Property databases do not include both data. In particular, almost never is shore hardness included. Is there an analytical expression or even a rough model to predict shore hardness from viscosities?
Thank you
Hi, in the following article a semi-empirical relationship between the Shore hardness and the rigidity was derived, I think it may also be possible to correlate the viscosity into the equation in a similar fashion. I hope that this will help you:
http://www.sciencedirect.com/science/article/pii/S0142941803001521
cheers...
Sinan, in general there is not an analytical or direct relationship between hardness and viscosity. The hardness number quantifies the resistance to permanent deformation (by measuring the size of the indentation after fully unloading) at some instant in time; it's assumed that the impression does not change with time (permanent). Viscosity is of course rate dependent. Here's an older paper we have discussing that for polymers and indentation hardness:
Tweedie, C.A. and Van Vliet, K.J., “On the indentation recovery and fleeting hardness of polymers,” Journal of Materials Research. 21 3029-3036, 2006. You should be able to access this from ResearchGate.
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