Stig Staghøj Knudsen has sailed all his life and is familiar with the conditions in high-level competitive sport. For the next three years, he will combine this insight with his extensive experience as an engineer developing flow models for ships and
Comparative study of laminated glass fins using full-scale testing, finite element modeling, and buckling formulas
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Abstract
Microstructure difference between the center and the surface caused by temperature gradient during quenching process may lead to inhomogeneous properties of large-size products. A new finite element model (FEM) is proposed in the present work to precisely simulate temperature distribution of a bainite/martensite multiphase material during water-air alternating surface quenching process. Parameters like nonlinear variation of thermo-physical parameters, nonlinear variation of heat transfer coefficient, phase transformation latent heat, and transformation kinetics were considered when developing the FEM. In particular, the experimental investigation of bainite and martensite transformation kinetics provides the basis for the accurate calculation of microstructure. The model helps identify the temperature distribution, cooling rate profile, microstructure and hardness characteristic of Mn-Si-Cr bainitic/martensitic large-size products. A quarter of axle block experiments were
Elastic cables have the advantages of desirable seismic mitigation effect, low cost, and convenient installation, and have been used widely in low-To-mid-span bridges. However, their utilization in long-span cable-stayed bridges has been limited. To study the effect of elastic cable on the seismic response mitigation of long-span cable-stayed bridges, an experimental model (half-bridge model) with a geometric similarity ratio of 1a40 was established. Both the semifloating system and the elastic restraint system were considered, and the seismic responses of the two systems under earthquake excitation were tested on the shaking table. The results demonstrated the seismic mitigation effect of the elastic restraint system, which is dependent on the characteristics of the seismic wave. The mechanism of the seismic response mitigation of the long-span cable-stayed bridge with longitudinal elastic restraint was discussed.