Finite element analysis on the stress state of rope hoisting equipment based on the ABAQUS
This paper presents a simulation of the steel wire rope of a certain type hoisting equipment to explore the distributions of stress and deformation in the process of lifting heavy loads. The SolidWorks software was used to establish the 3D solid model of the 6*6+WS structure of stone cross strand wire rope for a certain lifting equipment. Then the solid model of steel wire rope was imported into the ABAQUS directly through the SolidWorks and ABAQUS interface plugin, the material properties were defined, the contact pairs were established, the model was meshed, and the constraints were applied to solve the finite element model. In the normal working range of the wire rope, axial tension of 5000 N was loaded to analyse the stress and deformation distributions. The results show that the stress of wire rope presents a space spiral distribution and the stress of the lateral steel wire of the rope strand is the largest of the steel wire rope, which will provide reference for the design and improvement of the steel wire rope.
Numerical Analysis on the Temperature Field and Structural Influence of Nickel-hydrogen Battery
Based on the mechanisms of heat and mass transfer,electrochemical reaction in a single space-use pressure vessel nickel-hydrogen battery,a three-dimensional,non-steady state heat transfer model of the battery is developed.This model includes all the parts of a battery including the pressure vessel.The temperature field of the battery is simulated by using the finite volume method and the simulation results tally with the experimental data.Based on this model,two kinds of battery design scheme are provided and evaluated on the basis of the simulated temperature field.Under the condition of no change of the battery power,the maximum temperature difference across the temperature field is the smallest when the electrode stack is placed in the middle of battery.Smaller maximum temperature difference can be obtained with larger inside diameter.The three-dimensional,non-steady state heat transfer model can be used for the engineering design and parameter optimization of nickel -hydrogen batteries.
Experimental study on bond behavior between high-strength grout and deformed steel bars
Abstract Engineers use high-strength grout to connect precast concrete members for its low shrinkage and good fluidity. This paper designed 87 central pull-out specimens using the control variable method to investigate the influence of factors on the rebar-grout bond property such as compressive strength, steel grade, bar diameter, transverse stirrups, and bond length. The test result showed that improving grout compressive strength (85.8 MPa–122.7 MPa) cannot improve the bond strength, which was different from the previous conclusions of concrete pull-out tests. Simplified formulas were presented for calculating the characteristic values of bond strength, residual strength, peak slip, and relative slip of load-holding platform based on parameter analysis. Then, a constitutive model was proposed to predict the full-range bond stress-slip curve of high-strength grout and steel bar specimens from bearing to failure. Finally, FEA models were established to evaluate the applicability and accuracy of the constitutive model.