Qhov tshwm sim ntawm cov ntug dawb ntawm qhov phais feem ntau tshwm ntawm cov kav dej xim, tab sis nws tsis yooj yim pom hauv cov kav dej PPR dawb. Nws tsis yog vim tsis muaj cov yeeb nkab PPR dawb, tab sis cov yeeb nkab dawb nws tus kheej yog dawb, yog li nws tsis yooj yim. Muaj cov ntug dawb. Yog li, dab tsi yog qhov ua rau ciam teb dawb 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 ua kom muaj zog ntawm lub zog tensile, cov polymer muaj kev nyuab siab nyob hauv qee qhov chaw tsis muaj zog ntawm cov khoom thiab tsim cov yas hauv lub cev hloov pauv, yog li nws yog ib puag ncig mus rau qhov kev taw qhia ntawm kev ntxhov siab ntawm qhov chaw lossis sab hauv ntawm cov khoom. Muaj micro-grooves lossis&& quot; tawg&& quot; nrog qhov ntev ntawm 100 μm, dav txog 10 μm, thiab tuab txog 1 μm. Thaum 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 mus, uas rub cov khoom, thiab qhov rub no ua cov 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 ntawm cov nyiaj sib txawv sib txawv los ntawm cov khoom PPR ib txwm muaj, nws nthuav tawm cov lus dawb-dawb ci hauv qab lub teeb hluav taws xob. 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.
Muaj tus yam ntxwv ntawm ntu uas qhov tshwm sim tshwm sim tshwm sim, uas yog thim rov qab. Nws tuaj yeem ploj los ntawm nws tus kheej saum cov iav hloov pauv kub ntawm cov khoom, uas yog hu ua&"; kho tus kheej &";. Yog li ntawd, rau kev txiav cov kav dej uas tsim cov kab nyiaj, yog tias koj tshuab nrog rab phom cua kub ib ntus, cov nyiaj ntsuab yuav ploj mus ib txhis. Nws yog qhov tshwm sim ntawm lub cev ib txwm muaj qhov dawb ntug ntawm PPR cov kav dej txiav lub qhov ncauj. Yog tias koj txiab tau ntse txaus, lossis koj txiav nrawm nrawm txaus, koj tuaj yeem txo qis qhov kev nyuab siab ntawm sab nraub qaum thaum txiav cov txheej txheem, thiab qhov tshwm sim ua rau me me yuav raug txo qis lossis pom tsis tau.