PSI - Issue 56

Kevin Moj et al. / Procedia Structural Integrity 56 (2024) 120–130 Author name / Structural Integrity Procedia 00 (2019) 000–000

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2.3. Analysis using computed tomography Due to the complex geometry of cellular structures. their accurate representation using additive manufacturing technology poses a challenge. One of the most reliable technologies for identifying defects and dimensional deviations is computed tomography (CT). Currently. CT has become the only non-invasive method for measuring the internal dimensions of geometric features. Because CT reconstruction creates a complete 3D representation of an object based on a large number of 2D X-ray images. it allows for answering questions about the external and internal structure of an element. as well as its material properties (Wu and Yang n.d.; Zadpoor n.d.) . The study of cellular structures was conducted using the Phoenix V Tome xS system (Fig. 3). The system consists of a detector with a resolution of 1000 × 1000 px (pixel size of 200 μ m) and a 16-bit grayscale. a rotary table. and an X-ray lamp with microfocus at a maximum accelerating voltage of 240 kV. The data analysis was performed using GOM Volume Inspect software. With this system. a comprehensive analysis of porosity and dimensional deviations was carried out. simultaneously obtaining a 3D representation of the objects. which was necessary for the issue related to numerical homogenization.

Fig. 3. Examination of cellular structures by computed tomography.

2.4. Determination of the stiffness matrix In order to evaluate the mechanical properties of cellular structures. nTopology software was used to create a representative stiffness matrix for each cell type or several cells using homogenization techniques. This makes it possible to determine the variation of strength properties depending on the number of cells. dimensional deviations and internal defects. The tool provides valuable support for the design of materials with specific mechanical properties. enabling the design of materials with new and unique properties based on structural analysis of cells.