Abstract: The present work discusses about the introduction of silver interlayers in dissimilar friction welding process. The characteristics of silver interlayer influenced friction weld are compared with the silver free dissimilar friction welding process. Particle fracture occurs commonly in welding process. It leads to poor quality of welds and decreases the strength of the weld which creates brittleness. Friction welding process itself reduces the particle fracture but for more precise and reliable welds, silver interlayer can be used. The introduction of silver interlayer not only reduces the particle fracture but also reduces average particle radius and leaves the particle volume fraction unchanged. So the friction welding process with silver interlayer produces more efficient welds. From all the considerations it is concluded that stable strong and friction welds with less particle fracture can be produced by the influence of silver interlayer in dissimilar friction welding.
Abstract: Slewing bearings are the basic structural components widely used in construction machinery industry. Their stress status and distribution have great influence on the service life. A finite element approach for a single-row slewing bearing is established based on the bilinear isotropic model. The stress status at different loading conditions is simulated with the bearing geometric and material parameters. The result shows that the numerical simulation is reasonable in comparison with the analytical result obtained by Hertz’s theory and provides reliable design guideline for slewing bearings.
Abstract: Etch pit is a common local etch on inhaul cable. Etch pit on the surface of steel wire can produce pits and lead to the appearance of stress concentration due to geometrical discontinuity in the pits area on steel wire. After studying various stress concentration analysis techniques, it is concluded P-method is the best method suitable for the stress analysis of corrosive pits. The analysis results show that the Von. Mises stress at the bottom centre of pits and stress concentration factor in the pit first decreases and then increases with the depth increase of the pits. In the research on steel wire fatigue life, when paying attention to the maximum stress value, it still needs to consider the etch degree on steel wire section. The calculated data lay a certain foundation for the life study of inhaul cable.
Abstract: The fatigue initiation and non-self-similar fatigue crack growth behavior of three notched compact tension and shear specimens of 16MnR steel under mixed mode I/II loading were investigated. The plane-stress finite element model with the implemented Armstrong-Frederick type cyclic plasticity model was used to calculate the elastic-plastic stress-strain responses. A recently developed dynamic crack growth model was used to simulate the effects of loading history on the successive crack growth. With the outputted numerical results, a multiaxial fatigue damage criterion based on the critical plane was used to determine the location of fatigue initiation. A formula of fatigue crack growth rate, which is based on the postulation that the fatigue initiation and crack growth have the same damage mechanism, was then used to calculate the transient crack growth rate and determine the non-self-similar crack growth path. The predicted fatigue initiation position, crack path and crack growth rate are in excellent agreement with the experimental data.
Abstract: Nozzle spacing is an important factor influencing the effect of high-pressure water jet cleaning. When the nozzle incidence angle, the deflection angle and the target distance are determined, the size of the nozzle spacing determines the overlap of the water jet, the overlap is too large or too small will reduce the cleaning effect. In this paper ,using CFD software to simulate the flow field inside and outside of the high-pressure water jet nozzle, analysis the jet axial velocity, pressure distribution, and discussed this changes in the case of different spacing between the nozzles when the nozzle structure are same, and choose an reasonable spacing to ensure the cleaning effect.
Abstract: The so-called laser engraving technology, by using laser processing system and computer numerical control technology to complete the automated processing in the pavilion, and the pavilion is where this series of processing technology completed. The paper briefly describes the working principle and system assembly of three-dimensional laser engraving Pavilion, and then focus on the research and analysis of its shape size and assembly combined with the ergonomics, and conclude to a user-friendly portable 3D laser engraving pavilion wich suit the China market very well.
Abstract: The brake safety is very important for passenger car development. Quick designing and matching brake system play an important role in automobile OEM. This paper presents a characteristic model for OEM to develop brake system by using of the features of subsystem or components. The model is a proper model because the structure parameters are not necessary. A brake pedal mechanics model is used to describe the relation of the input force and output force. The vacuum booster and master cylinder are modeled as a look-up table model. The hydraulic circuit model takes mainly account of the expansion and loss of hydraulic. After comparing the simulation data and test data, the conclusion that the model is accuracy can be drawn
Abstract: As a source of abundant natural resources, crop straws need to be crushed before utilization. The hammer mill is widely used in the processing areas of the straw and feed. Using SolidWorks software into modeling of the hammer mill is to break the traditional two-dimensional method of design. Thus it clearly reflects the structure of the parts and the movement of the assembly, furthermore greatly improve the design efficiency. The main components of the mill can be simulated and analyzed by the auxiliary functions of SolidWorks. According to the results, we can improve the design of structure by parameters with higher reliability.
Abstract: The paper studied capillary flow in asymmetry interior corner in the vane-type surface tension tank, and calculated it by analytical solution. Proposed a variable of equivalent corner angle to calculate the parameters of meniscus, and then analyze the capillary flow at asymmetry interior corner. A vane-type surface tension tank model is tested at drop tower to observe the capillary flow at asymmetry interior corner in microgravity condition. The test results are compared with analytical solution results to verify the theory of interior corner flow.
Abstract: A DFSS methodology DAMV which stands for Define, Analysis, MDO and Verify suitable for the design of a complicated system was proposed. The design of a diagonal impeller was taken as an example to demonstrate the implement process of the methodology DAMV, the results of which indicate that the proposed methodology is efficient.