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Viscoelastic behaviour modelling

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Posts: 124
Topic starter
(@bw_composite)
Estimable Member
Joined: 17 years ago

Hello All,

I have a question on modelling with regards to predicting the long term behaviour of a viscoelastic body.

If a linear viscolelastic material is used, with relaxation time equal to lambda, and the stress at time = k is wanted, how rigourous is it to simply reduce the relaxation time by k, and get the results at time = 1?

Many thanks

Best Regards

Muzialis

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Posts: 4
(@srinivasanb4u)
New Member
Joined: 14 years ago

Sorry, I dont completely understand your question. Do you mean you want to get the accuracy of stress by changing the value of k? If so, then I think maybe there r 2 ways for u to get how rigourous by reducing the relaxation time k:

One is that try in the software. Replace k by several values then simulate respectively at different values of k. Finally, compare to the original data, to check how accurate it is.

The other is employing mathematical calculation, which is based on [sigma(k-dk)-sigma(k)]/sigma(k)

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3 Replies
Posts: 124
Topic starter
(@bw_composite)
Estimable Member
Joined: 17 years ago

Feihuzhao,

thanks for the reply.

Let me explain better my question.

Lets assume my material has a relaxation time of 1000 sec, and I need to compute stresses afetr 10,000 seconds.

What is the mistake committed in reducing, artificially, the relaxation time to 1 sec and calculating the stresses after 10 seconds?

Thanks

Muzialis

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Posts: 4
(@srinivasanb4u)
New Member
Joined: 14 years ago

Sorry for the late reply!

I think this is a mistake for reducing the relaxation time of the one material. Because relaxation time depends on the type of materials and temperature. For the same material at the same temperature, the relaxation time is fixed, can not be changed.

BR
Feihu Zhao

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