3D mesh Warpage of Fiber Filled

[adevadkar]

Hello Moldflow Users,

I am using PEEK family material with 40% Carbon Fiber Filled.
Their mechanical  properties are as below.

using automatic shrinkage compensation  I am getting around 1% shrinkage 
but as per material data sheet its 0.1% 

I wanted to understand how mechanical properties were used in calculation of warpage. Does any one have idea bout what generic equation is used in solver for calculating warpage. how material properties are being corelate to warpage.

@bernor_mf ,@PascalGosset , @mason.myers
Can you guide me on this topic.

Thanks & Regards,
Anirudha D

[mason.myers · Accepted solution]

Hello @adevadkar ,

For a 3D mesh, we will use these mechanical properties for warpage calculations.  Because that text is in red, this indicates that the mechanical data is a supplemental average within that material family.  You might see more accurate results with a material with tested mechanical properties for that specific material.

Here is some information on the shrinkage models and the 3D uncorrected stress:

Shrinkage Models

3D Uncorrected Residual Stress

If you are using 2024 or 2025 and if your material has CRIMS data, you could try the new STAMP model in 3D.

Mason

[bernor_mf · Accepted solution]

@adevadkar 

Hi,
I just wanted to add about using Estimated shrinkage.

You mention using automatic shrinkage compensation, which I understand as using deflection properties
using Estimated shrinkage, Option Automatic.

Now, this is just Estimated shrinkage. Should be used with care.
A deflection of part shape could affect the outcome.
If outer edges bends more in an axis direction the estimated shrinkage could become higher in that direction.

Do some examine of points at relevant positions. (Could change drop-down to Coordinate + Shrinkage in Deflection Query dialog.)

I think this actually helps to understand this a bit more, even if sounds a bit off topic.
Deflection results showing 0% shrinkage compensation when set to automatic in Moldflow

Hope this helps.

Regards,

Berndt

[havenmadison54]

I’m curious to know how mechanical properties factor into the warpage calculation during the simulation. Does anyone know what generic equations are typically used in solvers for calculating page? How are the material properties correlated with warpage during the process?

[mason.myers]

Hello @havenmadison54 ,

We use different warpage solvers between Midplane/Dual Domain and 3D.  3D would use mechanical properties while MP/DD would use shrinkage or CRIMS data (if available).

Here is some information on the shrinkage models and the 3D uncorrected stress:

Shrinkage Models

3D Uncorrected Residual Stress

If you are using 2024 or 2025 and if your material has CRIMS data, you could try the new STAMP model in 3D.

Mason

[h-fujitaDXJU5]

Hi

Residual stress drives warpage, stiffness(elastic modulus, structure) prevent warpage. You can study from Moldflow help files. 

Here is an academic information in this forum.

https://forums.autodesk.com/t5/moldflow-insight-forum/cte-in-warpage-analysis/m-p/8826560/highlight/...

[usama526125]

Interesting discussion on fiber-filled material warpage and how simulation accuracy can vary depending on mesh strategy and material orientation. It really highlights how small adjustments in modeling parameters can have a major impact on final product quality.