In prony shear relaxation model what is Relative moduli?

- April 24, 2021 at 9:07 pm
  
  srep123
  Subscriber
  
  looking at literature i am provided with shear relaxation modulus ratio, is that the same.? if not how can i find the relative moduli, tried searching for it but can't find much about it.nAny help would be greatly appreciated,nthank you.n
- April 27, 2021 at 4:01 am
  
  1shan
  Ansys Employee
  
  Hello Array,
  You need the elastic properties of the material, along with the shear relaxation data (shear modulus vs time). Once you have this data you need to perform a curve fitting process to find out the relative moduli and corresponding relaxation time. This discussion /forum/discussion/2206/alternative-to-curve-fit-prony might help you with the curve fitting process. You may refer 4.7. Viscoelasticity (ansys.com) for the terminology which ANSYS uses. Also, please check the literature that you are referring to for definition of "shear relaxation modulus ratio". I believe it is the ratio of shear relaxation modulus/instantaneous shear modulus (at t=0) and since ANSYS deals with normalized numbers during the fitting process, you could use the same data to get relative moduli.
  Regards,
  Ishan