1 Daim ntawv thov tseem ceeb
Lub untwisted roving uas tib neeg tuaj rau hauv kev sib cuag nrog nyob rau hauv lub neej niaj hnub muaj ib tug yooj yim qauv thiab yog ua los ntawm parallel monofilaments sib sau ua ke. Untwisted roving tuaj yeem muab faib ua ob hom: alkali-dawb thiab nruab nrab-alkali, uas feem ntau txawv raws li qhov sib txawv ntawm iav muaj pes tsawg leeg. Txhawm rau tsim cov iav rovings 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 ntawm qee cov ntaub ntawv sib xyaw, xws li cov txheej txheem winding thiab pultrusion. Thiab nws tseem tuaj yeem tau woven rau hauv roving fabrics, feem ntau yog vim nws nruj heev. Tsis tas li ntawd, daim teb ntawm daim ntawv thov ntawm chopped roving kuj yog dav heev.
1.1.1Twistless roving rau jetting
Hauv FRP txhaj tshuaj molding txheej txheem, lub twistless roving yuav tsum muaj cov khoom nram qab no:
(1) Txij li kev txiav txuas ntxiv yuav tsum tau ua hauv kev tsim khoom, nws yog ib qho tsim nyog los xyuas kom meej tias tsis tshua muaj hluav taws xob zoo li qub thaum txiav, uas yuav tsum tau ua haujlwm zoo.
(2) Tom qab txiav, ntau npaum li cas raw cov ntaub ntawv yog guaranteed yuav tsum tau ua, yog li ntawd cov efficiency ntawm txhob lo lo ntxhuav txoj kev yog guaranteed siab. Lub efficiency ntawm dispersing lub roving rau hauv strands tom qab txiav yog siab dua.
(3) Tom qab txiav, kom ntseeg tau tias cov xov paj nyoos tuaj yeem npog tag nrho ntawm cov pwm, cov xov paj nyoos yuav tsum muaj cov txheej txheem zoo.
(4) Vim tias nws yuav tsum tau yooj yim rau dov ca kom yob tawm cov npuas npuas, nws yuav tsum tau nkag mus rau hauv cov resin sai heev.
(5) Vim yog cov qauv sib txawv ntawm ntau yam phom phom, txhawm rau kom haum cov phom sib txawv, xyuas kom meej tias cov tuab ntawm cov hlau nyoos yog nruab nrab.
SMC, tseem hu ua daim ntawv molding compound, tuaj yeem pom nyob txhua qhov chaw hauv lub neej, xws li cov khoom siv paub zoo, cov chav da dej thiab ntau lub rooj zaum uas siv SMC roving. Hauv kev tsim khoom, muaj ntau qhov kev xav tau rau kev rov ua haujlwm rau SMC. Nws yog ib qho tsim nyog los xyuas kom zoo choppiness, zoo antistatic zog, thiab cov ntaub plaub tsawg dua kom ntseeg tau tias SMC daim ntawv tsim tau tsim nyog. Rau cov xim SMC, cov kev cai rau kev rov qab sib txawv, thiab nws yuav tsum yooj yim nkag mus rau hauv cov resin nrog cov ntsiab lus xim. Feem ntau, cov fiberglass SMC roving yog 2400tex, thiab kuj muaj ob peb qhov uas nws yog 4800tex.
1.1.3Untwisted roving rau winding
Txhawm rau ua kom FRP kav nrog cov thicknesses sib txawv, cov txheej txheem cia tank winding tau los ua. Rau kev rov qab 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 nyob rau hauv cov duab ntawm ib daim kab xev.
(2) Txij li thaum lub dav dav untwisted roving yog feem ntau ntog tawm ntawm lub voj thaum nws raug tshem tawm ntawm lub bobbin, nws yuav tsum tau xyuas kom meej tias nws degradability kuj zoo, thiab cov resulting txhob lo lo ntxhuav yuav tsis nkim li ib tug noog lub zes.
