Hi All:
I have a question on the critical energy release rate (Gc) of viscoelastic materials. Viscoelastic materials can have a time dependent critical energy release rate Gc(t). Time dependence of Gc(t) is known/reported only for a few materials - Gc decays over time.
Suppose I have two viscoelastic materials and I know one is more compliant than the other, i.e. in creep (strain vs time) one undergoes higher strain than the other. Can I predict the relative evolution of critical energy release rate of the two, i.e. Gc(t) of which material will decay faster?
Hoping some comments on this issue,
Thanks a lot in advance,
Thomas
Why not model them as time-varying viscoelasticity and plot the respective curves?
Hi Vikash,
Thank you for your answer.
I have the viscoelastic behaviour of the two materials. I am trying to determine their relative critical energy release rate evolution with respect to time. Is there any way to relate the viscoelastic behaviour of the two materials to their relative time-dependent critical energy release rate evolution?
Thank you
Thomas
Have you found the time constants of the two materials? Whether you can relate them or not depends on their characteristics and behaviour. I cannot say unless I have all the information.
Hi Thomas,
the time dependence of the fracture toughness is in first approximation the same of the yield stress. Assuming that the yield stress dependence on time is the same of the modulus (which is not always a correct assumption), you can extimate Gc(t). Check my PhD thesis for more references on viscoelastic fracture theories
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