Qhov tseem ceeb tshaj qhov sib txawv ntawm cov yas thiab roj hmab yog cov yas deformation yog yas deformation, thaum roj hmab yog elastic deformation.Hauv lwm lo lus, yas tsis yooj yim rau rov qab mus rau nws lub xeev qub tom qab deformation, thaum roj hmab kuj yooj yim dua.Lub elasticity ntawm cov yas yog me me, feem ntau tsawg dua 100%, thaum cov roj hmab tuaj yeem ncav cuag 1000% lossis ntau dua.Feem ntau ntawm cov txheej txheem yas molding tiav thiab cov txheej txheem khoom tiav, thaum cov txheej txheem roj hmab molding yuav tsum muaj txheej txheem vulcanization.
Yas thiab roj hmab yog ob qho tib si cov ntaub ntawv polymer, uas yog tsim los ntawm carbon thiab hydrogen atoms, thiab qee qhov muaj cov pa oxygen, nitrogen, chlorine, silicon, fluorine, sulfur thiab lwm yam atoms.Lawv muaj cov khoom tshwj xeeb thiab siv tshwj xeeb.Plastics nyob rau hauv chav tsev kub Nws yog ib qho khoom, tawv heev, thiab tsis tuaj yeem ncab thiab deformed.Cov roj hmab tsis siab hardness, elastic, thiab tuaj yeem ncav cuag ntev dua.Nws tuaj yeem rov qab los rau nws qhov qub qub thaum nws nres ncab.Qhov no yog tshwm sim los ntawm lawv cov qauv molecular sib txawv.Lwm qhov txawv yog tias Yas tuaj yeem siv tau thiab rov siv tau ntau zaus, thaum cov roj hmab tsis tuaj yeem siv ncaj qha.Nws tsuas tuaj yeem ua tiav rau hauv cov roj hmab rov qab ua ntej nws tuaj yeem siv tau.Cov duab ntawm cov yas ntawm ntau tshaj 100 degrees txog 200 degrees thiab cov duab ntawm cov roj hmab ntawm 60 txog 100 degrees.Ib yam li ntawd, cov yas tsis suav nrog roj hmab.
Yuav ua li cas paub qhov txawv ntawm cov yas los ntawm yas?
Los ntawm qhov kov ntawm qhov pom, cov roj hmab muaj qhov muag muag, xis nyob thiab muag heev, thiab muaj qee qhov kev sib tw ntawm elasticity, thaum cov yas yog kiag li inelastic thiab muaj qee qhov kev nruj vim tias nws nyuaj thiab nkig.
Los ntawm lub tensile stress-strain nkhaus, yas qhia ib tug siab dua Young's modulus nyob rau hauv thawj theem ntawm nro.Txoj kev nkhaus muaj qhov nce siab, thiab tom qab ntawd yields, elongation thiab tawg tshwm sim;roj hmab feem ntau muaj me me deformation theem.Ib qho kev ntxhov siab pom tseeb nce, thiab tom qab ntawd nkag mus rau theem maj mam nce siab, kom txog rau thaum txoj kev ntxhov siab-txhim kho qhov nkhaus qhia tau hais tias qhov nce siab nce siab thaum nws tab tom tawg.
Los ntawm qhov pom ntawm qhov ntsuas kub, cov yas yog qis dua lub iav hloov pauv ntawm cov khoom siv hauv qhov kub thiab txias, thaum cov roj hmab ua haujlwm nyob rau hauv lub xeev siab elastic siab tshaj nws cov iav hloov pauv kub.
Post lub sij hawm: Dec-31-2021