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u1 v1 u2 v2 u3 v3 u4 v4
C1 C3 C4 -C5 C7 -C3 C8 C5 u1
C2 C5 C6 -C3 C9 -C5 C10 v1
C1 -C3 C8 -C5 C7 C3 u2
C2 C5 C10 C3 C9 v2
C1 C3 C4 -C5 u3
C2 C5 C6 v3
C1 -C3 u4
C2 v4
C1= (4d11β+4d33α)K1 α=a/bC2= (4d22α+4d33β)K1 β=b/aC3= (3d12+3d33)K1 K1=t/12 t - debljina pločeC4= (-4d11β+2d33α)K1
C5= (-3d12+3d33)K1 EC6= (2d22α-4d33β)K1 1-ν2
C7= (-2d11β-2d33α)K1 νEC8= (2d11β-4d33α)K1 1-ν2
C9= (-2d22α-2d33β)K1 E EC10= (-4d22α+2d33β)K1 2(1+ν) 2(1+ν)
E - modul elastičnostiν - Poisson-ov keoficijent
K=
Matrica krutosti za četvorougaoni konačni element
d11=d22=
d12=d21=
d33= Za ra
vno s
tanje
napo
na d11=d22=
d12=d21=
d33=
(1-ν)E(1+ν)(1-2ν)
E(1+ν)(1-2ν)
Za ra
vno s
tanje
defor
macij
e