!"2 Pengamaan

    1### r3m

    Pa,a 3er;6>aan aa2 "n" >e2/m a,a

    an,aan,a *er/!a*an 3a,a >a-an /5"8

    >a-an /5" (*are =/2*an"!a!") ma!"-

    er2"-a >a"* @ >a"* !a5a.

    +### r3m

    Ma!"- !ama !e3er" a," >e2/m a,a

    an,a @ an,a *er/!a*an ,ar" *are /5".

    %### r3m

    S/,a- er2"-a rea*an @ rea*an *e;"2

    3a,a >ag"an 3enam3ang *are /5".

    1#### r3m

    Rea*an !ema*"n >eram>a- >e!ar

    ,">an,"ng*an ,engan yang !e>e2/mnya.

    #### r3m

    Rea*an !ema*"n mem>e!ar 3a,a

    >ag"an enga- !3e;"men 3eng/5"an

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    +#### r3m

    Ter,a3a rea*an yang 5e2a! (m/,a-

    ,"2"-a) 3a,a >ag"an enga- !3e;"men

    3eng/5"an

    %& r3m

    Rea*an !ema*"n 5e2a! (!anga m/,a-

    er2"-a) 3a,a >ag"an enga- !3e;"men

    3eng/5"an.

    ?I. ANALISA PERCO9AAN

    9er,a!ar*an 3er;6>aan rea* 2en/r yang e2a- ,"2a*/*an8 ma*a ,a3a

    ,"ana2"!a >a-a !a2a- !a/ ;ara /n/* meng/5" */a2"a! *6m36n *are a,a2a- ,engan

    ;ara meng/5" *ea-anannya er-a,a3 !/a/ -ena*an aa/ >e*/*an @ >e*/*an agar ,a3a

    ,"*ea-/" ,aya a-annya >er/3a *ea-anan rea* 2en/r. Peng/5"an rea* 2en/r "n"

    ,"2a*/*an /n/* mengea-/" */a2"a! *are >ag/! aa/ ",a*.

    K6m36n -a!"2 =/2*an"!a!" ya"/ >en,a /5" ,"/5" rea* 2en/rnya 3a,a a2a

    Dema"a F2e: Cra;*"ng. Peng/5"an *ea-anan rea* 2en/r "n" mer/3a*an !a2a- !a/

    3eng/5"an "!"*a8 ,a2am 3ra*"*/m "n" ,a2am /5" *ea-anan rea* 2en/r !am3e2 ,">e*/*

    @ >e*/*an >er/2ang @ /2ang ,engan *e;e3aan yang mana3 me2a2/" >e>an yang

    ,"gera**an !am3e2 3a,a >ag"an >ergera* ,an me2en/r ,engan *6n!an yang ,"g/na*an/n/* mengea-/" *ea-anan rea* (re!"!an;e 6 ;ra;*"ng) ,an *ea-anan 2en/r (2e:"ng

    e,/ran;e).

    Pa,a 3er;6>aan "n"8 5/m2a- 3/aran yang ,">er"*an 3a,a !am3e2 ya"/

    !e>e!ar 1### r3m8 +### r3m8 %### r3m8 1#### r3m8 #### r3m8 +#### r3m8 ,an %&

    r3m. !ee2a- ,"/5" 3a,a !am3e2 rea* aa2 yang er5a," >e2/m er2"-a. Pa,a 3/aran

    !e2an5/nya8 rea*an m/2a" er2"-a 3a,a 3/aran %### r3m. 0a2 "n" men/n5/**an >a-a

    */a2"a! >en,a /5" ",a* 2aya*8 *arena ,engan 3/aran 1#### r3m. Rea*an yang er5a,"

    5

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    !anga2a- >e!ar ,an er2"-a 5e2a! ,engan maa.9"2a 3eng/5"an rea* 2en/r ,",e!*r"3!"*an

    *e*e-",/3an !e-ar"-ar"8 !e>aga" ;6n6- a,a2a- !e3a/.

    9"2a !e3a/ ,"3erg/na*an /n/* >er5a2an ,an >er2ar"8 ma*a *ea-anan !62

    !e3a/ er!e>/ !am3a" er5a," rea*an ,a3a ,"3er*"ra*an me2a2/" 3er;6>aan "n".