(3) Qhov nro tsis tuaj yeem loj lossis me me, thiab qhov tshwm sim ntawm overhang tsis tuaj yeem tshwm sim.
(4) Qhov kev xav tau linear ceev rau untwisted roving yuav tsum tsis sib xws thiab tsawg dua tus nqi teev.
(5) Txhawm rau kom ntseeg tau tias nws yooj yim rau wetted thaum dhau los ntawm lub tank resin, qhov permeability ntawm roving yuav tsum tau zoo.
Cov txheej txheem pultrusion yog dav siv nyob rau hauv kev tsim khoom ntawm ntau yam profiles nrog zoo ib yam cross-sections. Roving rau pultrusion yuav tsum xyuas kom meej tias nws cov iav fiber ntau cov ntsiab lus thiab lub zog unidirectional nyob rau theem siab. Lub roving rau pultrusion siv nyob rau hauv ntau lawm yog ib tug ua ke ntawm ntau yam strands ntawm raw cov ntaub so ntswg, thiab ib co kuj yuav ncaj rovings, ob qho tib si uas yog ua tau. Nws lwm yam kev ua tau zoo yuav tsum zoo ib yam li cov winding rovings.
1.1.5 Twistless Roving rau Weaving
Nyob rau hauv lub neej niaj hnub, peb pom gingham fabrics nrog txawv thicknesses los yog roving fabrics nyob rau hauv tib txoj kev coj, uas yog lub embodiment ntawm lwm yam tseem ceeb siv roving, uas yog siv rau weaving. Roving siv kuj hu ua roving rau weaving. Feem ntau ntawm cov ntaub no tseem ceeb hauv tes nteg FRP molding. Rau weaving rovings, cov hauv qab no yuav tsum tau ua raws li:
(1) Nws yog qhov hnav-resistant.
(2) Yooj yim rau daim kab xev.
(3) Vim nws tsuas yog siv rau kev xaws, yuav tsum muaj cov kauj ruam kom qhuav ua ntej weaving.
(4) Nyob rau hauv cov nqe lus ntawm nro, nws yog ib qho tseem ceeb kom ntseeg tau tias nws tsis tuaj yeem loj lossis me me, thiab nws yuav tsum tau khaws cia zoo ib yam. Thiab ua tau raws li tej yam kev mob nyob rau hauv cov nqe lus ntawm overhang.
(5) Degradability zoo dua.
(6) Nws yog ib qho yooj yim rau infiltrated los ntawm resin thaum dhau los ntawm resin tank, yog li cov permeability yuav tsum zoo.
1.1.6 Twistless roving rau preform
Cov txheej txheem hu ua preform, feem ntau hais lus, yog pre-forming, thiab cov khoom tau txais tom qab tsim nyog cov kauj ruam. Hauv kev tsim khoom, peb ua ntej chop lub roving, thiab tshuaj tsuag cov chopped roving ntawm lub vas, qhov twg lub net yuav tsum yog ib lub vas nrog cov duab predetermined. Tom qab ntawd tsuag cov resin kom zoo. Thaum kawg, cov khoom zoo li no tau muab tso rau hauv pwm, thiab cov resin txhaj thiab tom qab ntawd kub nias kom tau txais cov khoom. Cov kev xav tau ntawm kev ua haujlwm rau preform rovings zoo ib yam li cov dav hlau rovings.
1.2 iav fiber roving ntaub
Muaj ntau cov ntaub roving, thiab gingham yog ib qho ntawm lawv. Nyob rau hauv tes nteg-up FRP txheej txheem, gingham yog dav siv raws li qhov tseem ceeb tshaj plaws substrate. Yog tias koj xav ua kom lub zog ntawm cov gingham, ces koj yuav tsum tau hloov lub warp thiab weft kev taw qhia ntawm cov ntaub, uas tuaj yeem hloov mus rau hauv unidirectional gingham. Txhawm rau kom ntseeg tau qhov zoo ntawm daim ntaub checkered, cov yam ntxwv hauv qab no yuav tsum tau lav.
