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.
