xov xwm

Cov khoom siv txhawb nqa yog lub cev pob txha txhawb nqa ntawm cov khoom FRP, uas feem ntau txiav txim siab cov khoom siv kho tshuab ntawm cov khoom pultruded. Kev siv cov khoom siv txhawb nqa kuj muaj qee qhov cuam tshuam rau kev txo qhov shrinkage ntawm cov khoom thiab ua rau muaj kev hloov pauv kub thermal thiab qhov kub qis cuam tshuam lub zog.

Hauv kev tsim cov khoom FRP, kev xaiv cov khoom siv txhawb nqa yuav tsum xav txog tag nrho cov txheej txheem molding ntawm cov khoom, vim tias hom, txoj kev tso thiab cov ntsiab lus ntawm cov khoom siv txhawb nqa muaj kev cuam tshuam loj rau kev ua tau zoo ntawm cov khoom FRP, thiab lawv feem ntau txiav txim siab lub zog kho tshuab thiab elastic modulus ntawm cov khoom FRP. Kev ua tau zoo ntawm cov khoom pultruded siv cov khoom siv txhawb nqa sib txawv kuj txawv.

Tsis tas li ntawd xwb, thaum ua tau raws li cov kev xav tau ntawm cov txheej txheem molding, tus nqi kuj yuav tsum tau xav txog, thiab cov khoom siv pheej yig yuav tsum tau xaiv ntau li ntau tau. Feem ntau, qhov tsis xaiv roving ntawm cov iav fiber strands yog qis dua tus nqi dua li cov ntaub fiber; tus nqi ntawmcov ntaub pua plag iavyog qis dua li ntawm daim ntaub, thiab qhov tsis nkag tau zoo. , tab sis lub zog qis; cov alkali fiber pheej yig dua li cov alkali-free fiber, tab sis nrog rau qhov nce ntawm alkali cov ntsiab lus, nws cov alkali tsis kam, corrosion tsis kam, thiab cov khoom hluav taws xob yuav txo qis.

Cov hom khoom siv reinforcing uas siv ntau yog raws li nram no

1. Cov iav fiber roving tsis sib txuas

Siv cov tshuaj ntxiv dag zog, tsis muaj zogiav fiber rovingmuaj peev xwm muab faib ua peb hom: plied raw silk, direct untwisted roving thiab bulked untwisted roving.

Vim yog qhov tsis sib xws ntawm cov xov plied, nws yooj yim rau sag, uas ua rau lub voj xoob ntawm qhov kawg pub ntawm cov khoom siv pultrusion, uas cuam tshuam rau kev ua haujlwm du.

Kev roving ncaj qha uas tsis sib ntswg muaj cov yam ntxwv ntawm kev sib sau ua ke zoo, kev nkag mus sai ntawm cov resin, thiab cov khoom siv kho tshuab zoo heev, yog li feem ntau ntawm cov kev roving ncaj qha uas tsis sib ntswg feem ntau siv tam sim no.

Cov khoom siv roving uas muaj ntau cov ntaub ntawv zoo pab txhim kho lub zog ntawm cov khoom, xws li cov khoom siv roving uas muaj cov ntaub ntawv crimped thiab cov khoom siv roving uas muaj cov qauv cua. Cov khoom siv roving uas muaj ntau cov ntaub ntawv muaj ob qho tib si lub zog siab ntawm cov xov ntev ntev thiab qhov loj ntawm cov xov luv luv. Nws yog ib yam khoom siv uas tiv taus kub siab, ua kom muaj cua sov tsawg, tiv taus xeb, muaj peev xwm siab thiab ua haujlwm tau zoo. Qee cov xov paj tau muab tso rau hauv lub xeev monofilament, yog li nws kuj tseem tuaj yeem txhim kho qhov zoo ntawm cov khoom pultruded. Tam sim no, cov khoom siv roving uas muaj ntau cov ntaub ntawv tau siv dav hauv tsev thiab txawv teb chaws, ua cov xov paj warp thiab weft rau cov ntaub zoo nkauj lossis cov ntaub lag luam. Siv tau los tsim cov khoom sib txhuam, rwb thaiv tsev, tiv thaiv lossis kaw.

Cov kev cai ua haujlwm rau cov iav fiber rovings untwisted rau pultrusion:

(1) Tsis muaj qhov tshwm sim overhang;

(2) Lub zog ntawm cov fiber yog sib xws;

(3) Kev sib sau ua ke zoo;

(4) Kev hnav tsis kam zoo;

(5) Muaj ob peb lub taub hau tawg, thiab nws tsis yooj yim rau fluff;

(6) Zoo wettability thiab ceev resin impregnation;

(7) Lub zog siab thiab kev nruj.

Fiberglass tsuag roving 

2. Cov iav fiber lev

Yuav kom cov khoom FRP pultruded muaj lub zog txaus transverse, yuav tsum siv cov khoom siv txhawb nqa xws li chopped strand lev, continuous strand lev, combined lev, thiab untwisted yarn fabric. Continuous strand lev yog ib qho ntawm cov khoom siv fiber ntau transverse reinforcement uas siv ntau tshaj plaws tam sim no. Yuav kom txhim kho cov tsos ntawm cov khoom,daim lev saum npooqee zaum siv.

