Numerical material laws for our three FFF materials (PEEK, PPSU, PEEk CF10) have been derived taking into account their intrinsic anisotropic behavior. The identification of the parameters, including those of a failure model model, was performed using the Additive Manufacturing module available in Digimat® (from MSC Software).
In order to assess the mechanical performances of our FFF materials and the reliability of the material laws, a demonstrator was designed and printed with these three materials. Some parts were also machined from stock shapes which allow us to get a reference in terms of mechanical performances (for the unreinforced polymers). All the printed and machined parts were submitted to a quasi-static test until failure, followed by a high-speed camera. The prediction of the mechanical behavior was performed using both an isotropic and full anisotropic approaches, this last one taking explicitly the toolpath and build orientation into account
A topology optimization was performed as well. The new part, lighter by almost 20% has been printed in PEEK and their performances were compared to the original design.
This work was presented at the Digimat Conference (Bordeaux, Fr) and at AMUG (Chicago) in 2019.