Volumetric shrinkage

[alberto.capra]

Hi!

I'm a student of the University of Parma (Italy) and I'm doing an analysis to reproduce a molding process already done on a Negri Bossi.

The material used for these pieces is not listed so I took one similar (PC+ABS) and I edited the data sheet with some values that I know from mine.

In the panel "Shrinkage properties" I filled all the boxes. The medium shrinkage is about 0,5%.

I don't understand why when I do a pack analysis the value of the Volumetric shrinkage at ejection results higher than the maximum value (it results about 4%).

I try to change the packing profile but it has not changed significantly.

Can anyone help me?

Thank you

Alberto

[mayur_dhumal]

Hi Alberto,

Yes, if material is not listed in Moldflow database then you can use a surrogate/alternate material. But when you do this, you should be aware that results will vary as compared to your actual material grade.

I would suggest using a CRIMS available material from the database. If i understood correctly you are saying that value of the Volumetric shrinkage at ejection results is higher than Max shrinkage values from material shrinkage properties, am i right?
In that case you have misunderstood shrinkage & Volumetric shrinkage. they both are different.

Regards,
Mayur