MECHANICAL PROPERTIES EVALUATION OF THE SAMPLES MADE BY SLM, WITH TREE-LIKE FRACTALS INTERNAL STRUCTURE

Anca STANCIU-BIRLESCU, Cristian VILAU, Ioan VOINA, Christian NOESNER, Nicolae BALC

Abstract


Additive manufacturing is in continuous development due to its distinct advantages such as
manufacturing parts with complex geometry, various materials, light weight properties and enabling rapid
prototyping. The purpose of this study is to determine mechanical properties of various test samples
manufactured by Selective Laser Melting (SLM) and modeled using fractal patterns as internal structures.
The design of the samples is modeled following biomimicry concepts using tree-like fractal structures (in different configurations) as internal structures of the part. The tested parts were manufactured using SLM made of tool steel 1.2709 powder. The specimens were tested for compression, bending, and tensile tests. Furthermore, Finite Element Analysis (FEA) was used to describe the deformations and stress distribution in the fractal structures. The experimental results were compared with the FEA results only in linear domain (for elasticity) to determine some properties of the fractal structures. For compression and bending the maximal load can go up to 1600 N, while for traction up to 10000 N. Each fractal configuration has an
influence on the applied load and equivalent stress from the FEA.


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