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Metals 2018, 8(3), 161; https://doi.org/10.3390/met8030161

Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys

1
Department of Industrial Automation, Ternopil National Ivan Pul’uj Technical University, Rus’ka str. 56, 46001 Ternopil, Ukraine
2
Department of Mobile Machinery and Railway Transport, Faculty of Transport Engineering, Vilnius Gediminas Technical University, Plytinės g. 27, LT-10105 Vilnius, Lithuania
*
Author to whom correspondence should be addressed.
Received: 23 January 2018 / Revised: 18 February 2018 / Accepted: 2 March 2018 / Published: 6 March 2018
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Abstract

An automated method for analyzing the shape and size of dimples of ductile tearing formed during static and impact fracture of titanium alloys VT23 and VT23M is proposed. The method is based on the analysis of the image topology. The method contains the operations of smoothing the initial fractographic image; its convolution with a filter to identify the topological ridges; thresholding with subsequent skeletonization to identify boundaries between dimples; clustering to isolate the connected areas that represent the sought objects—dimples. For each dimple, the following quantitative characteristics were calculated: area, coefficient of roundness and visual depth in units of image intensity. The surface of ductile tearing was studied by analyzing the peculiarities of parameter distribution of the found dimples. The proposed method is applied to fractograms of fracture surfaces of titanium alloys VT23 and VT23M. View Full-Text
Keywords: dimples of tearing; fracture mechanisms; image processing; identification of topological ridges; identification of boundaries between dimples; coefficient of roundness; visual depth dimples of tearing; fracture mechanisms; image processing; identification of topological ridges; identification of boundaries between dimples; coefficient of roundness; visual depth
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Konovalenko, I.; Maruschak, P.; Prentkovskis, O. Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys. Metals 2018, 8, 161.

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