http://dspace.nbuv.gov.ua:80/handle/123456789/173405 Mon, 06 Apr 2026 05:59:47 GMT 2026-04-06T05:59:47Z http://dspace.nbuv.gov.ua:80/bitstream/id/518249/ http://dspace.nbuv.gov.ua:80/handle/123456789/173405 http://dspace.nbuv.gov.ua:80/handle/123456789/173435 Application of Taguchi Approach to Optimize Laser-Arc Hybrid Welding Parameters of Galvanized Steel Bang, HanSur; Bang, HeeSeon; Na, M.-J.; Jeon, G.-H.; Kim, G.-S.; Kim, B.-R. This study aims to establish the weld quality of the Nd:YAG laser-MIG hybrid welding on galvanized steel (SGACC60). In order to do so, the Taguchi analysis optimized the laser-arc hybrid welding process for SGACC60 by varying four parameters: welding speed, welding current, laser-arc distance and shielding gas. The experiment produced 18 combinations of these four essential welding parameters, which were estimated in terms of ultimate tensile strength, welding depth and width ratio, and hardness. The optimum result exhibited that the tensile strength of welds was approximately 101% of that of the base metal, and that their hardness was within the acceptable range (the maximum value 350 Hv). Fri, 01 Jan 2016 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/173435 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/173434 Experimental and Numerical Analysis of Normal and Lateral High-Velocity Impacts on Carbon Fiber-Reinforced Polymer Laminates Huang, T.; Liu, Z.C.; Wang, Y.L. This paper examines the effects of normal and lateral high-speed impacts on carbon fiber-reinforced polymer laminates. Experimental tests were conducted at varying velocities (120–200 m/s), and the differing damage modes between normal and lateral impacts were analyzed. Dynamic finite element analysis was performed to simulate the damage process using the finite element software ABAQUS. The simulation shows a good correlation with the experimental results. Fri, 01 Jan 2016 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/173434 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/173433 The Sources and Affecting Factors of Creep Threshold Stress of Magnesium Based Composite Tian, J. Tensile creep experiments were carried on AZ91D magnesium alloy and aluminum silicate short fiber reinforced AZ91D magnesium matrix composite. The creep threshold stress of AZ91D composite depends on the Al atoms solute atmosphere, the bearing and transferring force of short fiber. Threshold stress decreases with increasing temperature, increases with the increase of short fiber volume fraction and the load transfer coefficient , but the extent of increase decreases with the increase of the amount of β-Mg₁₇Al₁₂ precipitation phase. The load transfer coefficient α characterizes the bearing and transferring capabilities of short fibers. As a result, the mathematical model of threshold stress in the magnesium matrix composite is obtained. Fri, 01 Jan 2016 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/173433 2016-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/173432 Experimental Study and Finite Element Analysis of Critical Stresses of Reinforced Thermoplastic Pipes under Various Loads Li, G.H.; Wang, W.J.; Jing, Z.J.; Ma, X.C.; Zuo, L.B. In this paper, reinforced thermoplastic pipes (RTP) were studied under various loads. A total of five groups of specimens were designed to study the mechanical properties of RTPs under internal pressure, bending, a combination of internal pressure and bending moment, external pressure, and tension. This study obtained the bursting pressure of RTPs under internal pressure, the minimum bending radius under the bending moment, and the failure pressure under external pressure. At the same time, the mechanical properties of RTPs under various loads were analyzed using the finite element analysis. Analytical results agree well with the experimental ones. The finite element model established in this paper can be used for further research on the mechanical properties of RTPs. Fri, 01 Jan 2016 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/173432 2016-01-01T00:00:00Z