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Brookeld Engineering Labs., Inc. Page 56 Manual No. M03-165-F0612
Figure V1-13: Custom Screen
V1.3 Math Models
Note: SomeorallofthesemodelsareavailableinWingatherorRheocalc.
Math models provide parameters that indicate how materials will behave in various circumstances
where shear stress and shear rate vary. The data and calculated model parameters can be used
to help QC and R&D characterize how a product will behave for the customer and how it will
behave during processing.
When selecting a math model, it is important to take into consideration the parameters that need
tobemeasured,aswellas,thecondenceoft(CoF).ACoFabove98isrecommended.This
appendix discusses the parameters of the following four models, what kinds of materials they
should be used with, and provides an example of each. All models discussed are available with
Brookeld’sRheocalc™,Wingather™,andRHEO3000™software.
• Power Law (Ostwald)
• Herschel-Bulkley
• Bingham
• Casson
Inadditiontotheabovemodels,thisappendixalsobrieycoverstheNCA/CMACassonmodel
and the IPC Paste Model. These can be found at the end of this section.
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