Simulation Mechanical and Multiphysics

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Active Member
angel-13
Posts: 7
Registered: ‎03-22-2007

Creep coefficients

143 Views, 1 Replies
03-26-2013 07:38 AM

Good day.Could not be clarified: what coefficients need to ask for the calculation of creep? (Specifically, what values should be a factor of 1 and 3). I use the "power law of Norton."

 

Ecreep = A * sigma^n  * time^m

A = 1.4e-6 (coefficient1)

n = 1.0       (coefficient2)

m = 0.2      (coefficient1)

 

If so set the coefficients, then results do not match.

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Active Member
angel-13
Posts: 7
Registered: ‎03-22-2007

Re: Creep coefficients

03-27-2013 01:10 AM in reply to: angel-13

образец 15х15х60 см
приложенное давление 1 МПа

Ec = 30 000МПа

nu = 0.2


без учета ползучести -- деформация по Z 3.33е-5, cмещение по Z -- 0.02мм

c учетом ползучести  -- результаты некорректны

 

ниже приведен график (теория) зависимостей Eps(t) и Ecreep(t) с подобранными коэффициентами A=1.125e-5, n=1.0, m=0.094 (уточнил), но результаты вычислений у меня с ними не сходятся.

 

sample 15x15x60 cm
applied pressure of 1 MPa
Ec = 30 000MPa
nu = 0.2

without creep - deformation of the Z 3.33e-5, Displacements on Z - 0.02mm (ok)
c considering creep - the results are incorrect

Below is a chart (theory) and the dependence of the Eps(t) and Ecreep(t) with the coefficients A = 1.125e-5, n = 1.0, m = 0.094 (more accurate), but the results of calculations, I do not agree with them.

 

The model: https://www.dropbox.com/s/pmxr7qlna40a0cm/15x15x60.ach

 

Безымянный.jpg

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