1 Daim Ntawv Thov Tseem Ceeb
1.1Kev Tig Roving Tsis Muaj Twist
Cov xov paj uas tsis sib txuas uas tib neeg sib cuag hauv lub neej txhua hnub muaj cov qauv yooj yim thiab ua los ntawm cov xov paj sib txuas ua ke. Cov xov paj uas tsis sib txuas tuaj yeem muab faib ua ob hom: tsis muaj alkali thiab nruab nrab alkali, uas feem ntau yog qhov sib txawv raws li qhov sib txawv ntawm cov iav sib xyaw. Yuav kom tsim tau cov xov paj iav tsim nyog, txoj kab uas hla ntawm cov iav fibers siv yuav tsum nyob nruab nrab ntawm 12 thiab 23 μm. Vim nws cov yam ntxwv, nws tuaj yeem siv ncaj qha rau hauv kev tsim cov ntaub sib xyaw, xws li cov txheej txheem winding thiab pultrusion. Thiab nws kuj tuaj yeem raug woven rau hauv cov ntaub roving, feem ntau vim nws qhov kev sib zog sib xws. Tsis tas li ntawd, thaj chaw ntawm daim ntawv thov ntawm chopped roving kuj dav heev.
1.1.1Twistless roving rau jetting
Hauv cov txheej txheem txhaj tshuaj FRP, qhov kev roving tsis muaj kev sib hloov yuav tsum muaj cov khoom hauv qab no:
(1) Vim tias yuav tsum tau txiav tas mus li hauv kev tsim khoom, nws yog qhov tsim nyog los xyuas kom meej tias muaj hluav taws xob tsawg dua thaum txiav, uas xav tau kev ua haujlwm txiav zoo.
(2) Tom qab txiav, ntau npaum li cas cov xov paj raw li sai tau tau lees tias yuav tsim tau, yog li qhov ua tau zoo ntawm kev tsim cov xov paj tau lees tias yuav siab. Qhov ua tau zoo ntawm kev faib cov xov paj mus rau hauv cov xov paj tom qab txiav yog siab dua.
(3) Tom qab txiav tiav lawm, kom ntseeg tau tias cov xov paj nyoos tuaj yeem npog tag nrho rau ntawm pwm, cov xov paj nyoos yuav tsum muaj txheej txheej zoo.
(4) Vim tias nws yuav tsum yooj yim dov tiaj tus kom dov tawm cov pa npuas, nws yuav tsum tau nkag mus rau hauv cov roj hmab sai sai.
(5) Vim muaj ntau hom phom txau sib txawv, kom haum rau ntau hom phom txau, xyuas kom meej tias cov hlau nyoos tuab nruab nrab.
SMC, tseem hu ua daim ntawv molding compound, tuaj yeem pom txhua qhov chaw hauv lub neej, xws li cov khoom siv tsheb paub zoo, cov dab da dej thiab ntau yam rooj zaum uas siv SMC roving. Hauv kev tsim khoom, muaj ntau yam kev cai rau kev roving rau SMC. Nws yog qhov tsim nyog los xyuas kom meej tias qhov choppiness zoo, cov khoom zoo antistatic, thiab tsawg dua wool kom ntseeg tau tias daim ntawv SMC tsim tawm tau tsim nyog. Rau cov xim SMC, cov kev cai rau roving yog txawv, thiab nws yuav tsum yooj yim nkag mus rau hauv cov resin nrog cov ntsiab lus pigment. Feem ntau, cov fiberglass SMC roving feem ntau yog 2400tex, thiab kuj muaj ob peb qhov xwm txheej uas nws yog 4800tex.
1.1.3Untwisted roving rau winding
Yuav kom ua tau cov kav dej FRP nrog cov tuab sib txawv, txoj kev winding ntawm lub tank cia tau tshwm sim. Rau kev roving rau winding, nws yuav tsum muaj cov yam ntxwv hauv qab no.
(1) Nws yuav tsum yooj yim rau daim kab xev, feem ntau yog ua los ntawm daim kab xev tiaj tus.
