Ib yam tshiab ntawm Kevlar lub hom phiaj los nres cov mos txwv nrog cov khoom siv tsawg

Tab sis hom tshiab ntawm Kevlar yog nyob rau lub qab ntug uas lub hom phiaj ua kom zoo li ballistic-resistant li qub thaum ua nyias thiab sib dua. Nws yuav tsis raug kho rau hauv John Wick-style suits koj pom hauv Hollywood cov yeeb yaj kiab, tab sis DuPont, lub tuam txhab ua nws, hais tias nws yog li 30 feem pua ​​sib dua. Yog tias Kevlar tsis tu ncua hnyav txog ib phaus ib square feet, cov khoom tshiab hnyav txog 0.65 lossis 0.7 phaus ib square feet.

Steven LaGanke, tus thawj coj thoob ntiaj teb ntawm DuPont hais tias "Peb tau tsim cov tshuab fiber ntau tshiab,"

Nov yog yam uas yuav tsum paub txog cov khoom siv phom phom feem ntau ua haujlwm li cas, thiab dab tsi ua rau cov khoom tshiab txawv.

Cov mos txwv txheej yuav tsum ua ob yam: Nco ntsoov tias lub mos txwv tsis tuaj yeem nkag mus rau nws, thiab nqus nws lub zog-thiab hloov lub zog ntawd rau hauv cov mos txwv nws tus kheej, qhov zoo tshaj plaws deforming thaum nws tsoo. Yog tias ib txheej ntawm cov ntaub nres ib lub mos txwv tab sis tom qab ntawd dhau los ua lub vev xaib xoob tom qab raug ntaus los ntawm ntaus pob, qhov ntawd tsis zoo, piav qhia Joseph Hovanec, lub tuam txhab tus thawj tswj hwm thoob ntiaj teb. "Koj kuj tsis xav kom lub vas txuas mus ntxiv, vim tias tam sim no cov mos txwv tau tawm mus rau hauv koj."

Tus yuam sij yog lub zog ntawm cov fibers, thiab qhov tseeb tias "lawv tsis ncab deb heev," Hovanec tau hais. "Nws yog qhov rub ntawm cov fibers uas ua rau cov mos txwv-vim tias nws muaj zog heev, [lossis] lub zog kinetic-rau deform. Yog li koj yeej ntes nws, thiab lub zog nkag mus rau hauv deforming lub mos txwv, tsis tawg cov fibers. " Cov mos txwv yuav tsum "ntev nrawm heev," nws hais. Ntawm no yog ib tug yees duab ntawm lub simulation.

Kevlar, cov khoom siv hluavtaws hu ua para-aramid, tsis yog tib lub para-aramid hauv nroog: Lwm qhov para-aramid siv hauv lub cev armor hu ua Twaron, thiab qee lub cev armor kuj yog tsim los ntawm polyethylene (ib hom yas).

Kevlar tshiab kuj yog ib qho aramid fiber ntau, tab sis nws txawv me ntsis ntawm qhov qub. Kevlar tsis tu ncua yog ua los ntawm ob lub monomers (ib hom molecule), thaum Kevlar tshiab muaj ib qho ntxiv, rau tag nrho peb. "Qhov thib peb monomer tso cai rau peb kom tau txais ib qho kev npaj ntxiv ntawm cov molecules nyob rau hauv lub kawg fiber, uas ua rau peb muaj zog ntau dua li ib txwm aramid, Kevlar los yog polyethylene," Hovanec hais.

Cov tsho tiv thaiv mos txwv feem ntau yuav tsum tau ua kom tau raws li cov qauv tshwj xeeb los ntawm National Institute of Justice. Lub hom phiaj nrog Kevlar tshiab yog tias, vim nws lub zog siab dua, nws tuaj yeem ua tau raws li cov qauv qub thaum siv cov khoom me me hauv lub tsho khuam. Piv txwv li, Kevlar ib txwm muaj li ntawm 0.26 lossis 0.27 ntiv tes tuab, thaum cov khoom tshiab tuaj yeem nyias li 0.19 ntiv tes, Hovanec tau hais. "Qhov ntawd yog qhov txo qis hauv cov khoom thickness."

Lub ballistic txheej ua los ntawm cov ntaub ntawv xws li Kevlar lossis Twaron tsuas yog ib feem ntawm lub cev armor. Hovanec tau hais tias "Cov txheej txheem ballistic ua txoj haujlwm, tab sis nws yog nyob rau hauv lub kaw lus kaw los tiv thaiv nws, thiab tom qab ntawd muaj cov ntaub uas hla lub ballistic txheej," Hovanec tau hais. "Thaum koj pom cov khoom tiav lawm, muaj ntau yam khoom ntxiv rau saum."