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fmpgomes Member Username: fmpgomes
Post Number: 5 Registered: 04-2010
| Posted on Wednesday, July 14, 2010 - 08:21 am: | |
Hi, Sr. Nelson. I'm trying to put a problem about viscoelasticity. About elasticity, in Flex's example, the movement equation are in 'EQUATION' TOPIC, and Hooke's law (constitutive equation)in 'DEFINITIONS'. Now, in viscoelasticity, I have the constitutive equation time-dependen, and I think that this equation must be in 'EQUATION' topic. Or not? In most simple case: s+p1*dt(s)=q0*e+q1*dt(e) , where s is stress and e is strain, p1, q0 and q1 are material constants. For 2D dimensions, s = vector(Sx,Sy,Sxy) and I would have 3 equations, but only 2 variables, U and V, componenents of displacement vector u = vector(U,V). I don't know how put the problem in FlexPDE. Would you have any suggestion? Thnk you for your attention. Flávio |
rgnelson Moderator Username: rgnelson
Post Number: 1384 Registered: 06-2003
| Posted on Thursday, July 15, 2010 - 02:53 pm: | |
We have not specifically tried to do viscoelasticity with FlexPDE, but I see no reason why it cannot be done if the equations are posed in a consistent manner. But since the state of the material (eg stress) is not uniquely determined by displacements U and V, there will have to be more variables represented in the model (perhaps stresses).
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