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Hydrogen production, storage and transport for renewable energy and chemicals : An environmental footprint assessment
Robert Hren, Annamaria Vujanović, Yee Van Fan, Damjan Krajnc, Jiri Klemeš, Lidija Čuček, 2023, original scientific article

Keywords: hydrogen producing technologies, hydrogen storage, hydrogen transport, life cycle assessment, different electricity sources, energy and environmental footprints, eco-benefit and eco-cost, comparative impact assessment
Published in DKUM: 10.05.2024; Views: 240; Downloads: 82
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Weldability investigation steel P 91 by weld thermal cycle simulation
Marko Dunđer, Ivan Samardžić, Tomaž Vuherer, 2015, original scientific article

Abstract: This paper elaborates results of hardness and impact energy of thermal cycle simulated specimens of high-alloy steel P 91 and their dependence on cooling time from 800 to 500 °C. Results were obtained by measuring hardness HV 1 and by experimental testing of Charpy notched specimens. Metallographic analysis of samples was performed on scanning electronic microscope.
Keywords: welding, P 91, hardness, impact energy, cooling
Published in DKUM: 03.07.2017; Views: 2420; Downloads: 120
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Impact energy analysis of quenched and tempered fine grain structural steel specimens after weld thermal cycle simulation
Marko Dunđer, Tomaž Vuherer, Ivan Samardžić, 2014, original scientific article

Abstract: The paper presents impact energy results of thermal cycle simulated specimens of quenched and tempered fine grain structural steel S960QL. These results are obtained by examining notched Charpy specimens. Upon performed metallographic analysis and measured hardness, total impact energy is separated into ductile and brittle components.
Keywords: quenched and tempered fine grain structural steel, welding thermal cycle, impact energy, cooling time t8/5
Published in DKUM: 03.07.2017; Views: 1266; Downloads: 142
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Dependence of hardness and impact energy on cooling time Δt8/5 and temperature for S960QL
Ivan Samardžić, Marko Dunđer, Tomaž Vuherer, 2014, original scientific article

Abstract: The paper deals with research into dependence of hardness and impact energy of thermal cycle simulated specimens of fine-grained structural steel S960QL on cooling time from 800 to 500 °C and on tested temperature. Results were obtained by measuring hardness of HV 10 and by experimental testing of Charpy notched tubes on instrumented Charpy hammer. Total impact energy, initiation energy and fracture propagation energy needed for occurrence of fracture is also elaborated.
Keywords: structural steel, quenched hardness, impact energy, cooling time
Published in DKUM: 03.07.2017; Views: 1150; Downloads: 113
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Analysis of FRP side-door impact beam
Simon Eržen, Zoran Ren, Ivan Anžel, 2002, published scientific conference contribution

Abstract: The paper addresses the applicability importance of Fiber Reinforced Plastics (FRP) in automotive industry. Increased usage of FRP directly influences the car weight reduction and, consequently, gas emissions. An example is presentedfor the solution of reducing the total weight of a passenger car using a local design solution, which comprises a redesign of a side-door impact beam made of Twintex. The Finite Element Method (FEM) was used for computational analyses of behaviour of side-door impact beam under loading with aim to determine its capacity of impact energy absorption in relation to a standard steel impact beam. Different stacking sequences of composite beam were analysed with intention to find the most suitable solution in terms of strength, stiffness, absorbed energy and weight reduction. Computational analyses have shown that appropriately stacked Twintex impact beam has adequate load-carrying capacities and that it absorbs more strain energy as its steel equivalent. By following the criteria for maintaining the same stiffness, it is shown that employment of the Twintex composite leads to an overall increase of the beam dimensions. Nonetheless, a 10 % weight reduction is achieved with respect to steel.
Keywords: passenger car, passive safety, side-door impact beam, lightweight materials, numerical methods, absorbed energy
Published in DKUM: 01.06.2012; Views: 2052; Downloads: 81
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