Hi Guy,
I tried to conduct curve fitting by relaxation test data (see Fig.1). But there were something weird, they are:
(i). The cuve fitting by prony series is not smooth (see fig.2). Any something wrong with this?
(ii). Relative moduli (in fig.2) is somewhat different with the one (fig.3). So, which one is the most appropriate value for shear modulus by prony series ?
(iii). What is relative moduli similar with shear modulus?
(iv). As I know in some references, the minimum value for shear modulus is at least 0,2 Mpa. But in fig.2 the moduli is less than 0,2 (0,043). Please explain to me....
Do not rely completely on the Workbench. Sometimes it is possible in EXCEL to make a good approximation.
Hi
In my opinion, Prony series have to be first determined from the experimental results, by using an inverse problem, then identified parameters can be introduced to Ansys software. Make sure that you are really introducing Prony series parameters.
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