Nres ncoo kev sib txhuam coefficient siab dhau los yog qis dhau yuav cuam tshuam rau kev ua haujlwm ntawm braking.
Tshwj xeeb tshaj yog thaum lub tsheb xav tau kev sib txhuam ceev thaum tsav tsheb ntawm kev kub ceev, yog tias qhov sib txhuam coefficient tsawg dhau, lub brakes yuav tsis rhiab, thiab yog tias qhov sib txhuam coefficient siab dhau lawm, cov log tsheb yuav kaw, uas yuav ua rau lub tsheb flick. thiab nplua, uas ua rau muaj kev hem thawj loj rau kev tsav tsheb nyab xeeb. hem.
Raws li lub teb chaws tus qauv, qhov tsim nyog ua hauj lwm kub ntawm nres nres yog {{0}} degree . Txawm li cas los xij, thaum qhov kub ntawm ntau qhov chaw nres tsheb tsis zoo nce mus txog 250 degree, qhov sib txhuam coefficient yuav poob qis, thiab lub nres yuav ua tsis tiav nyob rau lub sijhawm no. Feem ntau hais lus, raws li tus qauv SAE, cov chaw tsim khoom ntawm kev sib txhuam txhuam yuav xaiv FF rating coefficient, uas yog, kev sib txhuam coefficient yog 0.35 ~ 0.45.
Kev sib txhuam los ntawm adhesion yog ib txwm nyob ntawm qhov interface. Nyob rau hauv ciam teb lubrication kev sib txhuam los yog qhuav kev sib txhuam nyob rau hauv ib tug ntub ib puag ncig, cov kua tsim ib tug meniscus los yog adhesion choj nyob ib ncig ntawm lub asperity, thiab cov viscous nyhuv ntawm lub meniscus plays lub luag hauj lwm tseem ceeb thiab nyob rau hauv tej rooj plaub yog tag nrho cov kev sib txhuam quab yuam. Lub adhesion coefficient μa ntawm kev sib txhuam qhuav yog:
μa=Ar•τa/N=τa/Pr= τa/σs
Nyob rau hauv cov mis: Pr - yog qhov tseeb nruab nrab siab, τa, σs - yog cov shear zog txwv thiab tawm los txwv ntawm softer cov ntaub ntawv, feem.
Cov kev tshawb fawb tob tau pom tias thaum kev sib cuag ntawm asperities ntawm qhov chaw yog elastic contact los yog cov yas sib cuag thiab cov nyhuv ntawm cov zaj duab xis nto, nws cuam tshuam rau kev sib koom ua ke ntawm asperity contact, yog li cuam tshuam rau kev sib txhuam tsis kam.
Nws tuaj yeem pom tau tias qhov nce ntawm lub zog shear ntawm cov khoom los yog qhov txo qis ntawm compressive yield txwv yuav ua rau kom muaj kev sib txhuam coefficient ntawm cov khoom. Nyob rau hauv kev tsim qauv ntawm cov ntaub ntawv kev sib txhuam, siab hardness fillers feem ntau yog siv los yog tus nqi siab hardness fillers yog nce los txhim kho cov kev sib txhuam coefficient raws li txoj cai no. High hardness muab tub lim particles yuav ua rau kom lub embedding point thiab embedding qhov tob ntawm kev sib txhuam nto ntawm cov khoom, thiab ua rau kom lub shear quab yuam ntawm cov khoom sib txhuam roughness. Lub zog shear thiab coefficient ntawm kev sib txhuam yog sib txuas ntxiv. Ntawm qhov tod tes, thaum cov khoom siv kev sib txhuam muaj ntau cov khoom muag los tsim cov khoom sib txhuam mos, xws li roj hmab-raws li cov khoom sib txhuam, los yog thaum qhov kub ntawm qhov kev sib txhuam saum npoo nce nyob rau hauv ib qho chaw, compressive yield zog txwv. ntawm cov khoom txo qis, ua rau muaj kev sib txhuam Qhov loj dua qhov chaw sib cuag ntawm qhov chaw, qhov siab dua qhov coefficient ntawm kev sib txhuam.
