Iskanje po katalogu digitalne knjižnice

Opis: This dataset was prepared in the context of the HybridNeuro project (https://www.hybridneuro.feri.um.si/). It contains a collection of teaching materials and data that were used in the Hands-on Training on motor unit identification in dynamic and fatiguing muscle contractions, which was part of the Workshop on Invasive Interfaces (WSII25) in Gothenburg, Sweden, in January 2025. The Hands-on Training covered the practical aspects of motor unit identification in various types of muscle contractions. The teaching materials include a curated set of HDEMG signals, with simulated motor unit discharge patterns and Motor Unit Action Potentials (MUAPs) recorded from healthy volunteers in dynamic (biceps brachii) and fatiguing (abductor pollicis brevis) contractions. The HDEMG signals were decomposed using the DEMUSE software [1] (https://demuse.feri.um.si/). A dedicated MATLAB software was implemented for the accuracy assessment and visual comparison of automatic or manually edited HDEMG decomposition results and is included in the dataset. Total dataset size is 1 GB.
Ključne besede: HybridNeuro, hands-on-training, teaching materials, surface high density electromyogram (HDEMG), motor unit, EMG decomposition, DEMUSE Tool, dynamic contractions, fatigue, simulated HDEMG, evaluation, dataset, Matlab
Objavljeno v DKUM: 21.01.2026; Ogledov: 0; Prenosov: 3
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Opis: A review of the fatigue behavior of triply periodic minimal surface (TPMS) metamaterials with consideration for their fabrication is presented in this paper. The review analyses the most common TPMS geometries used due to their mechanical characteristics. Production methods and the base materials used are presented with the key advantages and drawbacks. Furthermore, the mechanical characteristics of cellular structures with emphasis on TPMS geometries are described. Lastly, the state-of-the-art findings of their fatigue behavior are analyzed and explained. Based on the findings in this article, cellular geometries based on TPMS are superior to conventional cellular structures when comparing their fatigue life. Because of the smooth transitions between struts or surfaces, the stress distribution is much more uniform without stress concentration zones.
Ključne besede: cellular structures, TPMS metamaterials, production technologies, mechanical characterization, fatigue behavior
Objavljeno v DKUM: 09.12.2025; Ogledov: 0; Prenosov: 5
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Opis: This study presents the computational analysis for determining the fatigue life of different chiral auxetic structures made of aluminium alloys 5083-H111. The influence of Poisson's ratio on the loading process was investigated to determine which structures exhibited the auxetic effect and how intense it was. Finally, the fatigue life calculation was performed using the strain life approach in the framework of the ANSYS software. The fatigue life determination was evaluated using the approach of amplitude strains, amplitude forces, and strain energy density per cycle. The computational results were described and presented according to predefined approaches, from which it was determined which chiral structure can withstand the highest number of loading cycles at the prescribed load, and which structure shows the most favourable combination of mechanical and physical properties.
Ključne besede: advanced metamaterials, chiral auxetic structures, fatigue behaviour, numerical simulations, aluminium alloys
Objavljeno v DKUM: 20.05.2025; Ogledov: 0; Prenosov: 15
Celotno besedilo (4,31 MB)
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Opis: This paper presents an experimental and numerical analysis of the mechanical behaviour of orthopaedic implants with crack-type defects, considering the principles and advantages of the modern X-FEM method, which was used due to limitations of traditional FEM in terms of crack growth simulation, especially for complex geometries. In X-FEM, the finite element space is enriched with discontinuity functions and asymptotic functions at the crack tip, which are integrated into the standard finite element approximation using the unity division property. Though rare, femoral component failures are well-documented complications that can occur after hip prosthetic implantation. Most stem fractures happen in the first third of the implant due to the loosening of the proximal stem and fixation of the distal stem, leading to bending and eventual fatigue failure. The main goal of this paper was to obtain accurate and representative models of such failures. Experimental analyses of the mechanical behaviour of implants subjected to physiological loads, according to relevant standards, using a new combined approach, including both experiments and numerical simulations was presented. The goal was to verify the numerical results and obtain a novel, effective methodology for assessing the remaining fatigue life of hip implants. For this purpose, the analysis of the influence of Paris coefficients on the total number of cycles was also considered. Hence, this simulation involved defining loads to closely mimic real-life scenarios, including a combination of activities such as ascending stairs, stumbling, and descending stairs. The tensile properties of the titanium alloy were experimentally determined, along with the Paris law coefficients C and m. The finite element software ANSYS 2022R2 version was used to develop and calculate the three-dimensional model with a crack, and the resulting stresses, stress intensity factors, and the number of cycles presented in the figures, tables, and diagrams. The results for the fatigue life of a partial hip implant subjected to various load cases indicated significant differences in behaviour, and this underscores the importance of analysing each case individually, as these loads are heavily influenced by each patient’s specific activities. It was concluded that the use of numerical methods enabled the preliminary analyses of the mechanical behaviour of implants under fatigue loading for several different load cases, and these findings can be effectively used to predict the possibility of Ti-6Al-4V implant failure under variable cyclic loads.
Ključne besede: structural integrity, fatigue fracture, extended finite element method (XFEM), experimental testing, DIC, numerical simulations, stress intensity factor, orthopaedic implants, crack-type defect
Objavljeno v DKUM: 21.03.2025; Ogledov: 0; Prenosov: 10
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Opis: In the paper the factors of workers fatigue were tested by applying network thinking methodology supported by statistical analysis to determine the nature of individual factors for the fatigue management system development. Analysis of the distribution of factors along the intensity map allowed their classification into individual interaction categories, describing directions for miner fatigue management. Active factors were discovered which are: Elevated temperature, Noise and vibration, Oxygen-poor air and mining gases, High humidity, Poor work organization. Critical factors for fatigue management were: Poor technical condition of equipment and Long and time-consuming approach to headings.
Ključne besede: fatigue factors, fatigue management, mine, miners, network thinking, safety
Objavljeno v DKUM: 15.01.2025; Ogledov: 0; Prenosov: 11
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