(1) Rau cov ntaub, nws yuav tsum tau tiaj tus tag nrho, tsis muaj bulges, cov npoo thiab cov ces kaum yuav tsum ncaj, thiab yuav tsum tsis txhob muaj qhov qias neeg.
(2) Qhov ntev, qhov dav, qhov zoo, qhov hnyav thiab qhov ntom ntawm cov ntaub yuav tsum ua tau raws li cov qauv.
(3) Cov iav fiber ntau filaments yuav tsum tau dov kom zoo.
(4) Yuav kom muaj peev xwm nkag tau sai ntawm cov resin.
(5) Lub dryness thiab humidity ntawm fabrics woven rau hauv ntau yam khoom yuav tsum tau raws li tej yam yuav tsum tau.
1.3 iav fiber ntau lev
1.3.1Txiav strand lev
Ua ntej chop lub iav strands thiab nphoo lawv rau ntawm txoj siv mesh npaj. Tom qab ntawd sprinkle lub binder rau nws, sov nws kom yaj, thiab ces txias nws kom solidify, thiab tws strand lev yog tsim. Chopped strand fiber mats yog siv nyob rau hauv tes nteg txheej txheem thiab nyob rau hauv lub weaving ntawm SMC daim nyias nyias. Yuav kom ua tiav qhov zoo tshaj plaws siv cov nyhuv ntawm tws strand lev, nyob rau hauv ntau lawm, cov kev cai rau tws strand lev yog raws li nram no.
(1) Tag nrho cov chopped strand lev yog tiaj tus thiab txawm.
(2) Lub qhov ntawm cov chopped strand lev yog me me thiab sib xws
(4) Ua tau raws li cov qauv.
(5) Nws tuaj yeem saturated nrog resin.
1.3.2 Nruam strand lev
Cov iav strands tau muab tso rau ntawm txoj siv mesh raws li qee qhov yuav tsum tau ua. Feem ntau, cov neeg hais tias lawv yuav tsum tau muab tso rau hauv ib daim duab ntawm 8. Ces sprinkle hmoov nplaum rau saum thiab cua sov los kho. Nruam strand mats yog qhov zoo tshaj plaws rau kev sib tw strand mats hauv kev txhawb nqa cov khoom sib xyaw, feem ntau vim tias cov iav fibers hauv cov strand mats txuas ntxiv mus. Vim nws txoj kev txhim kho zoo dua qub, nws tau siv ntau yam txheej txheem.
1.3.3Nto Mat
Daim ntawv thov ntawm cov lev saum npoo kuj muaj nyob rau hauv lub neej txhua hnub, xws li cov txheej txheej ntawm FRP cov khoom, uas yog nruab nrab alkali iav nto lev. Siv FRP ua piv txwv, vim tias nws cov lev saum npoo yog ua los ntawm cov iav nruab nrab alkali, nws ua rau FRP tshuaj ruaj khov. Nyob rau tib lub sijhawm, vim tias cov lev saum npoo yog lub teeb thiab nyias, nws tuaj yeem nqus tau ntau cov resin, uas tuaj yeem tsis tsuas yog ua lub luag haujlwm tiv thaiv tab sis kuj ua lub luag haujlwm zoo nkauj.
