Mechanical design
of injection moulded parts made of short-fibre reinforced thermoplastics by
means of integrative simulation
Ernst Schmachtenberg, Marcel Brandt
Pontstraße
49, 52062
For
a precise mechanical design of injection moulded parts made of short-fibre
reinforced thermoplastics by means of FEA, the local fibre orientation in the
part has to be considered. Therefore an integrative CAE-based simulation concept
is presented that includes the calculation of the fibre orientation in the
actual moulded part, the determination of the anisotropic material properties
of the fibre/matrix-composite and finally a mechanical structural analysis
using these data. In comparison to the results of stiffness calculations
including isotropic substitute properties a marked increase in design quality
is obtained. In the field of strength analysis for anisotropic materials, only
the use of the developed routines based on adequate failure criteria provides
meaningful results. Furthermore, by applying the fracture hypothesis of Puck it
is possible for the first time to differentiate between failure parallel to the
direction of main orientation or perpendicular to it also for short-fibre
reinforced plastics.