https://scidar.kg.ac.rs/handle/123456789/8210 Tue, 21 Jul 2026 10:13:35 GMT 2026-07-21T10:13:35Z http://https://scidar.kg.ac.rs:80/retrieve/77b26734-780c-46b7-900d-6429b95339d1/c004e3ef-8259-4556-bba6-cb265145c59d.png https://scidar.kg.ac.rs/handle/123456789/8210 https://scidar.kg.ac.rs/handle/123456789/23185 Title: Materials analysis of parts of a subsystem for the tailings’ spreader movement Authors: Arsić, Dušan; Nikolic, Ruzica; Arsić, Aleksandra; Ulewicz, Mazlogata; Gubeljak, Nenad; Cvetković, Dragan Abstract: The spreaders and wheel excavators represent the key elements in the system for the tailings digging and disposal. Here are considered the parts of the caterpillar chain of the subsystem for the spreaderꞌs movement. Those parts are wheels, which were made of the cast steel 42CrMo4+QT, and the shoe links that were made of the cast steel G32NiCrMo8-5-4+QT1. Evaluation of the materialsꞌ properties of those parts included an analysis of the current state of mechanical properties as compared to corresponding properties prescribed by standards. Experimental investigations of materials included determination of their chemical compositions, tensile properties, impact toughness and macro- and micro-hardness' measurements, while the metallographic investigations were conducted, as well. Results of executed experimental investigations of the delivered wheelsꞌ and shoe linksꞌ materials have shown that their damage resistance is at the satisfactory level, i.e., that they would be damaged only in the extreme operating conditions for which they were not designed. It should be emphasized that the lateral movement of the subsystem for the spreader's motion, which can create additional loading on investigated parts, was not taken into account. Thu, 01 Jan 2026 00:00:00 GMT https://scidar.kg.ac.rs/handle/123456789/23185 2026-01-01T00:00:00Z https://scidar.kg.ac.rs/handle/123456789/23184 Title: Critical Total Strain-Based Phase-Field Damage Model for Ductile Fatigue Authors: Dunić, Vladimir; Zivkovic, Miroslav Editors: Schäfer, Michael; Behr, Marek; Bungartz, Hans-Joachim; Schöps, Sebastian; Schulte, Miriam; Torrilhon, Manuel; Weeger, Oliver Abstract: The structural integrity of engineering components is crucial in engineering design, because they are prone to damage due to repeated loading and unloading, particularly under low-cycle fatigue (LCF) conditions. This study presents a critical strain-based phase-field damage model (PFDM) for ductile fatigue. The model captures the accumulation of damage by relating the critical strain energy to fracture energy release rate. The PFDM formulation is integrated into Finite Element Method (FEM) software, enabling the simulation of damage phenomena under cyclic loading. The model considers the evolution of damage driven by energy-based criteria. A numerical example demonstrates the capability of the approach to predict fatigue-induced failure and validates the model’s functionality. This work underscores the importance of energy-based damage indicators for modeling fatigue in ductile materials and a possibility to use critical total strain energy as a material parameter. Thu, 01 Jan 2026 00:00:00 GMT https://scidar.kg.ac.rs/handle/123456789/23184 2026-01-01T00:00:00Z https://scidar.kg.ac.rs/handle/123456789/23158 Title: Application of the SREM method in filler material selection for repair welding Authors: Arsić, Dušan; Komatina, Nikola; Nikolic, Ruzica; Hečko, David Abstract: The selection of filler metal for reparatory welding in this study is addressed through the application of the Square Root Based Evaluation Method (SREM). The aim of the paper was to examine the reliability of the method on a case that has already been solved using a Multi-Criteria Decision-Making (MCDM) approach in the relevant literature. Three filler metals, ABRADUR 58, E DUR 600, and CrWC 600, were considered and ranked based on four important criteria: wear trace width, cost, mass loss, and hardness of welded layers. All the experimental data, required for implementing the SREM method, were taken from a relevant literature source. The results of the study showed that E DUR 600 is the optimal filler metal. In addition, the results obtained using the SREM method are completely identical to those obtained using existing approaches, which confirms the applicability of this method to the considered problem. The sensitivity analysis showed that the ranking of filler metals may differ only in extreme cases, which indicates that the obtained results are sufficiently reliable. Thu, 01 Jan 2026 00:00:00 GMT https://scidar.kg.ac.rs/handle/123456789/23158 2026-01-01T00:00:00Z https://scidar.kg.ac.rs/handle/123456789/23155 Title: Pneumothorax in permature infant: A new perspective trough lung X-ray image segmentation Authors: Prodanovic, Tijana; Zivojinovic, Suzana; Cekovic Djordjevic, Jelena; Simovic, Aleksandra; Petrovic Savic, Suzana; Papovic, Nela; Knezevic, Dragan; Prodanovic, Nikola Abstract: The aim of the research is to analyze methods of visualizing pneumothorax in premature infants through segmentation of lung radiographic images. This study examines the radiograph of a premature infant at 29 weeks gestation diagnosed with pneumothorax. Pneumothorax visualization was performed through segmentation of the lung radiographic image using the MATLAB software environment. Prior to segmentation, the radiographic image was preprocessed, including noise removal and edge enhancement. The expanded portion of lung parenchyma was delineated using active contours, and the algorithm's reliability was assessed through confusion matrix analysis and Dice coefficient. The results demonstrated visualization of the unaffected lung area, with automatic recognition of that region. Performance evaluation parameters showed high accuracy above 0.87. Analysis of segmentation of radiographic images of premature infants with pneumothorax can improve the diagnosis of this urgent condition in neonatology and the evaluation of patients after thoracentesis. Thu, 01 Jan 2026 00:00:00 GMT https://scidar.kg.ac.rs/handle/123456789/23155 2026-01-01T00:00:00Z