1.3.4Koob lev
Koob lev feem ntau muab faib ua ob pawg, thawj qeb yog tws fiber ntau rab koob punching. Cov txheej txheem tsim khoom yog qhov yooj yim, thawj zaug chop lub iav fiber ntau, qhov loj me yog li 5 cm, randomly nphoo nws ntawm cov khoom siv hauv paus, tom qab ntawd muab cov substrate rau ntawm txoj siv conveyor, thiab tom qab ntawd tho lub substrate nrog rab koob crochet, vim yog cov khoom siv. Cov nyhuv ntawm crochet koob, Cov fibers yog pierced rau hauv lub substrate thiab ces provoked los ua ib tug peb-seem qauv. Cov substrate xaiv kuj muaj qee qhov kev xav tau thiab yuav tsum muaj qhov xav tau fluffy. Koob lev khoom siv dav siv hauv suab rwb thaiv tsev thiab thermal rwb thaiv tsev cov ntaub ntawv raws li lawv cov khoom. Tau kawg, nws tseem tuaj yeem siv tau hauv FRP, tab sis nws tsis tau nrov vim tias cov khoom tau txais muaj lub zog qis thiab muaj feem cuam tshuam. Lwm hom yog hu ua nruam filament koob-punched lev, thiab cov txheej txheem ntau lawm kuj yooj yim heev. Ua ntej, lub filament yog random pov rau ntawm lub mesh siv npaj ua ntej nrog ib tug hlau ntuav ntaus ntawv. Ib yam li ntawd, ib rab koob crochet yog coj mus rau acupuncture los ua ib qho qauv ntawm peb sab. Nyob rau hauv iav fiber reinforced thermoplastics, nruam strand koob mats yog zoo siv.
Cov hlais iav fibers tuaj yeem hloov pauv mus rau ob qhov sib txawv ntawm qhov ntev ntev los ntawm kev ua haujlwm stitching ntawm lub tshuab stitchbonding. Thawj zaug yog los ua ib qho kev sib tw strand lev, uas zoo hloov cov hlua khi-cov hlua khi hlua khi. Qhov thib ob yog qhov ntev-fiber lev, uas hloov lub nruam strand lev. Ob daim ntawv sib txawv no muaj qhov zoo sib xws. Lawv tsis siv cov nplaum nplaum hauv cov txheej txheem tsim khoom, tsis txhob muaj kuab paug thiab pov tseg, thiab txaus siab rau tib neeg txoj kev nrhiav kev txuag nyiaj thiab kev tiv thaiv ib puag ncig.
1.4 Milled fibers
Cov txheej txheem ntawm cov av fiber ntau yog yooj yim heev. Siv ib lub rauj zeb los yog ib lub pob zeb thiab muab tws fibers rau hauv nws. Sib tsoo thiab sib tsoo fibers kuj muaj ntau yam kev siv hauv kev tsim khoom. Hauv cov txheej txheem kev txhaj tshuaj, cov milled fiber ntau ua raws li cov khoom siv txhawb zog, thiab nws qhov kev ua tau zoo zoo dua li ntawm lwm cov fibers. Txhawm rau kom tsis txhob muaj kab nrib pleb thiab txhim kho shrinkage hauv kev tsim cov khoom cam khwb cia thiab molded, milled fibers tuaj yeem siv los ua cov khoom ntim.
1.5 Fiberglass ntaub
1.5.1Cov ntaub iav
Nws belongs rau ib hom iav fiber ntau ntaub. Cov ntaub iav uas tsim nyob rau hauv ntau qhov chaw muaj cov qauv sib txawv. Hauv daim teb ntawm cov ntaub iav hauv kuv lub teb chaws, nws feem ntau muab faib ua ob hom: alkali-dawb iav ntaub thiab nruab nrab alkali iav ntaub. Daim ntawv thov ntawm daim ntaub iav tuaj yeem hais tias nws yog qhov dav heev, thiab lub cev ntawm lub tsheb, lub hull, lub tank cia, thiab lwm yam tuaj yeem pom hauv daim duab ntawm alkali-dawb iav ntaub. Rau nruab nrab alkali iav ntaub, nws corrosion kuj zoo dua, yog li nws yog dav siv nyob rau hauv zus tau tej cov ntim thiab corrosion-resistant khoom. Txhawm rau txiav txim siab cov yam ntxwv ntawm cov iav fiber ntau, nws yog qhov tsim nyog yuav tsum pib ntawm plaub yam, cov khoom ntawm cov fiber ntau nws tus kheej, cov qauv ntawm cov iav fiber ntau, cov warp thiab weft kev taw qhia thiab cov qauv ntaub. Nyob rau hauv lub warp thiab weft kev taw qhia, qhov ceev nyob ntawm tus qauv sib txawv ntawm cov xov paj thiab cov qauv ntaub. Lub cev lub cev ntawm cov ntaub yog nyob ntawm warp thiab weft ceev thiab cov qauv ntawm cov iav fiber ntau xov paj.
