Cov khoom siv txhawb zog yog cov pob txha txhawb nqa ntawm FRP cov khoom, uas pib txiav txim siab lub zog ntawm cov khoom pultruded. Kev siv cov khoom siv txhawb zog kuj muaj qee yam cuam tshuam rau kev txo qis ntawm cov khoom lag luam thiab ua kom cov thermal deformation kub thiab kub tsis tshua muaj zog.
Hauv kev tsim cov khoom lag luam FRP, kev xaiv cov khoom siv ntxiv yuav tsum xav txog cov txheej txheem molding ntawm cov khoom, vim hais tias hom, txheej txheej thiab cov ntsiab lus ntawm cov khoom siv txhawb zog muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm FRP cov khoom, thiab lawv pib txiav txim siab lub tshuab. lub zog thiab elastic modulus ntawm FRP cov khoom. Kev ua tau zoo ntawm cov khoom pultruded siv cov khoom siv sib txawv kuj txawv.
Tsis tas li ntawd, thaum ua tau raws li qhov yuav tsum tau ua ntawm cov khoom lag luam ntawm cov txheej txheem molding, tus nqi yuav tsum tau txiav txim siab, thiab cov khoom siv hluav taws xob pheej yig yuav tsum tau xaiv ntau li ntau tau. Feem ntau, qhov tsis xaiv rov qab ntawm cov iav fiber ntau yog tus nqi qis dua li cov ntaub fiber ntau; tus nqi ntawmiav fiber matsyog qis dua ntawm daim ntaub, thiab lub impermeability yog zoo. , tab sis lub zog tsawg; alkali fiber ntau yog pheej yig dua li cov alkali-dawb fiber ntau, tab sis nrog nce cov ntsiab lus alkali, nws cov alkali tsis kam, corrosion kuj, thiab cov khoom hluav taws xob yuav txo.
Cov hom ntawm cov khoom siv feem ntau siv reinforcing yog raws li hauv qab no
1. Untwisted iav fiber ntau roving
Siv tus neeg sawv cev txhawb nqa qhov loj me, untwistediav fiber ntau rovtuaj yeem muab faib ua peb hom: plied raw silk, ncaj untwisted roving thiab bulked untwisted roving.
Vim yog qhov tsis sib xws ntawm cov hlua khi, nws yooj yim rau sag, uas ua rau lub voj xoob ntawm cov khoom siv pultrusion kawg, uas cuam tshuam rau kev ua haujlwm zoo ntawm kev ua haujlwm.
Direct untwisted roving muaj cov yam ntxwv ntawm zoo bunching, ceev resin nkag, thiab zoo heev mechanical zog ntawm cov khoom, yog li feem ntau ntawm cov ncaj untwisted rovings yuav siv tam sim no.
Bulked rovings tau txais txiaj ntsig los txhim kho lub zog transverse ntawm cov khoom, xws li crimped rovings thiab air-textured rovings. Bulk roving muaj ob qho tib si lub zog siab ntawm cov fibers ntev ntev thiab qhov loj ntawm cov fibers luv. Nws yog cov khoom siv nrog kev kub siab, tsis tshua muaj thermal conductivity, corrosion kuj, siab muaj peev xwm thiab siab pom efficiency. Qee cov fibers tau ntim rau hauv lub xeev monofilament, yog li nws tuaj yeem txhim kho qhov zoo ntawm cov khoom pultruded. Tam sim no, bulked rovings tau dav siv nyob rau hauv tsev thiab txawv teb chaws, raws li warp thiab weft yarns rau cov hniav los yog industrial woven fabrics. Yuav siv tau los tsim kev sib txhuam, rwb thaiv tsev, kev tiv thaiv los yog sealing cov ntaub ntawv.
Kev ua tau zoo yuav tsum tau rau untwisted iav fiber ntau rovings rau pultrusion:
(1) Tsis muaj qhov tshwm sim overhang;
(2) Lub zog fiber ntau yog sib xws;
(3) Cov khoom zoo;
(4) Zoo hnav tsis kam;
(5) Muaj ob peb lub taub hau tawg, thiab nws tsis yooj yim rau fluff;
(6) Zoo wettability thiab ceev resin impregnation;
(7) Siab zog thiab rigidity.
2. iav fiber ntau lev
Txhawm rau ua kom cov khoom siv FRP pultruded muaj lub zog hloov pauv txaus, cov ntaub ntawv txhawb nqa xws li tws strand lev, nruam strand lev, ua ke lev, thiab cov xov paj tsis sib xws yuav tsum tau siv. Nruam strand lev yog ib qho ntawm feem ntau siv iav fiber ntau transverse reinforcement cov ntaub ntawv tam sim no. Txhawm rau txhim kho cov tsos ntawm cov khoom,nto levyog qee zaum siv.
