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viscoelastique modele

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bonjour,
je viens de commencer à utiliser le Comsol pour ma thèse. Les matieriaux 3D que je souhaite modéliser sont viscoélastiaues (la partie visco est aussi compressible). la relation entre la défor et la contrainte est:
+ de_total/dt=de_elas/dt+de_visc/dt
+ de_els/dt=Seff:(dxicma/dt)--> j'utilise un modèle de structure mécanque élastique isotrope (Eeff, Nueff)
+ de_visc/dt=somme(dXi/dt);
dXi/dt = -1/Tau_i*(Xi-Mu_i*(Sreff:xicma))--> j'utilise n modèles général de forme faible:
+ variable Xi_x; Xi_y; Xi_z; Xi_xy; Xi_yz; Xi_xz; i=1->n
+ condition initial: Xi = 0
+ dweak = -xix_1_test*Mu_1/Tau_1*(A/Eeff*sx_smsld+-B*Nueff/Eeff*sy_smsld+-B*Nueff/Eeff*sz_smsld)....
+ Sreff = tenseur d'ordre 4, fonction 5constants: Eeff, Nueff, A, B, C
est ce qu'il me faut changer les variables de déformation ex_smsld,... := ex_smsld+Xi_x?
ou je dois changer les contraintes = f(sx_smsld, xi)?

merci vos suggestions.

Trung

0 Replies Last Post 15.02.2010, 10:52 GMT-5
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Hello Phan Van Trung

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