Vol.25, No.1, 2025, pp. 127–133
https://doi.org/10.69644/ivk-2025-01-0127

APPLICATION OF THE DIC METHOD IN DETERMINING FRACTURE MECHANICS PARAMETERS ON RING-SHAPED SPECIMENS WITH A SHARP NOTCH MANUFACTURED USING THE FDM TECHNIQUE

Isaak Trajković1* , Martina Balać2 , Miloš Milošević1 , Bojan Međo3

1) Innovation Center of the Faculty of Mechanical Engineering, Belgrade, SERBIA

I. Trajković https://orcid.org/0000-0001-6671-4733 , *email: trajkovicisaak@gmail.com

M. Milošević https://orcid.org/0000-0002-2418-1032 

2) University of Belgrade, Faculty of Mechanical Engineering, Belgrade, SERBIA

M. Balać https://orcid.org/0000-0002-2135-0179

3) University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, SERBIA

B. Međo  https://orcid.org/0000-0001-8100-7519 

 

Abstract

This paper focuses on the evaluation of fracture mechanics parameters of thin-walled pipeline components using 3D printing and digital image correlation (DIC) techniques. The experimental study is conducted on 3D-printed polymer specimens made of PLA (polylactide acid) using the FDM (Fused Deposition Modelling) process. All specimens were tested on a universal materials testing machine, with strain measurements by the Aramis 2M system based on DIC. This setup allowed for the accurate analysis of key fracture mechanics parameters, including crack mouth opening displacement (CMOD) and crack tip opening displacement (CTOD-5). A new test geometry - the Pipe Ring Notched Tension (PRNT) was compared to standard single-edge notched tension (SENT) specimens and their properties were compared to provide a more realistic assessment of the mechanical behaviour of pipeline materials. This research is particularly important given the increasing use of additive manufacturing to produce functional spare parts, which are increasingly integrated into pressure-containing process equipment, highlighting the importance of accurate fracture mechanics assessment in ensuring component reliability and safety.

Keywords: • fracture mechanics • fused deposition modelling • PRNT - pipe ring notch tension specimens • polylactide acid (PLA) • digital image correlation  

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