(2) Txij li thaum qhov kev roving uas tsis tau sib ntswg feem ntau yuav poob tawm ntawm lub voj thaum nws raug rho tawm ntawm lub bobbin, nws yuav tsum tau ua kom ntseeg tau tias nws qhov kev puas tsuaj yog qhov zoo, thiab cov ntaub txhob lo lo ntxhuav uas tshwm sim tsis tuaj yeem ua qias neeg zoo li lub zes noog.
(3) Qhov kev ntxhov siab tsis tuaj yeem loj lossis me tam sim ntawd, thiab qhov tshwm sim ntawm overhang tsis tuaj yeem tshwm sim.
(4) Qhov yuav tsum tau ua kom nruj linear rau kev roving tsis sib xws yuav tsum sib xws thiab tsawg dua tus nqi teev tseg.
(5) Yuav kom ntseeg tau tias nws yooj yim kom ntub thaum hla lub tank resin, qhov permeability ntawm roving yuav tsum zoo.
Cov txheej txheem pultrusion yog siv dav hauv kev tsim cov profiles sib txawv nrog cov ntu sib xws. Kev roving rau pultrusion yuav tsum xyuas kom meej tias nws cov iav fiber ntau thiab lub zog unidirectional yog nyob rau theem siab. Kev roving rau pultrusion siv hauv kev tsim khoom yog kev sib xyaw ntawm ntau txoj hlua ntawm cov ntaub txhob lo lo ntxhuav nyoos, thiab qee qhov kuj tseem yuav yog kev rovings ncaj qha, ob qho tib si ua tau. Nws lwm yam kev ua tau zoo xav tau zoo ib yam li cov ntawm winding rovings.
1.1.5 Kev Tig Roving Tsis Muaj Twisted rau Kev Hloov Pauv
Hauv lub neej txhua hnub, peb pom cov ntaub gingham nrog cov tuab sib txawv lossis cov ntaub roving hauv tib qho kev coj, uas yog qhov piv txwv ntawm lwm qhov kev siv tseem ceeb ntawm roving, uas yog siv rau kev weaving. Cov roving siv kuj hu ua roving rau weaving. Feem ntau ntawm cov ntaub no tau hais txog hauv tes tso FRP molding. Rau kev weaving rovings, cov kev cai hauv qab no yuav tsum tau ua tiav:
(1) Nws yog qhov hnav tsis taus.
(2) Yooj yim rau daim kab xev.
(3) Vim tias nws feem ntau yog siv rau kev xaws, yuav tsum muaj cov kauj ruam ziab ua ntej xaws.
(4) Hais txog kev nruj, nws yog qhov tseem ceeb uas nws tsis tuaj yeem loj lossis me tam sim ntawd, thiab nws yuav tsum khaws cia kom sib npaug. Thiab ua tau raws li qee yam xwm txheej hauv kev dai.
(5) Kev puas tsuaj zoo dua.
(6) Nws yooj yim rau cov tshuaj resin nkag mus rau hauv thaum hla lub tank resin, yog li qhov permeability yuav tsum zoo.
1.1.6 Kev tig tsis muaj kev sib ntswg rau preform
Feem ntau, cov txheej txheem preform yog pre-forming, thiab cov khoom tau txais tom qab cov kauj ruam tsim nyog. Hauv kev tsim khoom, peb xub txiav cov roving, thiab txau cov chopped roving rau ntawm lub vas, qhov twg lub vas yuav tsum yog lub vas nrog lub duab uas tau teem tseg. Tom qab ntawd txau cov resin kom zoo li cas. Thaum kawg, cov khoom zoo li cas raug muab tso rau hauv pwm, thiab cov resin raug txhaj tshuaj thiab tom qab ntawd kub-nias kom tau txais cov khoom. Cov kev cai ua tau zoo rau preform rovings zoo ib yam li cov rau jet rovings.
1.2 Cov ntaub iav fiber roving
Muaj ntau cov ntaub roving, thiab gingham yog ib qho ntawm lawv. Hauv cov txheej txheem FRP tes-tso, gingham yog siv dav ua lub substrate tseem ceeb tshaj plaws. Yog tias koj xav ua kom lub zog ntawm gingham nce ntxiv, ces koj yuav tsum hloov qhov kev taw qhia ntawm warp thiab weft ntawm cov ntaub, uas tuaj yeem tig mus rau hauv gingham unidirectional. Yuav kom ntseeg tau tias qhov zoo ntawm daim ntaub checkered, cov yam ntxwv hauv qab no yuav tsum tau lav.
