Lub hardness thiab elasticity ntawm ib rab riam yog ob qho kev cuam tshuam uas cuam tshuam rau nws cov kev ua tau zoo thiab kev siv tau.
Hardness yog hais txog cov riam phom tsis kam rau deformation, khawb, thiab hnav. Lub riam tawv tawv yog qhov zoo dua tuaj yeem tswj nws cov duab thiab ntug thaum khawb tawm tawv los yog qhuav putty. Nws tuaj yeem txiav los ntawm cov khoom tawv tawv zoo dua, muab cov txheej txheem tshem tawm kom huv. Piv txwv li, ib tug putty riam nrog ib tug kuj hardness yuav yooj yim lis cov laus, hardened txheej ntawm cov xim los yog nplaum yam tsis muaj cov hniav khoov los yog dulling sai sai.
Ntawm qhov tod tes, elasticity yog cov cuab yeej uas tso cai rau cov riam putty flex thiab rov qab mus rau nws qhov qub. Qhov no yog ib qho tseem ceeb heev thaum siv putty tusyees. Ib qho degree ntawm elasticity ua rau cov hniav ua raws li qhov chaw ua haujlwm, kom ntseeg tau tias qhov sib kis ntawm cov putty. Nws pab nyob rau hauv ncav mus rau hauv cov ces kaum thiab nkhaus yam tsis ua rau gouges los yog unevenness.
Qhov kev sib raug zoo ntawm ob qho tib si yog qhov sib npaug. Yog hais tias rab riam yog ib qho nyuaj heev thiab tsis muaj elasticity txaus, nws yuav ua rau tawg los yog tawg thaum muaj kev ntxhov siab, tshwj xeeb tshaj yog thaum lub sij hawm quab yuam ntau dua los yog thaum khoov me ntsis. Piv txwv li, yog hais tias nws yog elastic heev thiab tsis nyuaj txaus, nws yuav tsis muaj peev xwm mus khawb los yog txiav los ntawm cov khoom tougher, thiab cov hniav yuav deform mus tas li thaum siv.
Cov neeg tsim khoom ua tib zoo engineer putty riam kom ua tiav qhov kev pom zoo ua ke ntawm hardness thiab elasticity. Qhov no feem ntau ua tiav los ntawm kev xaiv cov khoom tsim nyog, xws li cov qib tshwj xeeb ntawm cov hlau, thiab los ntawm cov txheej txheem kho cua sov. Qhov kev tshuav nyiaj li cas kom ntseeg tau tias rab riam putty tuaj yeem ua haujlwm ntau yam, los ntawm kev nthuav tawm ib txheej nyias ntawm putty nrog finesse kom tshem tawm cov tuab, qhuav txheej nrog yooj yim, thaum kawg ua rau kev ua haujlwm zoo dua thiab ua haujlwm ntev rau lub cuab yeej.
