I've this doubt for a long time...
How can I have negative values for volumetric shrinkage. I know that it happends when the material "expands" but in what circumstances?
If this result is obtained by the expression VS = average density/ density(Tamb, P0) the only way the result is negative is if one of the densitys is zero ??? What am I assuming wrong?
Solved! Go to Solution.
The formula for the VS is:
it becomes negative if the density at freeze time (for 2.5D solvers average density over thickness) are higher than the material density at ambient conditions
Thanks a lot for the answer. now it's clear.
In AMI2013 at the help topics the formula is updated and easier to understand than one used at AMI2012.
V.S. = 100 X [ 1 - (average density / reference density) ]
reference state : pressure=0 and temperature= Tambient