3d braided composites yog tsim los ntawm weaving qhuav preformed qhov chaw siv textile technology.Cov qhuav preformed qhov chaw yog siv los txhawb, thiab resin hloov moulding txheej txheem (RTM) los yog resin membrane infiltration txheej txheem (RFI) yog siv los impregnate thiab kho, ncaj qha tsim cov qauv sib xyaw.Raws li cov khoom siv sib xyaw ua ke, nws tau dhau los ua cov khoom siv tseem ceeb hauv kev lag luam aviation thiab aerospace, thiab tau siv dav hauv kev tsheb, nkoj, kev tsim kho, cov khoom ua si thiab cov cuab yeej kho mob.Txoj kev xav ib txwm muaj ntawm kev sib xyaw laminates tsis tuaj yeem ua tau raws li cov khoom siv kho tshuab, yog li cov kws tshawb fawb hauv tsev thiab txawv teb chaws tau tsim txoj kev xav tshiab thiab kev tshuaj xyuas.
Peb-dimensional braided composite yog ib qho ntawm cov khoom siv sib xyaw ua ke, uas yog txhawb nqa los ntawm fiber ntau braided ntaub (tseem hu ua peb-dimensional preformed qhov chaw) woven los ntawm braided technology.Nws muaj lub zog tshwj xeeb, tshwj xeeb modulus, siab ua kom puas siab puas ntsws, tawg toughness, cuam tshuam tsis kam, tawg tsis kam thiab qaug zog thiab lwm yam zoo heev.
Txoj kev loj hlob ntawm peb-DIMENSIONAL braided composites yog vim tsis tshua muaj interlaminar shear lub zog thiab kev cuam tshuam tsis zoo ntawm cov ntaub ntawv sib xyaw ua los ntawm unidirectional lossis bi-directional reinforcement cov ntaub ntawv, uas tsis tuaj yeem siv los ua qhov tseem ceeb ntawm cov kabmob.LR Sanders tau qhia peb-dimensional braided technology rau hauv engineering daim ntawv thov nyob rau hauv 977. Lub thiaj li hu ua 3D braided technology yog peb-dimensional unstitch-dawb tiav qauv uas tau los ntawm kev npaj ntawm ntev thiab luv fibers nyob rau hauv qhov chaw raws li tej kev cai thiab interlacing. nrog rau ib leeg, uas tshem tawm qhov teeb meem ntawm interlayer thiab txhim kho kev puas tsuaj ntawm cov ntaub ntawv sib xyaw.Nws tuaj yeem tsim txhua yam zoo li niaj zaus thiab tshwj xeeb-zoo li lub cev, thiab ua rau cov qauv muaj ntau txoj haujlwm, uas yog, weaving multilayer integral tus tswv cuab.Tam sim no, muaj ntau tshaj 20 txoj kev ntawm peb-dimensional weaving, tab sis muaj plaub feem ntau siv, uas yog polar weaving.
braiding), kab pheeb ces kaum weaving (diagonalbraiding lossis packing
braiding), orthogonal xov weaving (orthogonal braiding), thiab warp interlock braiding.Muaj ntau ntau hom THREE-DIMENSIONAL braiding, xws li ob-kauj ruam peb-dimensional braiding, plaub-kauj ruam peb-dimensional braiding thiab ntau-kauj ruam peb-dimensional braiding.
RTM txheej txheem yam ntxwv
Ib qho tseem ceeb ntawm txoj kev loj hlob ntawm cov txheej txheem RTM yog qhov tseem ceeb molding ntawm cov khoom loj.VARTM, LIGHT-RTM thiab SCRIMP yog cov txheej txheem sawv cev.Kev tshawb fawb thiab kev siv cov txheej txheem RTM koom nrog ntau yam kev qhuab qhia thiab thev naus laus zis, uas yog ib qho ntawm cov kev tshawb fawb nquag tshaj plaws ntawm cov khoom sib xyaw hauv ntiaj teb.Nws cov kev xav tau kev tshawb fawb muaj xws li: kev npaj, tshuaj kinetics thiab rheological zog ntawm resin systems nrog tsawg viscosity thiab kev ua haujlwm siab;Kev npaj thiab permeability yam ntxwv ntawm fiber ntau preform;Khoos phis tawj simulation tshuab ntawm cov txheej txheem molding;On-line saib xyuas tshuab ntawm kev tsim cov txheej txheem;Pwm optimization tsim tshuab;Kev txhim kho cov cuab yeej tshiab nrog tus neeg sawv cev tshwj xeeb hauv vivo;Cov txheej txheem txheeb xyuas tus nqi, thiab lwm yam.
