Dab tsi yog ntug dawb ua thaum PPR cov yeeb nkab txiav?
Thaum peb txiav PPR cov kav dej nrog cov yeeb nkab txiav, peb nquag pom cov ntug dawb, ib yam li daim duab hauv qab no. Coob leej neeg hais tias muaj teeb meem nrog cov yeeb nkab dej no, uas yog los ntawm cov khoom siv tsis zoo thiab ntxiv cov hmoov calcium. Qhov ntawd puas yog? Kuv yuav muab txoj kev tshawb fawb nrov rau koj hnub no.
Qhov tseeb, qhov tshwm sim no muaj lub luag haujlwm tshaj lij hauv polymer physics, uas hu ua&"; tshwm sim tsis zoo &".
Crazing tshwm sim yog qhov khoom tshwj xeeb ntawm polymer. Nws txhais tau hais tias nyob rau hauv qhov kev nyuab siab, cov polymer yuav muaj kev ntxhov siab nyob rau qee qhov chaw tsis muaj zog ntawm cov khoom siv thiab tsim cov yas hloov pauv hauv cheeb tsam, yog li nws yog ib qho perpendicular mus rau qhov kev taw qhia ntawm kev nyuaj siab saum npoo lossis hauv cov khoom. Muaj micro-grooves lossis&& quot; tawg&& quot; nrog qhov ntev ntawm 100um, dav txog 10μm, thiab tuab txog 1μm.
Thaum peb txiav PPR cov yeeb nkab dej, thaum cov hniav txiav cov kav dej ntev, lub zog tensile kuj tseem yuav tsim tawm hauv qhov kev hloov pauv. Qhov kev quab yuam no ua rau cov khoom PPR tsim cov nyiaj ntsuab ntawm qhov txiav. Txhawm rau muab nws yooj yim, thaum PPR cov ntaub ntawv raug txiav ntev, muaj lub zog hauv txoj kev hla, uas rub cov khoom, thiab qhov rub tawm no ua rau yas deformation. Yas deformation yog dab tsi? Yas deformation yog txheeb ze rau deformation deformation. Elastic deformation txhais tau tias nws tuaj yeem rov qab los rau nws lub xeev qub tom qab deformation, tab sis yas deformation tsis tuaj yeem rov qab los. Vim tias qhov ntsuas qhov cuam tshuam ntawm qhov tshwm sim tsis zoo sib txawv los ntawm cov khoom PPR ib txwm muaj, lub teeb Nws zoo li nyiaj-dawb luster nyob rau hauv irradiation. Txhawm rau ua tus duab ua piv txwv, iav yog pob tshab, tab sis tawg mus rau hauv cov iav slag yog muaj nyob ntawm cov hmoov dawb, uas yuav nkag siab yooj yim dua.