He Cheng

Wind Tunnel Tests on Aerodynamic Characteristics of two types of Iced Conductors with Elastic Support

The wind tunnel tests were carried out to obtain the variation laws of static aerodynamic characteristics of crescent and D-shape iced conductor with different wind velocities, wind attack angles and torsional elastic support stiffness. Test results show that the variation of wind velocity has a relatively large influence on the aerodynamic coefficients of crescent conductor with torsional elastic support 1. However, the influence on that of D-shape conductor is not obvious. With the increase of the torsional elastic support stiffness, the lift and moment coefficient curves of the crescent iced conductor form an obvious peak phenomenon in the range of 0 ° ~30°. Meanwhile, the wind attack angle position corresponding to the maximum value of the lift and moment coefficients of the D-shape iced conductor appear a backward moving phenomenon.

Research on Dynamic Mechanical Behavior and Damage of Steel Structure Galvanized Coating

Aiming at the impact damage of transmission steel structure tower coating in Xinjiang, the dynamic impact mechanics behavior of transmission steel structure tower coating under simulated single particle impact was studied by automatic sphere impact tester and digital image correlation experiment measuring system. The three-dimensional morphological features of impact damage were analyzed by laser scanning confocal microscopy. The results show that, with the increase of impact force, the strain peak value of the coating material is larger and larger, and the time sensitivity of the strain to peak value is different, when the impact load is large, the strain of the tested coating is the first to reach the peak value. With the impact height (strain rate) increases, yielding and ultimate strength of the specimens are increased; The stress is highly concentrated in the region near the contact surface, and its deformation decreases rapidly with increasing distance from the contact point, at the same time there are circumferential and radial cracks around the indentation.