Cov ntaub lev txuas ntxiv yog ua los ntawm ntau txheej ntawm cov iav fiber txuas ntxiv uas tau muab tso rau hauv ib lub voj voog, thiab cov fibers tau sib txuas nrog cov nplaum. Cov ntaub npuag saum npoo yog ib daim ntawv nyias nyias zoo li daim ntawv uas tsim los ntawm kev sib xyaw thiab sib npaug ntawm cov xov txiav uas ntev tas li thiab sib txuas nrog cov nplaum. Cov ntsiab lus fiber yog 5% txog 15%, thiab qhov tuab yog 0.3 txog 0.4 hli. Nws tuaj yeem ua rau qhov chaw ntawm cov khoom du thiab zoo nkauj, thiab txhim kho kev tiv thaiv kev laus ntawm cov khoom.

Cov yam ntxwv ntawm cov iav fiber lev yog: kev npog zoo, yooj yim kom saturated nrog resin, cov kua nplaum siab

Cov kev cai ntawm cov txheej txheem pultrusion rau cov iav fiber lev:

(1) Muaj lub zog kho tshuab siab

(2) Rau cov lev uas raug sib txuas ua ke los ntawm cov tshuaj lom neeg, cov khoom siv khi yuav tsum tiv taus cov tshuaj lom neeg thiab cua sov thaum lub sijhawm dipping thiab preforming kom ntseeg tau tias muaj zog txaus thaum lub sijhawm tsim cov txheej txheem;

(3) Zoo ntub dej;

(4) Tsawg dua fluff thiab tsawg dua tawg taub hau.

Fiberglass Stitched lev

Cov iav fiber sib xyaw lev

3. Cov ntaub pua plag polyester fiber ntau

Cov ntaub polyester fiber nto yog ib hom tshiab ntawm cov khoom siv fiber ntau hauv kev lag luam pultrusion. Muaj ib yam khoom hu ua Nexus hauv Tebchaws Meskas, uas yog siv dav hauv cov khoom pultruded los hloovcov iav fiber ntau nto levNws muaj cov txiaj ntsig zoo thiab tus nqi qis. Nws tau siv tau zoo rau ntau tshaj 10 xyoo.

Qhov zoo ntawm kev siv cov ntaub so ntswg polyester fiber:

(1) Nws tuaj yeem txhim kho qhov cuam tshuam, tiv thaiv corrosion thiab atmospheric laus tiv thaiv ntawm cov khoom;

(2) Nws tuaj yeem txhim kho qhov xwm txheej ntawm cov khoom thiab ua rau qhov chaw ntawm cov khoom du;

(3) Daim ntawv thov thiab cov khoom tensile ntawm polyester fiber nto zoo dua li C iav nto, thiab nws tsis yooj yim rau kev tawg thaum lub sijhawm pultrusion, txo qhov xwm txheej nres tsheb;

(4) Qhov ceev ntawm pultrusion tuaj yeem nce ntxiv;

(5) Nws tuaj yeem txo qhov hnav ntawm cov pwm thiab txhim kho lub neej ua haujlwm ntawm cov pwm

4. Daim kab xev iav fiber

Hauv qee cov khoom siv pultruded tshwj xeeb, txhawm rau kom ua tau raws li qee qhov kev ua tau zoo tshwj xeeb, daim ntaub iav nrog qhov dav ruaj khov thiab tuab tsawg dua 0.2 hli yog siv, thiab nws lub zog tensile thiab lub zog transverse zoo heev.

5. Daim ntawv thov ntawm ob-seem ntaub thiab peb-seem ntaub

Cov khoom siv kho tshuab transverse ntawm cov khoom sib xyaw pultruded tsis zoo, thiab kev siv bidirectional braiding zoo txhim kho lub zog thiab kev tawv ntawm cov khoom pultruded.

Cov xov paj rwb thiab cov xov paj rwb ntawm cov ntaub woven no tsis sib txuas ua ke, tab sis sib txuas nrog lwm cov ntaub woven, yog li nws txawv kiag li ntawm cov ntaub iav ib txwm muaj. Cov xov paj rwb hauv txhua qhov kev taw qhia yog nyob rau hauv lub xeev sib koom ua ke thiab tsis tsim ib qho kev khoov, thiab yog li lub zog thiab kev tawv ntawm cov khoom pultruded, yog siab dua li ntawm cov khoom sib xyaw ua ke ua los ntawm kev xav tas mus li.

Tam sim no, kev siv tshuab braiding peb txoj kev tau dhau los ua qhov chaw tsim kho tshuab zoo nkauj thiab nquag tshaj plaws hauv kev lag luam khoom siv sib xyaw. Raws li qhov yuav tsum tau thauj khoom, cov fiber reinforcing yog woven ncaj qha rau hauv ib qho qauv nrog cov qauv peb-seem, thiab cov duab zoo ib yam li cov khoom sib xyaw uas nws tsim. Cov ntaub peb-txoj kev yog siv rau hauv cov txheej txheem pultrusion kom kov yeej qhov interlaminar shear ntawm cov khoom siv fiber pultrusion ib txwm muaj. Nws muaj qhov tsis zoo ntawm lub zog shear qis thiab yooj yim delamination, thiab nws cov kev ua tau zoo interlayer yog qhov zoo tagnrho.

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