Improved Physical Property Prediction of Short Fiber Reinforced
Polyamide
Frank Braymand, L&L Products
Lightweight structural applications using polymers reinforced
with short fibres, processed by injection molding, are well
known in many technical fields.
The main interests to use such materials are the design freedom,
the high mechanical material properties with respect to the
density, the capabilities to produce parts for high volumes.
On one hand, one of the main characteristics of these materials
is a strong anisotropic behaviour. These materials are also
known to be visco-plastic, strain rate dependant and sensitive
to damage. The fibre orientation along the part, the intrinsic
matrix and fibre materials properties are the most influent
factors.
However, in the CAE process, the assumption of a global isotropic
material model is generally used by default. As a consequence,
the application is then over-designed to guarantee a functional
and robust output.
This presentation will show how to implement the fibre orientations
and other material specificities into the CAE process, using
Digimat coupled to Radioss. The study is based on a real and
industrial application. The improvement of predictions, induced
by the coupling of Digimat to Radioss, will be highlighted.
And with an improved predictivity, optimal and robust lightweight
design is then possible.
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