M. Katinić

• University of Slavonski Brod

The aim of this study is to provide a solution for the plastic limit pressure and stress intensity factor of the elbows containing a part-through axial semi-elliptical crack by considering various crack sizes. The supporting system and loading conditions of the pipeline are described. The critical part of the observed pipeline was isolated for anal...

The journal fluid-film bearing is a vital part of a rotary machine, which has a high load-carrying capacity. Babbitt bearings are commonly used to support the shafts of high-speed machines. Severe damage to the babbitt layer can lead to damage of the shaft journal. Fluid-film bearings installed in high-speed machines are exposed to damage due to th...

Citation: Bošnjaković, M.; Stojkov, M.; Katinić, M.; Lacković, I. Effects of Extreme Weather Conditions on PV Systems. Sustainability 2023, 15, 16044.

U radu su primijenjeni i pokazani različiti načini modeliranja oslonca ostvarenog pomoću vijčanog spoja u komercijalnom programu za analizu metodom konačnih elemenata Solidworks. Kao primjer je razmatran sklop oslonca i jednog konstrukcijskog elementa (nosača), spojenih prednapregnutim vijčanim spojem, opterećenih kombinacijom aksijalnog opterećenj...

This article focused on the experimental and statistical analysis of the mechanical properties of dog-bone samples manufactured by fused deposition modelling (FDM). Two identical materials were examined, i.e., Onyx with carbon fiber but from different series and differently stored. One was kept in the manufacturer package and the other one was kept...

In this paper, the dynamic behavior of a rotor kit with two identical disks located between the plain bearings was analyzed. Modal and harmonic analysis of this rotor kit configuration were performed in the Ansys software package. To calibrate the bearing parameters (stiffness and damping) in the numerical model, experimental measurements of the ro...

The use of heat pumps is increasing worldwide, and knowledge of their properties is becoming more and more important. Although numerous tests regarding heat pumps have been performed, due to the large number of influencing variables, the entire range of input parameters is not covered, and there is no overall picture regarding the range of the coef...

Based on the available literature, the status and prospects for further development of the building integrated photovoltaics (BIPV) market were analyzed. The results of the analysis show that the high investment costs and the lack of information about installed BIPV systems and BIPV technology are a problem for the stakeholders. BIPV technology is...

The subject of this paper is the calculation of welding costs of the lower pedestal central ring of the hydraulic excavator. Purpose, applications and the main parts and functions of the hydraulic excavator are described in this paper. The effects of major welding methods on the overall standards of time and the main welding costs of the central ri...

Total structural life analysis methodology, applicable to actual engineering structures, is presented in this paper. It is demonstrated on the case of special purpose hydraulic press, specifically its C-shaped welded frame. The frame is subjected to high loads due to the operation of integrated hydraulic cylinders. In order to withstand such demand...

The rise in prices of traditional energy sources, the high dependence of many countries on their import, and the associated need for security of supply have led to large investments in new capacity of wind power plants. Although wind power generation is a mature technology and levelized cost of electricity low, there is still room for its improveme...

The objective of this work was to investigate the fracture behavior of a heterogeneous I-shaped welded joint in the context of yield load solutions. The weld was divided into two equal parts, using the metal with the higher yield strength and the metal with the lower yield strength compared to base metal. For both configurations of the I-shaped wel...

The C* integral for the compact tension (CT) specimen is calculated using the estimation equation in ASTM E1457-15. This equation was developed based on the assumption of material homogeneity and is not applicable to a welded CT specimen. In this paper, a modified equation for estimating the C* integral for a welded compact tension (CT) specimen un...

Damage to the rotor blade of a steam turbine is a relatively common problem and is one of the leading causes of sudden and unplanned shutdowns of a steam turbine. Therefore, the high reliability of the rotor blades is very important for the safe and economical operation of the steam turbine. To ensure high reliability, it is necessary to perform a...

Many manufacturing processes can induce residual stresses in produced components for high-temperature application. Residual stresses, combined with the primary mechanical stresses, play an important role in structural integrity assessments of high-temperature components. In this paper the elastic and elastic-plastic creep behaviour of mechanically...

This paper describes the failure of a rotor of a condensing industrial steam turbine installed in a fertilizer production plant. There was a fracture of the two adjacent rotor blades in their roots. An analysis of the failure cause was carried out, which included the analysis of the fracture location on the steam flow path, the corrosion deposit an...

The paper analyzes plastic limit loads for cracked tubes containing twin collinear axial through-wall cracks under internal pressure. Calculations of these loads are based on small strain finite element limit analysis using elastic-perfectly plastic materials. Flow stress as the average value of the yield stress and the ultimate tensile strength wa...

Corrosion fatigue has been identified as one of the leading causes of steam turbine rotor blades failure. Despite of numerous research and development in the area of preventing sudden rotor blades failure due to corrosion fatigue, in the practice these failures continue to occur. This paper just describes one of number historical cases of rotor bla...

The paper presents results of impact energy effects on real welded specimens of fine-grained high-strength S960QL steel, and elaborates the dependence of real welded specimen hardness on heat input. Results are obtained through measuring of hardness HV 10 and by experimental Charpy V-notch test. V-notch on test tubes was moved for 0,5 mm from the f...

The steels operating at elevated temperatures are well known to be exposed to premature failure due to cracking caused by constant thermal stress, i. e. secondary creep process. Therefore, creep crack growth tests were carried out on compact tension specimens machined from P91 weld joint at 600°C to determine its behavior in realistic conditions. A...

The effect of initial plasticity on transient creep in plain strain compact tension C(T) specimen under load control is numerically analyzed in this paper. The detailed finite element (FE) analysis was performed by varying the magnitude of the initial step-load, and for general material properties where different plastic and creep stress exponents...

This paper focuses on the identification of failure causes of a bolted joint used for the bedding of a primary column of an aerial platform. The tests conducted to determine chemical composition and mechanical properties have confirmed the 12.9 grade of the bolts. Also, mechanical properties tests and metallographic examination did not indicate any...

Bucket wheel boom represents the most loaded and the most responsible part of the excavator structure, participating only with 6 to 13% in the entire excavator weight. Its length is selected depending on the technological requirements of mining deposit, and it has to be adjusted with the designed possibilities of the excavator. At the request of mi...

The utilization of modern paraboloidal concentrators for conversion of solar radiation into heat energy requires the development and implementation of compact and efficient heat absorbers. Accurate estimation of geometry influence on absorption characteristics of receiver tubes is an important step in this process. This paper deals with absorption...

In this paper, a weld defect in the butt weld according to the EN ISO 6520-1, Series 400, is considered. By inspection of welds it is found that there are several joints with the same weld defect, but only the most critical is analysed. R6 procedure /1/ has been used to find critical depth of crack assuming that the crack is located on the whole bu...

The interaction behavior of twin collinear through-wall cracks in tension loaded plate under elastic-plastic condition is investigated by the finite element method (FEM). The fracture parameter J integral for interacting cracks is calculated and compared to the J integral for a single crack the same size. In this way, the interaction factor of crac...

In many practical situations, high-temperature structures and components contain more than one crack An interaction of such multiple cracks has significant influence on the service life of structures and components. In this paper, the interaction of two identical parallel edge cracks in a finite plate subjected to the remote tension is numerically...