at lower strain (elastic-plastic region), FEA using ABAQUS shows that the CF (constraint factor) for Ti-6Al-4V, first increases and then decreases with increase in temperature. however, at higher strain (i.e., fully plastic region) the CF increases and then become constant....
but literature which was done experimentally on same material(2006) shows CF decreases at lower strain and becomes constant at higher strain with increase in temperature...
http://www.sciencedirect.com/science/article/pii/S135964620500374X
Hi Mr Dewangan,
As I understand, numerically, this Constraint Factor for low strains increases at first with increasing temperature then decreases, whereas experimentally it should only decrease. Besides, at higher strains, numerical and experimental tendencies are the same (or so it seems).
How big is this increase, and on what temperature range? Apart from this "singularity", how far are the simulation results from the experimental results?
In my opinion, if this increase appears on a narrow temperature range compared to the full temperature range (for example 20°C compared to 500°C), and the rest of your results are in good agreement with the experimental data, there might just be a mistake in the material parameters in this temperature range and you should look at the definition of these parameters in this particular range.
However, if this increase persists on a wide temperature range and all the other results are shifted from the experimental data, the constitutive equation might be wrong or at least the way you defined its parameters... Or it can just be due to meshing, but it's hard to tell without more details.
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