Abstract
The presented text deals with research into the influence of the printing layers’ orientation on crack propagation in an AlSi10Mg material specimen, produced by additive technology, using the Direct Metal Laser Sintering (DMLS) method. It is a method based on sintering and melting layers of powder material using a laser beam. The material specimen is presented as a Compact Tension test specimen and is printed in four different defined orientations (topology) of the printing layers—0°, 45°, 90°, and twice 90°. The normalized specimen is loaded cyclically, where the crack length is measured and recorded, and at the same time, the crack growth rate is determined. The evaluation of the experiment shows an apparent influence of the topology, which is essential especially for possible use in the design and technical preparation of the production of real machine parts in industrial practice. Simultaneously with the measurement results, other influencing factors are listed, especially product postprocessing and the measurement method used. The hypothesis of crack propagation using Computer Aided Engineering/Finite Element Method (CAE/FEM) simulation is also stated here based on the achieved results.
Highlights
Additive technology, representing a broad portfolio of production methods, is gradually becoming one of the conventional production processes [1]
The uniformity of surface irregularities shows the absence of significant defects that could potentially affect the experiment
The crack propagation in the direction of the printing layers is attenuated due to the diffusion properties of the layers, which form a compact whole by consistent adhesion during melting
Summary
Additive technology, representing a broad portfolio of production methods, is gradually becoming one of the conventional production processes [1]. Technologies of metal 3D printing and Direct Metal Laser Sintering (DMLS) are mainly used [2,3,4]. With their characteristics, additively manufactured metal products approach equivalent materials processed by conventional casting, forming, and subsequent machining from cast and developed semi-finished products [5]. There is a costly and time-consuming production of a tool for casting or forming or for the preparation and debugging of a program controlling the device’s path during machining. Three-dimensional printing technology is suitable due to its productivity, especially for a piece or small series production
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