(1) Rau cov ntaub, nws yuav tsum tiaj tus tag nrho, tsis muaj bulges, cov npoo thiab ces kaum yuav tsum ncaj, thiab yuav tsum tsis muaj cov cim qias neeg.
(2) Qhov ntev, dav, zoo, qhov hnyav thiab qhov ceev ntawm cov ntaub yuav tsum ua tau raws li qee cov qauv.
(3) Cov iav fiber filaments yuav tsum tau dov kom zoo.
(4) Yuav tsum tau nkag mus sai sai los ntawm cov resin.
(5) Qhov qhuav thiab av noo ntawm cov ntaub uas raug xaws ua ntau yam khoom yuav tsum ua tau raws li qee yam kev cai.
1.3 Cov iav fiber lev
Ua ntej, txiav cov iav strands thiab muab lawv rau ntawm txoj siv mesh uas tau npaj tseg. Tom qab ntawd muab cov binder rau nws, ua kom sov kom yaj, thiab tom qab ntawd txias kom khov, thiab daim lev txiav strand tau tsim. Cov lev fiber txiav strand siv rau hauv cov txheej txheem tso tes thiab hauv kev xaws SMC daim nyias nyias. Yuav kom ua tiav qhov zoo tshaj plaws ntawm daim lev txiav strand, hauv kev tsim khoom, cov kev cai rau daim lev txiav strand yog raws li nram no.
(1) Tag nrho cov lev txiav yog tiaj tus thiab txawm tias.
(2) Cov qhov ntawm cov lev txiav yog me me thiab sib npaug zos hauv qhov loj me
(4) Ua tau raws li qee cov qauv.
(5) Nws tuaj yeem ua kom sai sai nrog cov tshuaj resin.
1.3.2 Cov ntaub pua plag txuas ntxiv mus
Cov iav strands raug muab tso tiaj tus rau ntawm txoj siv mesh raws li qee qhov yuav tsum tau ua. Feem ntau, tib neeg hais tias lawv yuav tsum tau muab tso tiaj tus rau hauv daim duab ntawm 8. Tom qab ntawd muab cov hmoov nplaum rau saum thiab cua sov kom kho. Cov lev strand tas mus li zoo dua li cov lev strand txiav hauv kev txhawb nqa cov khoom sib xyaw, feem ntau vim tias cov iav fibers hauv cov lev strand tas mus li yog tas mus li. Vim nws cov txiaj ntsig zoo dua, nws tau siv rau hauv ntau yam txheej txheem.
1.3.3Cov lev nto
Kev siv cov lev saum npoo kuj yog ib qho uas siv ntau hauv lub neej txhua hnub, xws li cov txheej resin ntawm cov khoom FRP, uas yog cov iav alkali nruab nrab. Piv txwv li, FRP vim tias nws cov lev saum npoo yog ua los ntawm cov iav alkali nruab nrab, nws ua rau FRP ruaj khov. Tib lub sijhawm, vim tias cov lev saum npoo yog lub teeb thiab nyias heev, nws tuaj yeem nqus tau ntau cov resin, uas tsis tsuas yog ua lub luag haujlwm tiv thaiv tab sis kuj ua lub luag haujlwm zoo nkauj.
1.3.4Koob lev
Cov ntaub pua plag koob feem ntau muab faib ua ob pawg, thawj pawg yog cov xov fiber txiav. Cov txheej txheem tsim khoom yooj yim heev, ua ntej txiav cov iav fiber, qhov loj me yog li 5 cm, random sprinkled nws rau ntawm cov khoom siv hauv paus, tom qab ntawd muab lub substrate rau ntawm txoj siv conveyor, thiab tom qab ntawd tho lub substrate nrog rab koob crochet, vim yog qhov cuam tshuam ntawm rab koob crochet, Cov fibers raug tho rau hauv lub substrate thiab tom qab ntawd provoked los ua ib qho qauv peb-seem. Lub substrate xaiv kuj muaj qee qhov yuav tsum tau ua thiab yuav tsum muaj qhov fluffy xav. Cov khoom ntaub pua plag koob siv dav hauv kev rwb thaiv tsev suab thiab cov ntaub ntawv rwb thaiv tsev thermal raws li lawv cov khoom. Tau kawg, nws kuj tuaj yeem siv rau hauv FRP, tab sis nws tsis tau nrov vim tias cov khoom tau txais muaj lub zog qis thiab yooj yim tawg. Lwm hom hu ua continuous filament needle-punched lev, thiab cov txheej txheem tsim khoom kuj yooj yim heev. Ua ntej, cov filament raug pov tseg random rau ntawm txoj siv mesh npaj ua ntej nrog lub cuab yeej pov hlau. Ib yam li ntawd, rab koob crochet raug coj mus rau acupuncture los ua ib qho qauv fiber peb-seem. Hauv cov iav fiber reinforced thermoplastics, cov ntaub pua plag koob txuas ntxiv tau siv zoo.
