OnpartdeSigma:équationd'équilibre + équation de compatiblité
( div Sigma = Vecteur nulle) soit sigma ij,j = 0
Eq de Beltrami Delta Sigma + 1/1+vgradgradtrsigma =0 soit
sigma ij,kk + 1/1+v sigma kk, ij =0
2)Loi de Hooke -> Epsilon = (1+ v) /E *sigma - v/E tr II
3)integre -> Sigma
Eij = 1/2 (Ui,j + Uj,i ) soit 2Eij = ui,j + Uj,i
& Eii = Ui,i
Stratégie : je travaille sur les éléments diagonaux puis je reporte sur les 3 termes extradiagonaux
Si Eii = Ui,i soit U1(x1,x2,x3)= E11 x1 + f(x2,x3)
Ainsi de suite
Après 2Eij=f1,2 + f2,1 soit f1,2(x2,x3)= -f2.1(x1,x3) = K12(x3)
de même pour les deux autres K
Enfin on dérive fij et fji selon k = K'(k)=C1deMêmepourlesautresEnfinonserendcomptedesConstantes (souventnul)
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