Kev sib txhuam vs Shear
Kev sib txhuam thiab kev ntxhov siab yog ob qhov tshwm sim koom nrog hauv kev ua haujlwm ntawm cov teeb meem. Nws yog ib qho tseem ceeb heev kom muaj kev nkag siab zoo ntawm kev sib txhuam thiab kev ntxhov siab txhawm rau kom tau txais kev nkag siab zoo ntawm thaj chaw xws li hluav taws xob engineering, automobile engineering, mechanical engineering, thiab lwm yam haujlwm. Ob qho kev sib txhuam thiab kev ntxhov siab ua haujlwm tseem ceeb hauv peb lub neej niaj hnub thiab. Yog tias tsis yog rau cov tub rog no, peb yuav tsis tuaj yeem ua feem ntau ntawm cov haujlwm peb ua txhua hnub. Hauv tsab xov xwm no, peb yuav tham txog dab tsi kev sib txhuam thiab kev ntxhov siab yog dab tsi, cov ntsiab lus zoo thiab cov ntsiab lus ntawm kev sib txhuam thiab kev ntxhov siab, lawv cov kev siv thiab cov txheej txheem ntawm kev suav, zoo sib xws thiab thaum kawg lawv qhov sib txawv.
Kev sib tw
Kev sib txhuam yog tej zaum qhov kev tawm tsam ntau tshaj peb tau ntsib txhua hnub. Kev sib txhuam yog tshwm sim los ntawm kev sib cuag ntawm ob qhov chaw ntxhib. Kev sib txhuam muaj tsib hom. Kev sib txhuam qhuav, uas tshwm sim ntawm ob lub cev muaj zog, kev sib txhuam ntawm cov kua dej, uas tseem hu ua viscosity, lubricated kev sib txhuam, qhov twg ob lub khib nyiab sib cais los ntawm cov kua txheej, cov tawv nqaij sib txhuam, uas tawm tsam cov khoom txav hauv cov kua, thiab kev sib txhuam sab hauv, uas ua rau cov khoom sab hauv ntawm cov khoom ua kom muaj kev sib txhuam. Txawm li cas los xij, lo lus "kev sib txhuam" feem ntau yog siv los ntawm kev sib txhuam qhuav. Qhov no yog tshwm sim los ntawm cov kab noj hniav ntxhib microscopic ntawm txhua qhov chaw haum rau ib leeg thiab tsis kam txav mus los. Qhov kev sib txhuam qhuav ntawm ob qhov chaw nyob ntawm qhov sib txhuam coefficient thiab lub zog reactive ib txwm rau lub dav hlau ua rau ntawm cov khoom. Qhov siab tshaj plaws kev sib txhuam zoo li qub ntawm ob qhov chaw tsuas yog siab dua qhov kev sib txhuam dynamic. Nws yuav tsum raug sau tseg tias txawm tias kev sib txhuam yog nyob ntawm qhov qub reactive quab yuam, nws yog ib txwm tangential rau saum npoo, yog li, ib txwm rau lub zog reactive.
Shear Stress
Shear stress yog lub zog deformation. Thaum lub zog yog siv tangential rau ib qho khoom nto, cov khoom zoo li "twist". Rau qhov no tshwm sim, cov khoom yuav tsum tau kho, yog li ntawd, nws tsis tuaj yeem txav mus rau qhov kev taw qhia ntawm lub zog. Chav tsev ntawm kev ntxhov siab yog Newton ib 'meter' squared lossis feem ntau hu ua Pascal. Peb paub tias Pascal kuj yog chav tsev ntawm lub siab. Tab sis, lub ntsiab lus ntawm lub siab yog lub zog ib txwm rau qhov chaw faib los ntawm cheeb tsam, whereas lub ntsiab lus ntawm shear stress yog lub zog sib npaug zos rau saum npoo ntawm ib chav tsev. Torque ua raws li qhov khoom ruaj khov tuaj yeem tsim kev ntxhov siab. Los ntawm kev txhais, tsis yog cov khib nyiab nkaus xwb tab sis cov kua dej tuaj yeem muaj kev ntxhov siab. Cov khoom muaj ib lub cuab yeej hu ua shear modulus, uas qhia peb tias qhov khoom yuav txav deb npaum li cas rau qhov muab kev ntxhov siab. Qhov no nyob ntawm cov duab, qhov loj me, cov khoom siv thiab qhov kub thiab txias ntawm cov khoom. Shear stress of constructions and automobile engineering plays lub luag haujlwm tseem ceeb hauv kev tsim thiab siv cov qauv tsim.
Qhov sib txawv ntawm Friction thiab Shear yog dab tsi?
• Kev sib txhuam tuaj yeem ua rau muaj kev ntxhov siab.
• Kev sib txhuam yog ntsuas hauv Newton, thaum lub zog shear yog ntsuas hauv Pascal.
• Kev sib txhuam yog lub zog, thaum lub zog shear yog ib lub zog ntawm ib cheeb tsam.
• Kev sib txhuam yog nyob ntawm ob qho tib si ntawm qhov chaw sib cuag, thaum lub zog shear tsuas yog nyob ntawm lub zog sib npaug mus rau qhov chaw ntawm ib cheeb tsam.