Lub nruam strand lev yog tsim los ntawm ob peb txheej ntawm cov iav txuas ntxiv uas tau muab tso rau hauv ib lub voj voog, thiab cov fibers raug khi nrog cov nplaum. Qhov saum npoo yog ib daim ntawv nyias zoo li xav tau tsim los ntawm randomly thiab uniformly nteg cov tws strands ntawm ntev ntev thiab sib koom nrog ib tug nplaum. Cov ntsiab lus fiber ntau yog 5% mus rau 15%, thiab thickness yog 0.3 mus rau 0.4 hli. Nws tuaj yeem ua rau saum npoo ntawm cov khoom du thiab zoo nkauj, thiab txhim kho kev laus ntawm cov khoom.
Cov yam ntxwv ntawm iav fiber lev yog: kev tiv thaiv zoo, yooj yim rau saturated nrog resin, siab cov ntsiab lus kua nplaum
Cov kev xav tau ntawm cov txheej txheem pultrusion rau iav fiber ntau lev:
(1) Nws muaj zog txhua yam
(2) Rau chemically bonded chopped strand mats, lub binder yuav tsum tau resistant rau tshuaj thiab thermal teebmeem thaum dipping thiab preforming kom muaj zog txaus thaum lub sij hawm tsim cov txheej txheem;
(3) Zoo wettability;
(4) Tsawg fluff thiab tsawg lub taub hau tawg.
Fiberglass Stitched lev
Cov iav fiber ntau composite lev
3. Polyester fiber ntau nto lev
Polyester fiber ntau saum npoo yog ib yam tshiab ntawm cov khoom siv fiber ntau hauv kev lag luam pultrusion. Muaj ib yam khoom hu ua Nexus hauv Tebchaws Meskas, uas tau siv dav hauv cov khoom siv pultruded los hlooviav fiber nto mats. Nws muaj cov nyhuv zoo thiab tus nqi qis. Nws tau ua tiav siv rau ntau tshaj 10 xyoo.
Qhov zoo ntawm kev siv polyester fiber ntaub so ntswg lev:
(1) Nws tuaj yeem txhim kho qhov cuam tshuam tsis kam, corrosion kuj thiab atmospheric aging kuj ntawm cov khoom;
(2) Nws tuaj yeem txhim kho lub xeev saum npoo ntawm cov khoom thiab ua kom lub ntsej muag ntawm cov khoom smoother;
(3) Daim ntawv thov thiab tensile zog ntawm polyester fiber nto zoo zoo dua li C iav nto xav, thiab nws tsis yooj yim rau tawg thaum lub sij hawm pultrusion txheej txheem, txo qhov chaw nres tsheb;
(4) Lub pultrusion ceev tuaj yeem nce ntxiv;
(5) Nws tuaj yeem txo qhov hnav ntawm pwm thiab txhim kho lub neej kev pab cuam ntawm pwm
4. Cov iav fiber ntau daim kab xev
Hauv qee cov khoom tshwj xeeb pultruded, txhawm rau ua kom tau raws li qee qhov kev xav tau tshwj xeeb, cov ntaub iav nrog qhov dav ruaj khov thiab tuab ntawm tsawg dua 0.2 hli yog siv, thiab nws lub zog tensile thiab transverse lub zog yog qhov zoo heev.
5. Daim ntawv thov ntawm ob-dimensional fabrics thiab peb-dimensional fabrics
Lub transverse mechanical zog ntawm pultruded composite khoom tsis zoo, thiab kev siv ntawm bidirectional braiding zoo txhim kho lub zog thiab nruj ntawm cov khoom pultruded.
Lub warp thiab weft fibers ntawm cov ntaub woven no tsis intertwined nrog ib leeg, tab sis yog intertwined nrog lwm woven cov ntaub, yog li nws yog kiag li txawv los ntawm cov tsoos iav ntaub. Cov fibers nyob rau hauv txhua qhov kev taw qhia yog nyob rau hauv ib tug collimated lub xeev thiab tsis tsim Ib qho dabtsi yog khoov, thiab yog li lub zog thiab nruj ntawm cov khoom pultruded, yog ntau dua li ntawm cov khoom sib xyaw ua los ntawm kev xav tsis tu ncua.
Tam sim no, peb-txoj kev braiding tshuab tau dhau los ua qhov zoo nkauj tshaj plaws thiab nquag siv thev naus laus zis hauv kev lag luam khoom sib xyaw. Raws li cov kev xav tau ntawm cov khoom thauj, cov fiber ntau reinforcing yog ncaj qha mus rau hauv cov qauv nrog cov qauv peb sab, thiab cov duab zoo ib yam li cov khoom sib xyaw uas nws tsim. Peb-txoj kev ntaub yog siv nyob rau hauv cov txheej txheem pultrusion kom kov yeej lub interlaminar shear ntawm tsoos reinforcing fiber pultrusion khoom. Nws muaj qhov tsis zoo ntawm qhov tsis tshua muaj zog shear thiab yooj yim delamination, thiab nws cov interlayer kev ua tau zoo heev.
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Post lub sij hawm: Lub Xya hli ntuj-23-2022
