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01/11/2007
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Rhodia has integrated multi-scale modelling, mechanical calculation and injection moulding simulation (MMI) and is now offering a CAE service based on this approach for parts moulded in polyamide.
According to the company the MMI approach excels particularly in impact resistance calculations, improves the overall reliability of plastic part simulation and has the potential to reduce the number of prototypes needed.
The calculation package relies on having quality material data, including high-speed properties, and on multi-scale modelling software Digimat-MF, developed by e-Xstream Engineering.
MMI shows its full potential when used in testing the impact resistance of polyamide parts. In the calculation process, the advanced mechanical properties of the polymer matrix stored in the MMI database are combined with the glass fibre orientation defined by injection simulation software.
This map of mechanical properties is then transmitted to mechanical simulation software, such Ansys or LS-Dyna, to evaluate stresses affecting the part.
First studies on parts produced using MMI have shown excellent correlation between impact simulations and actual experimental tests. Normally reverse engineering, using prototypes, would have been needed to correct the model. MMI also responds accurately to changes in mechanical resistance caused by any modification of glass fibre orientation or distribution. Repetition of a complete testing phase is therefore avoided.
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Author
Roger Bishop
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Copyright European Automotive Design.
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