Lub tswv yim ntawm "cov khoom siv sib xyaw" yog hais txog qhov xwm txheej uas ib qho khoom siv tsis tuaj yeem ua raws li cov kev xav tau tshwj xeeb; yog li ntawd, ob lossis ntau cov ntaub ntawv raug muab ua ke los tsim cov khoom tshiab uas ua tau raws li cov kev xav tau-li no, cov khoom sib xyaw. Piv txwv li, thaum iav fibers ib leeg muaj lub zog tensile siab, lawv muaj nyob ua ib qho xoob xoob; lawv tuaj yeem tiv taus lub zog tensile tab sis tsis tuaj yeem dais dabtsi yog khoov, shear, lossis compressive stresses, thiab lawv tsis tuaj yeem tsim tau yooj yim rau hauv cov duab geometric ruaj khov, uas tsis tas yuav yog qhov muag muag, pliable loj. Txawm li cas los xij, yog tias cov fibers no tau sib koom ua ke siv cov khoom siv hluavtaws, lawv tuaj yeem tsim rau hauv ntau yam khoom nruj nrog cov duab ruaj khov, muaj peev xwm tiv taus tsis tsuas yog tensile kev nyuaj siab tab sis kuj khoov, compressive, thiab shear stresses. Qhov kev sib xyaw ua ke no suav nrog iav - fiber ntau - cov khoom siv ntxiv cov yas - cov khoom sib xyaw matrix. Vim tias nws lub zog muaj zog piv rau cov hlau-tsis tau nws kuj tseem suav nrog cov khoom iav- nws nthuav tawm cov yam ntxwv ntawm iav, xws li cov luster tshwj xeeb, moldability, corrosion kuj, hluav taws xob rwb thaiv tsev, thiab thermal rwb thaiv tsev. Vim yog cov iav no-zoo li tus cwj pwm, lub npe hu ua "iav-Plastic Reinforced" (los yog *Boligang*) keeb kwm tshwm sim. Lo lus no tau tsim nyob rau xyoo 1958 los ntawm Comrade Lai Jifa, tus qub Minister of the National Ministry of Building Materials Industry, thiab tom qab ntawd tau nthuav tawm los ntawm cov khoom siv hauv tsev los ua ib lub sijhawm lees paub hauv lub tebchaws.
Hais lus nruj me ntsis, lo lus "Glass-Reinforced Plastic" yog hais txog cov yas uas muaj zog ntxiv uas cov iav fibers ua tus neeg sawv cev txhawb zog thiab cov khoom siv hluavtaws ua raws li cov ntawv khi-ib qeb hu ua "Glass Fiber Reinforced Plastics." Nrog rau kev nce qib ntawm kuv lub teb chaws kev lag luam cov ntaub ntawv sib xyaw, ntau yam ntawm cov khoom siv txhawb zog siv hauv cov yas-matrix composites tau nthuav dav dhau cov iav fibers kom suav nrog carbon fibers, boron fibers, aramid fibers, alumina fibers, thiab silicon carbide fibers, thiab lwm yam. Undoubtedly, cov khoom siv txhawb zog uas tsim los siv cov fibers tshiab no yog ib chav kawm ntawm qib siab -kev ua tau zoo fiber ntau- cov khoom siv ntxiv; yog li ntawd, lo lus hais tias "iav-Plastic Reinforced" yog tsis txaus broad los encompass tag nrho cov scope no. Ua tib zoo saib ob qho tib si keeb kwm keeb kwm thiab qhov kev hloov pauv tom ntej ntawm thaj chaw, qhov kev tsim ntau dua "iav- Cov Khoom Siv Siv Hluav Taws Xob" tam sim no feem ntau tau txais.