Cov iav fiber uas raug txiav tuaj yeem hloov mus ua ob daim duab sib txawv hauv ib qho ntev los ntawm kev xaws ntawm lub tshuab xaws. Thawj qhov yog los ua daim lev txiav, uas hloov tau daim lev txiav uas raug khi ua ke. Qhov thib ob yog daim lev ntev fiber, uas hloov daim lev txuas ntxiv mus. Ob daim duab sib txawv no muaj qhov zoo sib xws. Lawv tsis siv cov nplaum hauv cov txheej txheem tsim khoom, zam kev ua qias tuaj thiab pov tseg, thiab ua kom tib neeg txaus siab rau kev txuag cov peev txheej thiab tiv thaiv ib puag ncig.
1.4 Cov fibers uas raug txiav ua tej daim me me
Cov txheej txheem tsim cov fiber hauv av yooj yim heev. Siv lub tshuab zeb rauj lossis lub tshuab zeb pob thiab muab cov fiber txiav rau hauv nws. Kev sib tsoo thiab kev sib tsoo fiber kuj muaj ntau daim ntawv thov hauv kev tsim khoom. Hauv cov txheej txheem txhaj tshuaj tiv thaiv, cov fiber milled ua haujlwm ua cov khoom siv txhawb nqa, thiab nws cov kev ua tau zoo dua li lwm cov fibers. Txhawm rau kom tsis txhob muaj kab nrib pleb thiab txhim kho kev ntsws hauv kev tsim cov khoom cam khwb cia thiab pwm, cov fiber milled tuaj yeem siv ua cov khoom sau.
1.5 Cov ntaub fiberglass
1.5.1Daim ntaub iav
Nws yog ib hom ntaub iav fiber. Cov ntaub iav tsim tawm hauv ntau qhov chaw muaj cov qauv sib txawv. Hauv daim teb ntawm cov ntaub iav hauv kuv lub tebchaws, nws feem ntau muab faib ua ob hom: cov ntaub iav alkali-dawb thiab cov ntaub iav alkali nruab nrab. Daim ntawv thov ntawm cov ntaub iav tuaj yeem hais tias dav heev, thiab lub cev ntawm lub tsheb, lub hull, lub tank cia khoom, thiab lwm yam tuaj yeem pom hauv daim duab ntawm cov ntaub iav alkali-dawb. Rau cov ntaub iav alkali nruab nrab, nws qhov kev tiv thaiv corrosion zoo dua, yog li nws yog dav siv hauv kev tsim cov ntim khoom thiab cov khoom tiv thaiv corrosion. Txhawm rau txiav txim siab cov yam ntxwv ntawm cov ntaub iav fiber, nws yog qhov tsim nyog los pib los ntawm plaub yam, cov khoom ntawm cov fiber nws tus kheej, cov qauv ntawm cov iav fiber xov, qhov kev taw qhia warp thiab weft thiab cov qauv ntaub. Hauv qhov kev taw qhia warp thiab weft, qhov ceev nyob ntawm cov qauv sib txawv ntawm cov xov thiab cov qauv ntaub. Cov khoom siv lub cev ntawm cov ntaub nyob ntawm qhov ceev warp thiab weft thiab cov qauv ntawm cov iav fiber xov.
