Evaluation and consideration of local specimen material properties in
lifetime prediction of short fibre reinforced PA6T/6I
Abstract
To exploit the full material potential of short fibre reinforced
PA6T/6I, specific component calculations including aniso- tropic
material behaviour is necessary. For this, different failure criteria
and fatigue models are used to describe the behaviour during a component
service life. This paper deals with the determination and consideration
of fibre orientations for failure criteria and fatigue calculations.
Therefore, a novel method to determine fibre orientation (FO)
distributions across injection moulded plates, is proposed. The
developed method allows a forecast of FOs for different specimen
extraction positions and angles on injection moulded plates by using
only a few measured reference points. As a result, fatigue models can be
calibrated with the strength values and the corresponding FO, calculated
for fracture position. The performed tests show a non-negligible
influence of failure positions, due to fibre orientation distributions
along the specimens. So, the FO determination method delivers an
improvement in strength values estimation.