1.5.2 iav Ribbon
Cov iav ribbon feem ntau yog muab faib ua ob pawg, thawj hom yog selvedge, hom thib ob yog non-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 siv hluav taws xob siab. Cov khoom siv hluav taws xob muaj zog heev.
1.5.3 Unidirectional ntaub
Unidirectional fabrics nyob rau hauv lub neej txhua hnub yog woven los ntawm ob yarns ntawm txawv thicknesses, thiab lub resulting fabrics muaj siab zog nyob rau hauv lub ntsiab kev taw qhia.
1.5.4 Peb-dimensional ntaub
Cov ntaub peb-dimensional yog txawv ntawm cov qauv ntawm lub dav hlau ntaub, nws yog peb-dimensional, yog li nws cov nyhuv zoo dua li dav dav fiber ntau. Peb-dimensional fiber-reinforced composite khoom muaj qhov zoo uas lwm cov ntaub ntawv fiber ntau-reinforced composite tsis muaj. Vim hais tias cov fiber ntau yog peb-dimensional, tag nrho cov nyhuv yog zoo dua, thiab kev puas tsuaj kuj yuav muaj zog. Nrog rau txoj kev loj hlob ntawm kev tshawb fawb thiab thev naus laus zis, kev xav tau ntau ntxiv rau nws hauv aerospace, tsheb thiab nkoj tau ua rau cov cuab yeej no ntau dua thiab paub tab, thiab tam sim no nws txawm nyob hauv thaj chaw ntawm kev ua kis las thiab khoom siv kho mob. Peb-dimensional npuag hom feem ntau muab faib ua tsib pawg, thiab muaj ntau yam duab. Nws tuaj yeem pom tias qhov chaw loj hlob ntawm cov ntaub ntawv peb sab yog loj heev.
1.5.5 Puab ntaub
Cov ntaub npuag yog siv los txhawb cov ntaub ntawv sib xyaw, thiab lawv cov duab feem ntau yog nyob ntawm qhov zoo ntawm cov khoom yuav tsum tau ntxiv dag zog, thiab, txhawm rau kom ua raws li, yuav tsum tau woven ntawm lub tshuab siab. Hauv kev tsim khoom, peb tuaj yeem ua cov duab symmetrical lossis asymmetrical nrog cov kev txwv tsawg thiab cov kev cia siab zoo
1.5.6 Grooved core ntaub
Lub fabrication ntawm groove core ntaub kuj kuj yooj yim. Ob txheej ntawm cov ntaub yog muab tso rau hauv qhov sib npaug, thiab tom qab ntawd lawv txuas nrog cov kab ntsug ntsug, thiab lawv qhov chaw hla ntu tau lees paub tias yog daim duab peb sab lossis cov duab plaub.
1.5.7 Fiberglass stitched ntaub
Nws yog cov ntaub tshwj xeeb heev, tib neeg kuj hu nws knitted lev thiab woven lev, tab sis nws tsis yog ntaub thiab lev raws li peb paub nws nyob rau hauv lub niaj zaus kev nkag siab. Nws yog tsim nyog hais tias muaj ib tug stitched ntaub, uas tsis yog woven ua ke los ntawm warp thiab weft, tab sis yog alternated overlapped los warp thiab weft. :
1.5.8 Fiberglass insulating lub tes tsho
Cov txheej txheem ntau lawm kuj yooj yim. Ua ntej, qee cov iav fiber ntau yog xaiv, thiab tom qab ntawd lawv tau woven rau hauv cov duab tubular. Tom qab ntawd, raws li cov kev xav tau ntawm cov qib rwb thaiv tsev sib txawv, cov khoom xav tau yog tsim los ntawm txheej txheej nrog resin.
