Cov txheej txheem:
- Poisson piv rau lub zog ntawm cov ntaub ntawv yog dab tsi?
- Poisson ratio xam li cas?
- Rau cov khoom siv twg Poisson piv ntau dua?
- Poisson piv qhia li cas?
Video: Rau cov khoom poisson tus piv yog qhov piv ntawm?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Poisson tus piv (v) yog qhov tsis tu ncua hais txog cov kev hloov pauv hauv qhov ntev. Nws txhais tau tias yog qhov piv ntawm kev hloov pauv ntawm qhov dav dav ntawm ib chav tsev dav kom hloov pauv hauv axial ntev ntawm ib chav tsev ntev los ntawm axial stretching lossis stressing ntawm cov khoom.
Poisson piv rau lub zog ntawm cov ntaub ntawv yog dab tsi?
Lub zog ntawm cov khoom Poisson tus piv yog txhais tau tias yog qhov tsis zoo ntawm qhov piv ntawm cov kab mob sab nraud rau lub axial strain rau lub xeev kev nyuaj siab uniaxial
Yog tias lub zog tensile yog siv rau ib yam khoom, cov khoom yuav elongate ntawm lub axis ntawm lub load (perpendicular mus rau lub tensile stress plane), raws li qhia nyob rau hauv daim duab 1 (a).
Poisson ratio xam li cas?
Qhov sib npaug ntawm kev suav Poisson tus piv yog muab raws li ν=(-ε_trans)/ε_axial. Transverse strain (ε_trans) yog ntsuas nyob rau hauv cov kev taw qhia perpendicular rau lub zog thov, thiab axial strain (ε_axial) yog ntsuas nyob rau hauv cov kev taw qhia ntawm lub zog thov.
Rau cov khoom siv twg Poisson piv ntau dua?
Tus Poisson tus piv yog ib lub sij hawm tas, nws txhais tau tias Poisson tus piv rau cov khoom nyob nruab nrab ntawm 0 txog 1. Tsis muaj cov khoom uas muaj ntau tshaj 1 thiab tsawg dua 0.
Poisson piv qhia li cas?
Poisson tus piv, muab yooj yim heev, yog qhov ntsuas ntawm qhov dav lossis txoj kab uas hla ntawm cov khoom yuav hloov thaum twg nws rub lengthwiseLos yog, nyob rau hauv ntau cov ntsiab lus, nws yog qhov ntsuas ntawm qhov kev hloov pauv hauv lateral (transverse) strain tshaj qhov kev hloov hauv linear (axial) strain.
Pom zoo:
Nyob rau hauv kev foob kev puas tsuaj muab khoom plig rau qhov tsis zoo yog qhov piv txwv ntawm?
Punitive damages yog kev puas tsuaj txhais tau tias rau txim rau tus neeg raug foob. Lawv tau txais txiaj ntsig tshwj xeeb hauv cov xwm txheej tsis zoo. Piv txwv li, yog tias ib qho khoom tsim tau tsim muaj kev phom sij heev, cov chaw tsim khoom paub tias nws yuav ua rau ib tus neeg muaj caws pliav thiab tsis pom kev, tab sis mus tom ntej thiab muag cov khoom ntawd .
Ntawm qhov sib npaug ntawm qhov sib npaug ntawm cov reactants) thiab cov khoom) yog qhov tas li?
Nyob rau hauv ib qho tshuaj sib npaug, cov tshuaj tiv thaiv rau pem hauv ntej thiab thim rov qab Cov tshuaj tiv thaiv rov qab yog ib qho reaction uas hloov dua siab tshiab ntawm reactants rau cov khoom thiab hloov cov khoom rau reactants tshwm sim ib txhij … Hauv qhov rov qab cov tshuaj tiv thaiv, hydrogen iodide decomposes rov qab rau hauv hydrogen thiab iodine.
Puas yog piv txwv ntawm qhov sib txawv ntawm qhov sib txawv ntawm cov khoom siv hluav taws xob?
Piv txwv rau cov khoom siv tsis ncaj band sib txawv yog silicon (Si), germanium (Ge), aluminium arsenide (AlAs) thiab gallium phosphide (GaP) . Yuav ua li cas piv txwv ntawm indirect band gap? Piv txwv ntawm cov ntaub ntawv ncaj qha muaj xws li amorphous silicon thiab qee cov khoom siv III-V xws li InAs thiab GaAs.
Qhov twg yog qhov piv txwv zoo tshaj plaws ntawm cov khoom siv hluav taws xob dav dav?
Nyiaj yog ib qho piv txwv zoo ntawm cov khoom siv kho mob dav dav. Cov nyiaj ntsuab tuaj yeem hloov pauv rau ntau yam khoom thiab kev pabcuam . Qhov twg yog qhov zoo tshaj plaws piav qhia txog kev siv tshuaj kho mob dav dav? Qhov twg yog qhov zoo tshaj plaws piav qhia txog kev siv tshuaj kho mob dav dav?
Nyob rau hauv qhov kev sib piv tsis raug cov khoom raug muab piv yog?
Ib qho piv txwv tsis tseeb yog ib qho kev poob siab uas ob yam sib piv uas tsis muaj qhov tseem ceeb txaus los muab piv ncaj ncees. Raws li tau hais ua ntej, rau qhov kev xav piv txwv kom siv tau, ob yam uas tau muab piv yuav tsum yog qhov tseem ceeb zoo sib xws hauv txhua txoj hauv kev tseem ceeb .
