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Measurement of strain using stereometry
Jasmina Lozanović, Nenad Gubeljak, Aleksander Sedmak, 2009, pregledni znanstveni članek

Opis: This paper presents measurement of strain using stereometry method. It describes the use of digital stereometry to measure microstrains on the surface. This can be achieved by comparison of the images of point distribution on faced surface at different load levels. The examples present the possibility to measure strain concentration in the vicinity of crack tip on metallic sample. Applying two video cameras and corresponding software the image of strain distribution can be obtained in different forms, in 2D and 3D formats.
Ključne besede: stereometric measurement, stress, strains, structural integrity
Objavljeno: 31.05.2012; Ogledov: 731; Prenosov: 24
.pdf Celotno besedilo (454,55 KB)
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Assessment of the load-bearing capacity of a primary pipeline
Nenad Gubeljak, Jelena Vojvodič-Tuma, Borivoj Šuštaršič, Jožef Predan, Maks Oblak, 2007, izvirni znanstveni članek

Opis: High-alloyed Cr-Ni-based two-phase stainless steel (SS) cast alloys are commonly used in nuclear power plants. The mechanical equipment in these facilities can contribute to a reduction in its resistance to stable crack growth as a result of extended operating times and high temperatures. The toughness of these materials strongly depends on their delta (▫$/delta$▫) ferrite content, which spinodally decomposes into two phases with different ratios of Cr and Ni at a relatively low (slightly above 300 °C) temperature. This temperature is similar to the operating temperature of the vital parts, for example, the coolant system. The formation of two phases with the same crystalstructure but different lattice parameters causes internal elastic stresses that result in a hardness increase and an impact-toughness decrease. The result is an increased risk of crack formation in the stress-concentration zones such as the critical regions of different welded joints (e.g. "L, T, K and X" shapes). The values of the critical stress intensity factor change according to its position along the crack contour. Therefore, the aim of our study was to assess the influence of the materials' changes on the crack extension and the decrease of the primary pipeline's bearing capacity by taking account of the increased temperature and time of operation for the given loading conditions. The SINTAP (European Structural Integrity Assessment Procedure) was used for this assessment.
Ključne besede: welding, welded joints, pipelines, fracture toughness testing, structure integrity assessment procedure
Objavljeno: 01.06.2012; Ogledov: 870; Prenosov: 15
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Application of the european SINTAP procedure to the failure analysis of a broken forklift
Nenad Gubeljak, Uwe Zerbst, Jožef Predan, Maks Oblak, 2004, izvirni znanstveni članek

Opis: The recently developed European flaw assessment procedure SINTAP was applied to the failure analysis of a broken fork of a forklift. Based on the service load at failure, critical crack sizes were determined at different analysis levels of the procedure. It was shown in the present case study that the failure was caused by defective design.
Ključne besede: structural integrity, mechanics of structures, forklift, fracture mechanics, critical crack size, failure analysis, SINTAP procedure, load bearing capacity
Objavljeno: 01.06.2012; Ogledov: 987; Prenosov: 25
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An integrity analysis of washing machine holders
Nenad Gubeljak, Jožef Predan, Matej Mejač, 2007, izvirni znanstveni članek

Opis: The paper deals with structure integrity analysis of the holder for the carrying cross of a washing machine drum. Premature fracture of the holder occurred between mechanical sustainable tests of washing machine in the factory. In order to prevent fracture, the task was to determine the reasons for premature fracture of the holder and to estimate the suitability of the new design of the holder cross. Input data for structure integriry analysis were obtained by material by mechanical testing of used materials. Stress and strain analysis of holder limit load was performed by finite element modeling of holder. Dynamic tests of holders with two different thicknesses were done on a servo-hydraulic machine in order to find dynamical strength and endurance of holder. Fracture behaviour of holders is defined as initiation and propagation of crack. The obtained behaviour confirmed that the new design of holders reduces stress concentration in the critical region. Consequently, the new holder subjected to the same dynamic load can endure a higher number of cycles until breakage. The total number of cycles overcomes industrial testing requirements.
Ključne besede: lomna mehanika, visokociklično utrujanje, preizkušanje lomne žilavosti, nosilci kadi pralnega stroja, mejna obremenitev, ocena celovitosti konstrukcije, fracture mechanics, high cycle fatigue, fracture toughness testing, washing machine holders, washing machine drums, structure integrity assessment, limit load
Objavljeno: 10.07.2015; Ogledov: 473; Prenosov: 36
.pdf Celotno besedilo (517,04 KB)
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Attitudes toward workplace mobbing in Slovenian research organisations
Brigita Krsnik Horvat, Milan Pagon, 2012, izvirni znanstveni članek

Opis: Creating a "mobbing-safe" working environment can be a real challenge; to achieve it, a better understanding of related constructs is necessary. To obtain insight into researchers' attitudes toward workplace mobbing and behavioural intentions, we used a case scenario method. The results show that respondents, on average, consider the mobbing cases presented in a questionnaire to be very serious. Their attitudes and behavioural intentions depend more on their opinion about colleagues' attitudes and related intentions and less on their own, which shows a lower integrity than desired. Low willingness to report the violator, lenient discipline sanctions and the absence of proper organisational rules create favourable conditions for workplace mobbing in Slovenian public research organisations. This paper also proposes measures based on the research findings of various authors and identifies new questions that could be addressed in further research.
Ključne besede: workplace mobbing, organisational culture, integrity, public research organisation, researcher
Objavljeno: 28.11.2017; Ogledov: 370; Prenosov: 49
.pdf Celotno besedilo (1014,04 KB)
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Selected legal problems of online advertising
Aleksandra Nowak-Gruca, 2018, izvirni znanstveni članek

Opis: The aim of this article is to analyse the most important issues related to the latest forms of online advertising. In particular, appreciating the importance of online advertising in the development of the information society, the question is then raised about the legal limits of the admissibility of advertising, which is invasive, insistent or contains hidden meaning, inaccessible to the recipient's awareness of content. This issue has been presented from the perspective of European Union (EU) law, in the context of selected directives relevant for online advertising. The problem raised in the article deserves to be developed because we observe a sharp increase in the importance of the Internet, and the online advertising issue has not been the subject of comprehensive regulation in EU law.
Ključne besede: online advertising, native advertising, product placement, unfair competition, integrity in advertising
Objavljeno: 02.08.2018; Ogledov: 97; Prenosov: 25
.pdf Celotno besedilo (327,57 KB)
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