1.6 iav fiber ntau ua ke
Nrog rau kev loj hlob sai ntawm kev tshawb fawb thiab thev naus laus zis kev nthuav qhia, iav fiber ntau thev naus laus zis kuj tau ua tiav tseem ceeb, thiab ntau yam khoom siv iav fiber ntau tau tshwm sim txij li xyoo 1970 txog rau tam sim no. Feem ntau, muaj cov hauv qab no:
(1) Chopped strand lev + untwisted roving + tws strand lev
(2) Untwisted roving ntaub + tws strand lev
(3) Chopped strand lev + nruam strand lev + tws strand lev
(4) Random roving + tws thawj piv lev
(5) Unidirectional carbon fiber + tws strand lev lossis ntaub
(6) Nto lev + tws strands
(7) Cov ntaub iav + iav nyias pas lossis unidirectional roving + iav ntaub
1.7 iav fiber ntau tsis-woven ntaub
Cov tshuab no tsis tau pom thawj zaug hauv kuv lub tebchaws. Cov thev naus laus zis tshaj plaws tau tsim nyob hauv Europe. Tom qab ntawd, vim tib neeg tsiv teb tsaws chaw, cov cuab yeej no tau coj mus rau Tebchaws Meskas, Kaus Lim Qab Teb thiab lwm lub tebchaws. Txhawm rau txhawb txoj kev loj hlob ntawm kev lag luam iav fiber ntau, kuv lub teb chaws tau tsim ntau lub tuam txhab loj thiab tau nqis peev ntau hauv kev tsim ntau cov kab ntau lawm. . Hauv kuv lub tebchaws, cov iav fiber ntau ntub-ntoo mats feem ntau muab faib ua pawg hauv qab no:
(1) Roofing lev plays lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom ntawm asphalt membranes thiab cov xim asphalt shingles, ua rau lawv zoo heev.
(2) Yeeb nkab lev: Ib yam li lub npe, cov khoom no yog siv hauv cov kav dej. Vim iav fiber ntau yog corrosion-resistant, nws tuaj yeem tiv thaiv cov kav dej los ntawm corrosion.
(3) Cov lev saum npoo yog siv rau saum npoo ntawm cov khoom FRP los tiv thaiv nws.
(4) Lub veneer lev feem ntau yog siv rau phab ntsa thiab qab nthab vim nws tuaj yeem tiv thaiv cov xim tsis txhob tawg. Nws tuaj yeem ua rau cov phab ntsa tiaj tus thiab yuav tsum tsis txhob muab txiav rau ntau xyoo.
(5) Pem teb lev feem ntau yog siv los ua cov khoom siv hauv PVC pem teb
(6) Cov ntaub pua plag; raws li cov khoom siv hauv cov ntaub pua plag.
(7) Cov tooj liab clad laminate lev txuas nrog tooj liab clad laminate tuaj yeem txhim kho nws cov xuas nrig ntaus thiab kev ua haujlwm drilling.
2 Kev siv tshwj xeeb ntawm iav fiber ntau
2.1 Txhim kho txoj cai ntawm iav fiber reinforced pob zeb
Lub hauv paus ntsiab lus ntawm iav fiber reinforced qhob yog zoo ib yam li cov iav fiber reinforced composite cov ntaub ntawv. Ua ntej tshaj plaws, ntxiv cov iav fiber ntau rau cov pob zeb, cov iav fiber ntau yuav dais qhov kev ntxhov siab sab hauv ntawm cov khoom, kom ncua lossis tiv thaiv kev nthuav dav ntawm micro-cracks. Thaum lub sij hawm tsim cov pob zeb tawg, cov khoom siv ua ke yuav tiv thaiv qhov tshwm sim ntawm cov kab nrib pleb. Yog tias qhov sib xyaw ua ke zoo txaus, cov kab nrib pleb yuav tsis tuaj yeem nthuav dav thiab nkag mus. Lub luag haujlwm ntawm iav fiber ntau hauv pob zeb yog sib sau ua ke, uas tuaj yeem tiv thaiv kev tsim thiab nthuav tawm ntawm cov kab nrib pleb. Thaum cov kab nrib pleb kis mus rau ib puag ncig ntawm cov iav fiber ntau, cov iav fiber ntau yuav thaiv qhov kev txhim kho ntawm cov kab nrib pleb, yog li yuam kom tawg mus rau ib qho kev taw qhia, thiab sib txuas, thaj tsam ntawm qhov tawg yuav nce ntxiv, yog li lub zog xav tau rau kev puas tsuaj kuj yuav nce ntxiv.
