http://hdl.handle.net/20.500.14044/33858 2026-07-21T07:00:05Z http://hdl.handle.net/20.500.14044/33434 Monitoring of Strains and Deflections of a Steel Cantilever, using a Contactless Measurement Method Galdun, Ladislav; Ali, Mohamad Al; Platko, Peter; Kmet, Stanislav; Kvočák, Vincent; Varga, Rastislav The aim of the experimental and analytical work was to monitor and analyze the strains and deflections of steel cantilevers using a bistable glass-coated microwire, as a contactless measurement method. For verification and comparison, the results obtained from the applied bistable microwire (Fe75Si 9B 10P 5Tb 1), the results of a standard resistance strain gauge and dial indicator were used. Since the microwire used, has a metallic (magnetic) core, verifying the possibility of separating the influence of the parasitic external magnetic field from the measured deformations, was the first goal of the implementation of the bending test on steel cantilevers. Another goal was to find a relationship between the switching field of the microwire and the strains measured by the strain gauge, depending on the applied load during the experimental test. Both goals were achieved within this research. 2024-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/33433 Optimized Trapezoidal Stiffened Plates under Uniaxial Compression with a Sudden, Rapidly Applied Pressure Szirbik, Sándor; Virág, Zoltán This paper is devoted to the forced vibration analysis of optimized trapezoidal stiffened plates with simple supported conditions on the four edges of the base plate. The purpose of the finite element analysis is to investigate the transient forced vibrations of stiffened structures subjected to uniaxial compression due to the reason of rapidly applied pressure over their base plates, thereby identifying potentially dangerous cases and minimizing the possibility of failure. In this study, the numerical analysis is performed for such a design of this kind of welded plates which have already been optimized for lateral pressure and uniaxial compression as static loadings. The objective function of the optimization to be minimized performed with the Excel Solver program is the cost function which contains material and fabrication costs for Gas Metal Arc Welding (GMAW) welding technology. The eigenvalue extraction is used to calculate the natural frequencies and mode shapes based on the Lanczos iteration method then the transient response is determined using the modal superposition method from the first few mode shapes. The welded structure is made of two grades of steel, which are described with different yield stress while all other material properties of steel remain the same. 2024-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/33431 A Proposal of a Heat Input Model, for Heating Correction, on Welded Steel Structural Members Xiaoyu, Guan; Yujiro, Tokumaru; Mikihito, Hirohata A series of experiments and analyses were conducted for evaluating a simple heat input model, for heating correction on welded steel structural members. The heating experiment on steel plates, with different thicknesses, was simulated using thermal elastic– plastic analysis. The temperature histories, deformations and residual stresses of plates could be simulated by the simplified heat source model, proposed in this study. The applicability of the heat source model was verified, by simulating the heating correction for T-shaped fillet welded joints. 2024-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/33429 Full-scale Fatigue and Burst Tests on Notched Pipeline Girth Welds, under Complex Loading Conditions Lukács, János; Dakhel, Ahmad Yasser Hydrocarbon transporting pipelines contain a large number of girth welds, which are made under field conditions. The construction and the long-term operation often result in additional stresses to the internal pressure in these girth welds. The experience of the damage that has occurred and the requirement for safe operation necessitate full-scale tests to model and analyze these effects. The article presents a test system developed to investigate full-scale pipeline sections subjected to cyclic internal pressure and static external bending. The results obtained from tests of girth welds, with artificial circumferential and axial notches, are described herein. The results are used to draw conclusions on the load bearing capacity and integrity of the girth welds. 2024-01-01T00:00:00Z