alternative to curve-fit (Prony)
I am modeling a visco-elastic behavior. I insert the Shear Data (Shear Modulus-Time) for temperature of 20° and 30°C and I get the Prony Shear Relaxation data after solving the curve fit. But as mentioned on a previous post, I think that curve fitting is not working properly; why do I think so?
- Because the displacement when the Environment Temperature (under Static Structural) is set to 20°C is higher than that of 27°C, meanwhile the shear modulus at input data is decreased when the temperature is increased.
- Prony parameters follow no trend
Is there any alternative way to calculate the visco-elastic behavior without using curve fit?