xov xwm

1. Lub zog tensile
Lub zog tensile yog qhov siab tshaj plaws ntawm cov khoom siv tuaj yeem tiv taus ua ntej ncab. Qee cov ntaub ntawv uas tsis yog brittle deform ua ntej rupture, tab sisKevlar® (aramid) fibers, carbon fibers, thiab E-iav fibers yog ib qho yooj yim thiab rupture nrog me ntsis deformation. Tensile zog yog ntsuas raws li quab yuam ib cheeb tsam (Pa lossis Pascals).

2. Qhov ceev thiab lub zog-rau-hnyav piv
Thaum sib piv qhov ntom ntawm peb cov ntaub ntawv, qhov sib txawv tseem ceeb ntawm peb fibers tuaj yeem pom. Yog tias peb cov qauv ntawm tib qhov loj thiab qhov hnyav tau ua, nws sai sai pom tseeb tias Kevlar® fibers yog qhov sib dua, nrog cov pa roj carbon fibers ze thib ob thiabE-iav fibershnyav tshaj plaws.

3. Young's Modulus
Young's modulus yog ib qho kev ntsuas ntawm qhov tawv ntawm cov khoom siv elastic thiab yog ib txoj hauv kev piav qhia cov khoom. Nws yog txhais raws li qhov piv ntawm uniaxial (nyob rau hauv ib qho kev taw qhia) kev nyuaj siab rau uniaxial strain (deformation nyob rau hauv tib txoj kev). Young's modulus = stress/strain, uas txhais tau hais tias cov ntaub ntawv nrog cov Young's modulus yog nruj dua li cov uas tsis tshua muaj Young's modulus.
Qhov nruj ntawm carbon fiber, Kevlar®, thiab iav fiber ntau sib txawv heev. Cov pa roj carbon fiber ntau yog li ob zaug nruj li aramid fibers thiab tsib zaug tawv dua li iav fibers. Lub downside ntawm carbon fiber qhov zoo heev txhav yog tias nws nyhav dua nkig. Thaum nws ua tsis tiav, nws zoo li tsis pom muaj ntau yam mob lossis deformation.

4. Flammability thiab thermal degradation
Ob leeg Kevlar® thiab carbon fiber yog tiv taus rau qhov kub thiab txias, thiab tsis muaj qhov melting point. Ob qho khoom siv tau siv rau hauv cov khaub ncaws tiv thaiv thiab cov ntaub siv hluav taws kub. Fiberglass thaum kawg yuav yaj, tab sis kuj tseem tiv taus qhov kub thiab txias. Tau kawg, frosted iav fibers siv nyob rau hauv vaj tse kuj yuav ua rau kom hluav taws kub.
Cov pa roj carbon fiber ntau thiab Kevlar® yog siv los ua kev tiv thaiv hluav taws los yog vuam pam lossis khaub ncaws. Cov hnab looj tes kevlar feem ntau siv hauv kev lag luam nqaij los tiv thaiv tes thaum siv riam. Txij li thaum cov fibers tsis tshua siv ntawm lawv tus kheej, qhov kub tsis kam ntawm matrix (feem ntau epoxy) kuj tseem ceeb. Thaum rhuab, epoxy resin softens sai heev.

5. Hluav taws xob conductivity
Cov pa roj carbon fiber ua hluav taws xob, tab sis Kevlar® thiabfiberglassdo not.Kevlar® yog siv los rub cov xov hlau hauv cov kav hlau txuas. Txawm hais tias nws tsis ua hluav taws xob, nws nqus dej thiab dej ua hluav taws xob. Yog li ntawd, cov txheej txheem dej tsis zoo yuav tsum tau siv rau Kevlar hauv cov ntawv thov no.

6. UV degradation
Aramid fibersyuav degrade nyob rau hauv tshav ntuj thiab siab UV ib puag ncig. Cov pa roj carbon lossis iav fiber ntau tsis nkag siab rau UV hluav taws xob. Txawm li cas los xij, qee cov matrices xws li epoxy resins tau khaws cia nyob rau hauv tshav ntuj qhov twg nws yuav whiten thiab poob zog. Polyester thiab vinyl ester resins muaj zog dua UV, tab sis tsis muaj zog dua li epoxy resins.

7. Kev qaug zog tsis kam
Yog hais tias ib feem yog pheej rov khoov thiab straightened, nws yuav nws thiaj li poob vim qaug zog.Carbon fiber ntauNws yog me ntsis rhiab heev rau kev qaug zog thiab nyiam ua tsis tau zoo, thaum Kevlar® tiv taus kom qaug zog. Fiberglass yog qhov chaw nyob nruab nrab.

8. Abrasion tsis kam
Kevlar® muaj zog heev rau kev puas tsuaj, uas ua rau nws nyuaj rau kev txiav, thiab ib qho kev siv ntawm Kevlar® yog cov hnab looj tes tiv thaiv rau thaj chaw uas txhais tes yuav raug txiav los ntawm iav los yog siv cov hniav ntse. Carbon thiab iav fibers tsis tshua muaj resistant.

9. Tshuaj tiv thaiv
Aramid fibersrhiab heev rau cov acids muaj zog, cov hauv paus thiab qee cov oxidizing cov neeg ua haujlwm (xws li sodium hypochlorite), uas tuaj yeem ua rau cov fiber ntau degradation. Ordinary chlorine bleach (xws li Clorox®) thiab hydrogen peroxide tsis tuaj yeem siv nrog Kevlar®. Oxygen bleach (xws li sodium perborate) tuaj yeem siv yam tsis muaj kev puas tsuaj aramid fibers.

10. Lub cev sib txuas ua haujlwm
Txhawm rau kom carbon fibers, Kevlar® thiab iav ua tau zoo, lawv yuav tsum tau tuav hauv qhov chaw hauv matrix (feem ntau yog epoxy resin). Yog li ntawd, lub peev xwm ntawm epoxy rau daim ntawv cog lus rau ntau yam fibers yog qhov tseem ceeb.
Ob qho tib si carbon thiabiav fiberstuaj yeem yooj yim lo rau epoxy, tab sis aramid fiber ntau-epoxy daim ntawv cog lus tsis muaj zog raws li qhov xav tau, thiab qhov kev txo qis no tso cai rau dej nkag mus. Raws li qhov tshwm sim, qhov yooj yim uas aramid fibers tuaj yeem nqus dej, ua ke nrog qhov tsis xav tau adhesion rau epoxy, txhais tau hais tias yog qhov chaw ntawm kevlar® sib xyaw puas thiab dej tuaj yeem nkag mus, Kevlar® tuaj yeem nqus dej raws cov fibers thiab tsis muaj zog ntawm cov khoom sib xyaw.

11. Xim thiab xaws
Aramid yog lub teeb kub hauv nws lub xeev ntuj, nws tuaj yeem ua xim thiab tam sim no tuaj hauv ntau qhov ntxoov ntxoo zoo. Fiberglass kuj tuaj hauv cov xim dawb.Carbon fiber ntauyog ib txwm dub thiab tuaj yeem sib xyaw nrog cov xim aramid, tab sis nws tsis tuaj yeem xim nws tus kheej.