1.5.2 Daim Iav Ribbon
Cov iav ribbon feem ntau muab faib ua ob pawg, thawj hom yog selvedge, qhov thib ob hom yog tsis-woven selvedge, uas yog woven raws li tus qauv ntawm cov weave dawb. Cov iav ribbons tuaj yeem siv rau cov khoom siv hluav taws xob uas xav tau cov khoom dielectric siab. Cov khoom siv hluav taws xob muaj zog siab.
1.5.3 Cov ntaub ib sab
Cov ntaub ib txoj kev hauv lub neej txhua hnub yog xaws los ntawm ob txoj xov ntawm ntau qhov tuab sib txawv, thiab cov ntaub uas tshwm sim muaj lub zog siab hauv qhov kev taw qhia tseem ceeb.
1.5.4 Cov ntaub peb sab
Cov ntaub peb-seem no txawv ntawm cov qauv ntawm cov ntaub dav hlau, nws yog peb-seem, yog li nws cov nyhuv zoo dua li cov fiber dav hlau dav dav. Cov khoom siv sib xyaw ua ke peb-seem fiber muaj qhov zoo uas lwm cov ntaub ntawv sib xyaw ua ke fiber tsis muaj. Vim tias cov fiber yog peb-seem, qhov cuam tshuam tag nrho zoo dua, thiab kev tiv thaiv kev puas tsuaj yuav muaj zog dua. Nrog rau kev txhim kho ntawm kev tshawb fawb thiab thev naus laus zis, qhov kev thov nce ntxiv rau nws hauv kev tsav dav hlau, tsheb thiab nkoj tau ua rau cov thev naus laus zis no laus zuj zus, thiab tam sim no nws txawm nyob hauv qhov chaw hauv kev ua kis las thiab cov khoom siv kho mob. Cov ntaub peb-seem feem ntau yog muab faib ua tsib pawg, thiab muaj ntau yam duab. Nws tuaj yeem pom tias qhov chaw tsim kho ntawm cov ntaub peb-seem yog loj heev.
1.5.5 Cov ntaub zoo li tus
Cov ntaub zoo li no yog siv los txhawb cov khoom sib xyaw, thiab lawv cov duab feem ntau nyob ntawm cov duab ntawm cov khoom uas yuav tsum tau txhawb, thiab, txhawm rau kom ua raws li txoj cai, yuav tsum tau xaws rau ntawm lub tshuab tshwj xeeb. Hauv kev tsim khoom, peb tuaj yeem ua cov duab zoo sib xws lossis tsis zoo sib xws nrog cov kev txwv qis thiab muaj kev cia siab zoo.
1.5.6 Cov ntaub grooved core
Kev tsim cov ntaub groove core kuj yooj yim heev. Ob txheej ntaub raug muab tso rau hauv parallel, thiab tom qab ntawd lawv tau txuas nrog cov kab ntsug ntsug, thiab lawv cov cheeb tsam hla-sectional tau lees tias yuav yog cov duab peb ceg lossis cov duab plaub ceg.
1.5.7 Cov ntaub fiberglass xaws
Nws yog ib daim ntaub tshwj xeeb heev, tib neeg kuj hu nws ua daim ntaub knitted thiab daim ntaub woven, tab sis nws tsis yog daim ntaub thiab daim ntaub lev raws li peb paub nws hauv lub ntsiab lus ib txwm muaj. Nws tsim nyog hais tias muaj ib daim ntaub stitched, uas tsis yog woven ua ke los ntawm warp thiab weft, tab sis yog overlaped los ntawm warp thiab weft.
1.5.8 Lub tes tsho fiberglass insulating
Cov txheej txheem tsim khoom yooj yim heev. Ua ntej, qee cov xov iav fiber raug xaiv, thiab tom qab ntawd lawv raug xaws ua ib lub raj. Tom qab ntawd, raws li qhov xav tau ntawm qib rwb thaiv tsev sib txawv, cov khoom xav tau raug tsim los ntawm kev txheej lawv nrog cov resin.