2.2 Kev puas tsuaj mechanism ntawm iav fiber reinforced pob zeb
Ua ntej cov iav fiber reinforced pob zeb tawg, lub zog tensile nws dais yog feem ntau sib koom los ntawm cov pob zeb thiab cov iav fiber ntau. Thaum lub sijhawm txheej txheem tawg, qhov kev ntxhov siab yuav kis tau los ntawm cov pob zeb mus rau cov iav fiber ntau uas nyob ib sab. Yog tias lub zog tensile tseem nce ntxiv, cov iav fiber ntau yuav raug puas tsuaj, thiab txoj kev puas tsuaj feem ntau yog shear puas, nro puas, thiab rub tawm puas.
2.2.1 Shear tsis ua hauj lwm
Kev ntxhov siab shear los ntawm cov iav fiber reinforced pob zeb yog sib koom los ntawm cov iav fiber ntau thiab cov pob zeb, thiab cov kev ntxhov siab shear yuav raug xa mus rau cov iav fiber ntau los ntawm cov pob zeb, kom cov iav fiber ntau yuav puas. Txawm li cas los xij, iav fiber ntau muaj nws tus kheej zoo. Nws muaj qhov ntev ntev thiab me me shear resistance cheeb tsam, yog li kev txhim kho ntawm shear resistance ntawm iav fiber yog tsis muaj zog.
2.2.2 Kev ntxhov siab tsis ua haujlwm
Thaum lub zog tensile ntawm iav fiber ntau dua li ib theem, cov iav fiber ntau yuav tawg. Yog tias cov pob zeb tawg, cov iav fiber ntau yuav ntev dhau los vim yog tensile deformation, nws cov ntim sab nraud yuav ntsws, thiab lub zog tensile yuav tawg sai dua.
2.2.3 Pull-off puas
Thaum cov pob zeb tawg lawm, lub zog tensile ntawm cov iav fiber ntau yuav ua tau zoo heev, thiab lub zog tensile yuav ntau dua li lub zog ntawm cov iav fiber ntau thiab cov pob zeb, yog li ntawd cov iav fiber ntau yuav raug puas tsuaj thiab ces rub tawm.
2.3 Flexural zog ntawm iav fiber reinforced pob zeb
Thaum lub pob zeb muaj zog txhawb nqa lub nra, nws txoj kev ntxhov siab-txhim kho qhov nkhaus yuav muab faib ua peb theem sib txawv los ntawm kev tsom xam, raws li qhia hauv daim duab. Thawj theem: elastic deformation tshwm sim ua ntej kom txog thaum pib tawg. Lub ntsiab feature ntawm cov theem no yog qhov deformation nce linearly mus txog rau thaum point A, uas sawv cev rau qhov pib tawg lub zog ntawm iav fiber reinforced pob zeb. Qhov thib ob theem: ib zaug cov pob zeb tawg, lub load nws dais yuav raug xa mus rau cov kab uas nyob ib sab mus dais, thiab cov kabmob muaj peev xwm txiav txim siab raws li cov iav fiber ntau nws tus kheej thiab lub zog sib txuas nrog cov pob zeb. Point B yog qhov kawg flexural zog ntawm iav fiber reinforced pob zeb. Qhov thib peb theem: mus txog qhov kawg ntawm lub zog, lub iav fiber ntau tawg los yog raug rub tawm, thiab cov fibers uas tseem tshuav tseem tuaj yeem dais ib feem ntawm qhov kev thauj khoom kom ntseeg tau tias cov pob txha tawg yuav tsis tshwm sim.
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Post lub sij hawm: Jul-06-2022
