N. V. Piatkovsky, M. A. Tashkinov

MODELING OF THE MECHANICAL BEHAVIOR OF NONPLANAR MULTI-AXIS FDM-PRINTED PARTS WITH LOCAL MATERIAL ANISOTROPY

The paper presents an approach to finite element modeling of parts manufactured by non-planar multi-axis FDM printing, taking into account the local spatial anisotropy of the material. A software algorithm is developed for the parametric generation of print paths for thin-walled hollow tubes without preliminary slicing. The main contribution of the study lies in the comparative modeling of two layer deposition strategies, namely planar and non-planar, using geometrically oriented local coordinate systems reflecting the expected orientation of orthotropic properties in the walls of a curved tube. The methodology is validated using the example of thin-walled hollow square-section tubes made of ABS plastic. The numerical analysis of the stress-strain state under static three-point bending shows that non-planar deposition, in which non-parallel layers follow the geometry of the part, provides a more uniform stress distribution and reduces local stress concentrations induced by unfavorable layer orientation, but is at the same time more susceptible to delamination.

Acknowledgment: The study was performed at Perm National Research Polytechnic University and supported by the Russian Science Foundation (project No. 22-79-10350-П).

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