Nrog nws cov txheej txheem kev ua tau zoo, RTM tau siv dav hauv nkoj, tub rog cov chaw, kev tiv thaiv kev lag luam hauv tebchaws, kev thauj mus los, aerospace thiab pej xeem kev lag luam.Nws cov yam ntxwv tseem ceeb yog raws li nram no:
(1) Muaj zog yoog raws hauv pwm tsim thiab xaiv cov khoom siv, raws li qhov sib txawv ntau lawm,
Kev hloov khoom siv kuj hloov tau yooj yim, cov khoom tsim tawm ntawm 1000 ~ 20000 daim / xyoo.
(2) Nws tuaj yeem tsim cov khoom sib txuam nrog qhov zoo ntawm qhov zoo thiab qhov siab qhov tseeb, thiab muaj qhov pom tseeb zoo dua hauv kev tsim cov khoom loj.
(3) Ib qho yooj yim kom paub qhov kev txhawb zog hauv zos thiab cov qauv sandwich;Kev hloov kho ntawm cov khoom siv txhawb nqa cov chav kawm
Hom thiab cov qauv tsim los ua kom tau raws li cov kev xav tau sib txawv ntawm kev lag luam hauv pej xeem mus rau aerospace.
(4) Cov ntsiab lus fiber ntau txog 60%.
(5) RTM molding txheej txheem belongs rau cov txheej txheem pwm kaw, nrog kev ua haujlwm huv si thiab qis styrene emission thaum lub sij hawm molding txheej txheem.
(6) RTM molding txheej txheem muaj cov kev cai nruj ntawm cov khoom siv raw, uas yuav tsum muaj cov khoom siv ntxiv kom muaj kev tiv thaiv zoo rau resin ntws scour thiab infiltration.Nws yuav tsum tau cov resin kom tsis muaj viscosity, siab reactivity, nruab nrab kub curing, qis exothermic ncov tus nqi ntawm curing, me viscosity nyob rau hauv lub leaching txheej txheem, thiab yuav gel sai sai tom qab txhaj tshuaj.
(7) Kev txhaj tshuaj tsis tshua muaj siab, kev txhaj tshuaj dav dav <30psi (1PSI = 68.95Pa), tuaj yeem siv FRP pwm (xws li epoxy pwm, FRP nto electroforming npib tsib xee pwm, thiab lwm yam), qib siab ntawm kev ywj pheej ntawm pwm tsim, pwm tus nqi qis .
(8) Lub porosity ntawm cov khoom yog tsawg.Piv nrog rau cov txheej txheem prepreg molding, RTM txheej txheem yuav tsum tsis muaj kev npaj, kev thauj mus los, kev cia thiab khov ntawm prepreg, tsis muaj txheej txheem txheej txheej txheej thiab lub tshuab nqus tsev nqus, thiab tsis muaj lub sijhawm kho cua sov, yog li kev ua haujlwm yooj yim.
Txawm li cas los xij, RTM txheej txheem tuaj yeem cuam tshuam zoo rau cov khoom ntawm cov khoom kawg vim tias cov resin thiab fiber ntau tuaj yeem ua los ntawm impregnation nyob rau hauv lub molding theem, thiab cov fiber ntau ntws hauv cov kab noj hniav, cov txheej txheem impregnation thiab cov txheej txheem curing ntawm cov resin tuaj yeem cuam tshuam rau cov khoom siv. cov khoom ntawm cov khoom kawg, yog li ua rau cov complexity thiab uncontrollability ntawm cov txheej txheem.
Post lub sij hawm: Dec-31-2021