viscoelasticity

Hi All,

I am a student working on a project involving the effect of residual stresses in elastic and viscoealstic materials. I have a related question: When an easltic body is heated to a certain temperature (say 400 deg C) and then cooled uniformly to room temperature (20 deg C) with a constant cooling rate "q", does this generate any "un-desirable" (residual) stresses within the elastic body? i.e at a steady state - room temperature, does the final stress state within the body would be non-zero? Else, it would eventually reach a state of zero stresses? How?  

The Nanobrücken 2014
Nanomechanical Testing Workshop will take place March 26-28, 2014 at INM -
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The Call for Abstracts (February 9, 2014

Hello All:

I have written a UMAT code to predict the viscoelastic behaviour within a shape adaptive structure. I have followed similar steps used in Abaqus subroutine manual, I have applied this UMAT to a single quad element and it works as predicted. But when I apply it multiple elements model it breaks down. 

Is there any special command i need to put in UMAT subroutine to account multi element analysis? I will appreciate all related comments, 

Thanks

sir,

i amhe currently doing project using ansys. i have to model the properties of a gel using viscoelastic properties. there are different viscoelastic models in ansys , i dont know which model should use and how we get the parameters for that model.hope a favourable reply

regards 

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