1.6 Kev sib xyaw ua ke ntawm cov iav fiber
Nrog rau kev loj hlob sai ntawm kev tshawb fawb thiab thev naus laus zis, cov thev naus laus zis iav fiber kuj tau ua tiav zoo heev, thiab ntau yam khoom siv iav fiber tau tshwm sim txij li xyoo 1970 txog rau tam sim no. Feem ntau muaj cov hauv qab no:
(1) Cov ntaub pua plag txiav + cov ntaub pua plag tsis sib ntswg + cov ntaub pua plag txiav
(2) Cov ntaub tsis sib ntswg + cov ntaub lev txiav
(3) Cov ntaub pua plag txiav + cov ntaub pua plag txuas ntxiv + cov ntaub pua plag txiav
(4) Random roving + chopped thawj qhov piv lev
(5) Cov roj carbon fiber ib sab + cov ntaub lev lossis daim ntaub txiav
(6) Daim ntaub pua plag + cov xov txiav
(7) Daim ntaub iav + daim iav nyias nyias lossis kev roving unidirectional + daim ntaub iav
1.7 Cov iav fiber tsis-woven ntaub
Cov thev naus laus zis no tsis tau pom thawj zaug hauv kuv lub tebchaws. Cov thev naus laus zis thaum ub tshaj plaws tau tsim tawm hauv Tebchaws Europe. Tom qab ntawd, vim yog tib neeg tsiv teb tsaws chaw, cov thev naus laus zis no tau coj mus rau Tebchaws Meskas, Kaus Lim Qab Teb thiab lwm lub tebchaws. Txhawm rau txhawb kev txhim kho ntawm kev lag luam iav fiber, kuv lub tebchaws tau tsim ntau lub Hoobkas loj thiab nqis peev ntau rau kev tsim ntau cov kab ntau lawm. Hauv kuv lub tebchaws, cov ntaub pua plag ntub dej iav feem ntau muab faib ua pawg hauv qab no:
(1) Cov lev ru tsev ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom ntawm cov asphalt membranes thiab cov xim asphalt shingles, ua rau lawv zoo dua.
(2) Cov yeeb nkab lev: Ib yam li lub npe, cov khoom no feem ntau yog siv rau hauv cov kav dej. Vim tias cov iav fiber yog corrosion-resistant, nws tuaj yeem tiv thaiv cov kav dej los ntawm corrosion.
(3) Lub lev saum npoo feem ntau yog siv rau ntawm qhov chaw ntawm FRP cov khoom los tiv thaiv nws.
(4) Cov lev veneer feem ntau yog siv rau phab ntsa thiab qab nthab vim nws tuaj yeem tiv thaiv cov xim kom tsis txhob tawg. Nws tuaj yeem ua rau phab ntsa tiaj tus thiab tsis tas yuav txiav ntau xyoo.
(5) Cov ntaub pua plag hauv pem teb feem ntau yog siv ua cov khoom siv hauv paus hauv PVC pem teb
(6) Cov ntaub pua plag; ua cov khoom siv hauv paus hauv cov ntaub pua plag.
(7) Daim lev tooj liab clad laminate txuas rau daim laminate tooj liab clad tuaj yeem txhim kho nws qhov kev xuas nrig thiab kev ua haujlwm drilling.
2 Cov ntawv thov tshwj xeeb ntawm cov iav fiber
2.1 Lub hauv paus ntsiab lus ntawm cov iav fiber reinforced concrete
Lub hauv paus ntsiab lus ntawm cov iav fiber reinforced concrete zoo ib yam li cov iav fiber composite composite. Ua ntej tshaj plaws, ntxiv cov iav fiber rau hauv cov pob zeb, cov iav fiber yuav dais qhov kev ntxhov siab sab hauv ntawm cov khoom, yog li ntawd ncua lossis tiv thaiv kev nthuav dav ntawm cov kab nrib pleb me me. Thaum lub sijhawm tsim cov kab nrib pleb hauv cov pob zeb, cov khoom ua lub luag haujlwm ua cov khoom sib sau ua ke yuav tiv thaiv qhov tshwm sim ntawm cov kab nrib pleb. Yog tias cov nyhuv sib sau ua ke zoo txaus, cov kab nrib pleb yuav tsis tuaj yeem nthuav dav thiab nkag mus. Lub luag haujlwm ntawm cov iav fiber hauv cov pob zeb yog cov khoom sib sau ua ke, uas tuaj yeem tiv thaiv kev tsim thiab nthuav dav ntawm cov kab nrib pleb. Thaum cov kab nrib pleb nthuav dav mus rau thaj tsam ntawm cov iav fiber, cov iav fiber yuav thaiv kev nce qib ntawm cov kab nrib pleb, yog li yuam kom cov kab nrib pleb mus ncig, thiab ua raws li, thaj chaw nthuav dav ntawm cov kab nrib pleb yuav nce ntxiv, yog li lub zog xav tau rau kev puas tsuaj kuj yuav nce ntxiv.
