Rau cov kua dej shear stress τ yog qhov ua haujlwm ntawm tus nqi ntawm dγ / dt. … Daim ntawv ntawm kev sib raug zoo ntawm shear stress thiab tus nqi ntawm strain nyob ntawm ib tug kua, thiab feem ntau cov kua dej ua raws li Newton txoj cai ntawm viscosity, uas hais tias lub shear stress yog proportional rau lub strain rate: τ=µ dγ dt.
Cov kua dej puas txhawb nqa kev ntxhov siab?
Vim fluids tsis tuaj yeem txhawb nqa kev ntxhov siab, nws tsis ua raws li cov kev ntxhov siab no tsis muaj nyob hauv cov kua. Thaum lub sij hawm ntws ntawm cov kua dej tiag tiag, lub shearing stresses suav tias yog lub luag haujlwm tseem ceeb, thiab lawv qhov kev kwv yees yog qhov tseem ceeb ntawm kev ua haujlwm engineering.
Lub zog shearing hauv kua yog dab tsi?
Shear tus nqi yog tus nqi uas cov kua tau sheared lossis "ua haujlwm" thaum ntws. Hauv cov ntsiab lus kev tshaj lij, nws yog tus nqi ntawm cov txheej txheem dej lossis laminae txav dhau ib leeg. Shear tus nqi yog txiav txim los ntawm ob qho tib si geometry thiab ceev ntawm qhov ntws.
Yuav ua li cas rau cov kua thaum siv lub zog shearing?
Shear stress feem ntau yog siv rau cov khib nyiab. Shear quab yuam ua tangentially rau saum npoo ntawm lub cev khoom ua rau deformation. Hauv qhov sib piv rau cov khib nyiab uas tuaj yeem tiv taus deformation, cov kua tsis muaj peev xwm, thiab ntws raws li qhov kev txiav txim ntawm lub zog.
Yuav ua li cas yog lub mis rau kev ntxhov siab?
The formula for shear stress is tau=F / A, qhov twg 'F' yog lub zog siv rau tus tswv cuab, thiab 'A' yog qhov chaw hla ntawm qhov member.