    Sema*"n 2ama 3eng/5"an ,an -a!"2 !am3e2 ",a* menga2am" *erea*an8 ma*a !ema*"n

    >ag/! */a2"a! *are aa/ !62 er!e>/. Pa,a 3ra*"*/m "n"8 ,"*ea-/" >a-a !am3e2 yang

    ,"/5"er,a3a !e,"*" rea*an. 0a2 @ -a2 yang ,a3a menye>a>*an *erea*an 3a,a *are

    ,"anaranya a,a2a- *a,ar *66ran8 *a,ar a>/ ,an *e*/aan anar a6m CNya.

    Ka,ar *66ran men5a," ,a!ar 36*6* ,an *r"er"/m er3en"ng ,a2am

    !3e!""*a!"8 *arena *a,ar *66ran !anga >e!ar 3engar/-nya er-a,a3 *ea-anan rea*

    ,an *e2en/ran >arang *are. A,anya *66ran ya"/ >en,a a!"ng yang ",a* ,a3a me2a2/"

    !ar"ngan +% me!-8 ,",a2am *are yang re2a"=e "ngg" ,a3a meng/rang" !"a ,"nam"*a

    yang /ngg/2 ,ar" =/2*an"!a!" *are a2am anara 2a"n *a26r "m>/2 ,an *e-anan rea*

    2en/rnya8 !era menggang/ 3a,a 3em>/aan =/2*an"!a!" "3"!.

    Se2a"n *a,ar *66ran8 *e*/aan "*aan a6m a6m C 5/ga mem3engar/-"

    ya"/ 5"*a "*aan a6m C 3a,a *6m36n *are "ngg"8 ma*a *ea-anan rea* 2en/rya a*an

    >a"*8 >eg"/ 3/2a !e>a2"*nya. O2e- !e>a> "/8 3a,a !aa !am3e2 ,"/5" ,engan ,">er"*an

    >e*/*an ,an -ena*an8 "*aan a6m anar C 3a,a *are a*an merenggang ,an a*-"rnya

    er2e3a! !e-"ngga menye>a>*an rea*an 3a,a *are. Se2a"n "/8 ,aya e2a!"!"a! *are 5/ga

    mem3engar/-" *ea-anan rea* 2en/r *6m36n *are. Sema*"n e2a!"; ma*a a*an

    !ema*"n >a"* >eg"/3/2a !e>a2"*nya.

    Ja,"8 *6m36n aa/ >en,a /5" yang a-an er-a,a3 rea* 2en/r ya"/ *are

    yang ",a* mengan,/ng *a,ar *66ran ,an a>/8 mem"2"*" "*aan anar a6m C yang */a8

    ,an mem"2"*" !"a *ee2a!"!"a!an yang >a"*.

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    ?II. KESIMPULAN

    See2a- me2a*/*an 3ra*"*/m8 ,a3a ,"!"m3/2*an 7

    1. Dema"a F2e: Cra;*"ng Te!er mer/3a*an a2a yang ,"g/na*an /n/* 3eng/5"an

    rea* 2en/r 3a,a !/a/ !am3e2 ,engan mem>er"*an -ena*an ,an >e*/*an yang

    >er/2ang !e;ara *6n!an.

    . Peng/5"an !am3e2 yang >"!a ,"3a*a" a,a2a- *are */2"8 *are !"ne"!8 !e3a/

    *are8!62 !e3a/ E?A ,an 2a"nnya.

    +. Sema*"n 2ama rea*an yang m/n;/2 3a,a *are8 ma*a ,a3a ,"*aa*an */a2"a!

    *are er!e>/ >a"*.

    &. Fa;6r @ a;6r yang men/r/n*an *ea-anan rea* 2en/r 3a,a *are ya"/ "*aan

    anara a6m C8 *a,ar *66ran ,an *a,ar a>/ yang ,"m"2"*"nya .

    %. Ka,ar *66ran ,an a>/ >"!a meng/rang" !"a ,"nam"*a yang /gg/2 ,ar"=/2*an"!a!" *are.

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    DAFTAR PUSTAKA

    J6>!-ee 3ra*"*/m /5" maer"a2 HPeng/5"an Rea* Len/r Dema"a POLITEKNIK

    NEGERI SRI4IJAra=6.>26g!36.;6.",B#1+B#B2a36ran3ra*"*/m/5"maer"a2.-m2

    GAM9AR ALAT DAN 9A0AN

    8

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    Dematia Flex Cracking

    Kompon benda ui!