2.2 Txoj kev rhuav tshem ntawm cov iav fiber reinforced concrete
Ua ntej cov iav fiber reinforced concrete tawg, lub zog tensile uas nws dais feem ntau yog sib koom los ntawm cov pob zeb thiab cov iav fiber. Thaum lub sijhawm tawg, qhov kev ntxhov siab yuav raug xa mus los ntawm cov pob zeb mus rau cov iav fiber uas nyob ib sab. Yog tias lub zog tensile txuas ntxiv nce ntxiv, cov iav fiber yuav raug puas tsuaj, thiab cov txheej txheem kev puas tsuaj feem ntau yog kev puas tsuaj shear, kev puas tsuaj tension, thiab kev puas tsuaj rub tawm.
2.2.1 Kev txiav tsis ua haujlwm
Lub zog shear uas cov iav fiber reinforced concrete nqa tau yog sib koom los ntawm cov iav fiber thiab cov pob zeb ua vaj tse, thiab lub zog shear yuav raug xa mus rau cov iav fiber los ntawm cov pob zeb ua vaj tse, yog li ntawd cov qauv iav fiber yuav raug puas tsuaj. Txawm li cas los xij, iav fiber muaj nws tus kheej qhov zoo. Nws muaj qhov ntev ntev thiab thaj chaw tiv thaiv shear me me, yog li kev txhim kho ntawm kev tiv thaiv shear ntawm iav fiber tsis muaj zog.
2.2.2 Kev tsis ua haujlwm ntawm kev ntxhov siab
Thaum lub zog tensile ntawm cov iav fiber ntau dua li ib qib, cov iav fiber yuav tawg. Yog tias cov pob zeb tawg, cov iav fiber yuav ntev dhau vim yog tensile deformation, nws cov ntim sab nraud yuav ntsws, thiab lub zog tensile yuav tawg sai dua.
2.2.3 Kev puas tsuaj los ntawm kev rub tawm
Thaum cov pob zeb tawg, lub zog tensile ntawm cov iav fiber yuav raug txhim kho ntau heev, thiab lub zog tensile yuav loj dua lub zog ntawm cov iav fiber thiab cov pob zeb, yog li ntawd cov iav fiber yuav raug puas tsuaj thiab tom qab ntawd raug rub tawm.
2.3 Cov khoom siv flexural ntawm cov iav fiber reinforced concrete
Thaum cov pob zeb ua vaj tse uas muaj hlau txhawb nqa lub nra hnyav, nws cov kab nkhaus kev ntxhov siab-kev ntxhov siab yuav raug muab faib ua peb theem sib txawv los ntawm kev tshuaj xyuas tshuab, raws li pom hauv daim duab. Theem thawj zaug: kev hloov pauv elastic tshwm sim ua ntej kom txog thaum pib tawg. Lub ntsiab lus tseem ceeb ntawm theem no yog tias kev hloov pauv nce linearly mus txog rau qhov chaw A, uas sawv cev rau lub zog tawg pib ntawm cov iav fiber reinforced concrete. Theem thib ob: thaum cov pob zeb tawg, lub nra hnyav uas nws ris yuav raug xa mus rau cov fibers sib ze kom ris, thiab lub peev xwm dais tau txiav txim siab raws li cov iav fiber nws tus kheej thiab lub zog sib txuas nrog cov pob zeb. Point B yog lub zog flexural kawg ntawm cov iav fiber reinforced concrete. Theem thib peb: mus txog lub zog kawg, cov iav fiber tawg lossis raug rub tawm, thiab cov fibers seem tseem tuaj yeem dais ib feem ntawm lub nra hnyav kom ntseeg tau tias kev tawg brittle yuav tsis tshwm sim.
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Lub sijhawm tshaj tawm: Lub Xya Hli-06-2022
