PSI - Issue 59

Olexandr Ivanov et al. / Procedia Structural Integrity 59 (2024) 330–336 Olexandr Ivanov et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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2.2 Algorithm of modeling the three-dimensional model After conducting of hardfacing material, the invented algorithm was used for modeling of 3D-model of the structure particle. Algorithm includes polishing of material, taking images of the structure and modeling of 3D model based on taken images. The first step consists of polishing and etching the surface of the sample. Researching area was chosen to investigate the structure with a PMT-3 hardness meter. A special clamp mechanism was installed on the hardness meter table for clamping the sample in the same position with every next placement. A standard diamond pyramid indenter under 0.2 kg pressure was used for indenting the material, and an image was taken (Fig. 1, a). After indenting, polishing with a defined number of movements was carried out. An image with the view of the indenting mark was taken after polishing (Fig. 1, b).

Fig. 1. Diamond indenter imprint (highlighted with red rectangular) on the surface of research sample before (a) and after (b) polishing.

The ratio of length to pixels was measured using Image Pro Plus software and was as 10 µm = 30 pixels, which made image processing and modeling easier. Diagonal length before (Fig. 1, a) and after polishing (Fig. 1, b), established namely d 1 = 194.5 pxl and d 2 = 65.5 pxl. Because of the standard parameters of the diamond indenter (Fig. 2), it is possible to establish the parameter which represents the height of material which is removed during polishing.

Fig. 2. Standard geometrical parameters of diamond indenter.

For an imprinting before polishing (Fig. 1, a):