Dab tsi yog qhov shear stability ntawm cov roj?

Dab tsi yog qhov shear stability ntawm cov roj?

Ntsuas cov roj zoo Performance index thiab tsis muaj ntau, hnub no peb yuav hais / shear stability, nws yog tus sawv cev ntawm cov roj yam ntawm xwm? Hnub xeev ua tib zoo piav qhia rau koj.

Qhov txiav yog dab tsi? Ua ntej txog [shear stability], peb yuav yog thawj tus los qhia txog lub tswv yim / shear thiab shear yog ib lub sij hawm ntawm architecture. Tsis pub dhau qhov yooj yim ncav cuag qhov tshwj xeeb yog hais txog: nyob rau hauv ib khub ntawm tib qhov loj, taw tes rau lub zog rov qab (piv txwv li, perpendicular mus rau lub luag hauj lwm ntawm lub zog), cov khoom ntawm tus ntoo khaub lig raws cov kev taw qhia ntawm sab nraud quab yuam ntawm tus txheeb ze faulting. thiab deformation tshwm sim.

Thaum xub thawj siab ib muag, tab sis thov kom meej meej: deformation shear quab yuam cov tshuaj tiv thaiv ntawm cov roj nyob rau hauv cov roj, yog hais txog cov roj molecules nyob rau hauv lub kub thiab kub siab, vim hais tias ntawm cov kev nyuaj siab thiab shear kev nyuaj siab ntawm cov roj molecules yog tawg thiab deformation, cuam ​​tshuam cov viscosity ntawm cov roj nws tus kheej.

Shear stability, nyob rau hauv pem hauv ntej ntawm kev nkag siab ntawm ob lub tswv yim, cia peb officially rau shear stability lub ntsiab lus: shear stability yog tus neeg sawv cev ntawm ib tug lubricating roj nyob rau hauv mechanical shear, qhov xwm ntawm lub RCC yuav ruaj khov viscosity.

Zoo shear stability, lubricating roj yuav ruaj khov nyob rau hauv lub tshuab shear viscosity, siv lub voj voog, lub cav roj lubrication nyhuv yog ruaj khov. Shear stability, lubricating roj viscosity txo vim shear. Intuitively, yog cov roj yog thinning.

Cov ntsiab lus: shear stability yog qhov zoo lossis tsis zoo, yuav cuam tshuam rau kev siv cov roj hauv qhov kub thiab txias, nrog rau kev ua haujlwm zoo ntawm lub cav roj.

Yuav ua li cas los txhim kho lub shear stability thiaj li yuav txhim kho cov shear stability ntawm cov roj, cov kws tshawb fawb yuav muab ntxiv rau hauv cov roj viscosity Performance index improver, qhov no yog ib hom kub rhiab heev polymer.

Nyob rau ntawm qhov kub siab dua, nws cov saw hlau molecular stretching, kev sib txhuam ntawm cov roj hauv paus, cov roj ua kua thaiv cov nyhuv, xws li viscosity nce, lubricant viscosity poob rau qee qhov.

Feem ntau, vim yog cov roj formula tsis tu ncua, pub dawb rau faib tag nrho cov roj synthesis muaj ntau qhov zoo hauv shear stability.