ISSUE
If you frequently use the fiber solver within Autodesk Simulation Moldflow Insight, you're most likely aware that there are several models that we use. These include the Folgar-Tucker model and the Reduced Strain Closure (RSC) model, among others. These fiber models allow the modification of several orientation model parameters, such as the coefficient of interaction (Ci) or for the RSC model, the appropriate factor to be applied. One of the most common issues here is that when you change this data and then run an analysis with a material that has been tested for CRIMS, the modified data is reset to the default.
This post will cover how to address this issue when working with CRIMS material. You don't want to potentially diminish the accuracy of your results by using the uncorrected shrinkage model, so it is important to know how to control the software to do both.
RESOLUTION
The means of addressing this is to modify a property within the material file that by default has configured the solver to recognize the default fiber parameters when using a CRIMS material. The easiest approach is to simply change the CRIMS model to use something else, such as uncorrected residual stress. That said, in Dual Domain and Midplane CRIMS is vital to accurate warp calculation. To start you'll need to access the Advanced Options so that you can edit the material file.
Once you're in the Advanced Options, you can now modify the material data by choosing the option to Edit Molding Material.
This takes you the typical Details representation of the material. The primary difference being that you can now modify the material input. From here we want to access the Shrinkage tab and access the CRIMS model coefficients.
The last step has us changing the specification for using CRIMS. Specifically the default which is set to Always (change solver parameters to be consistent with CRIMS model). We want this to be specified as the third option (unless you are concerned with the impact your fiber parameter modifications will have on the validity of CRIMS, in which case you can use the second option).
This third option, Always (even if solver parameters are not consistent with CRIMS model), will ensure the use of your fiber parameters even if they don't match the expected fiber parameters for the CRIMS model. Again, this is something that needs to be taken within context. If the fiber changes could influence the CRIMS validation, it's best to use the second option which will then default to use of the uncorrected shrinkage model if the parameters aren't consistent with CRIMS.
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