Advanced Materials Research Vol. 499

Abstract: There often exists cavitation erosion, large energy loss and big noise in throttling pipelines. In this study, the three-dimensional (3D) model of the secondary throttling pipeline was constructed according to the actual structure and parameters. Adopting the finite element method (FEM) for flow field calculation, the secondary and ordinary throttling pipelines have been calculated respectively under different working conditions, and the distribution maps of velocity and pressure fields in the pipelines have been constructed. The analyzed results demonstrate the applicability of the calculating model. It has also been shown that the cavitation erosion resistance of the secondary throttling pipeline is better than that of the ordinary throttling pipeline. Cavitations first appear at the entrance of throttling pipelines, and as the pressure difference between the two ends increases, the cavitations appears inwards. This result is significant for choosing and designing the throttling pipelines.

Abstract: Flexographic printing is growing at explosive rate now. With many kinds of plate has introduced, digital laser plate becomes mainstream technique. By experiment method, the microscopic of digital laser plate was analysis, the difference of platemaking process and printing results between digital laser plate and traditional plate was detail probed and the reproduction characteristics of digital laser plate were discusses. Results showed that digital laser plate brings smaller dot gains, broader color gamut and higher printing contrast; it greatly improved the quality of flexographic printing.

Abstract: The investigation is devoted to simulate the surface roughness, plastic deformation, and residual stress resulting from shot-peening using a single ball against a flat steel plate. A sub-program for random impact was developed to analyze the effects of the repeated impacts on the process. The contact between the shot and the plate was modeled using contact elements with the penalty function type. Moreover, three relative issues were discussed. The first is concerned with the effect of the shot velocity, the second with the shot size, and the third with the friction between the shot and the plate upon the plastic zone development and unloading residual stress. The results reveal that the important role played by the shot size and shot velocity, but to a much lesser extent by the friction. In addition, we obtained that the value of the surface roughness, the effective plastic strain, and the x-stress will be saturated at the fifth impact number, from then on, the results will be changed slightly with the increasing of the impact numbers.

Abstract: Via the single-factor experiment for the seed dispensing performance of the metering disc, the main factors that affect the seeding performance are determined. Then, the important order, the optimization level, the optimal combination, and the priority level of the test factor are confirmed by taking the orthogonal test for the seed dispensing performance of seed metering disc. Following the single factor experiments and the orthogonal tests, the general rotation union design experiments are taken, and the mathematical models between the dispensing performance indices and the main factors are developed, which establish a foundation for further parameters optimization.

Abstract: The thermal conductivity & insulating adhesive was prepared by mixed with diamond particles, epoxy resin (E-20), methanol etherified amino resin, ethylene glycol monobutyl ether (BCS), mixed diethyl ester (DBE), and other additives. The influence on rheological behavior of different particle sizes, volume content of diamond particles was studied. Meantime, the effect of different concentration of dispersant and flatting agent was also investigated. The mechanism of the rheological behavior was analyzed.

Abstract: Ink printing density decides the quality of the printing. The content of resin type and additives, ink fineness and the content of primary inks were changed to improve the quality of the water-based gravure ink. Then use the proof machine of gravure to make a proof and test the printing density of the proofs. The influence factors of water-based gravure ink printing density were studied and the research shows that the ink printing density increases first, then decreases with increasing the content of the primary ink; the ink printing density increases with the ink fineness improvements; different kinds of resin has difference influence on the ink printing density; the ink printing density increases with increasing the content of resin; addition of an effective auxiliary can improve the ink printing density.

Abstract: The thermal infrared (TIR) radiation in the deformation and progressive failure of coal roadway and the mechanism of thermo-mechanical coupling were investigated. The experimental achievement showed that the surface TIR temperature (TIRT) rose non-uniformly with the load increase before the stress peak and TIR radiation caused by stress concentration, shear band and bolted area, was much stronger and higher than that caused by stress relaxation, week friction and tensile fracturing. The bolted ranges were determined from the change ratios of TIR temperature of the different areas of the bolted surrounding rocks. The infrared thermal image anomaly appeared with the macro-cracks development in the progressive failure of bolted roadways, which reflected the spatial and temporal features of infrared precursor respectively. The infrared thermal image precursors were classified as TIRT increment region and TIRT constant region to disclosure the damage evolution and localization behaviors of bolted roadways.

Abstract: Inverted siphon structure is a common water conveyance buildings, computer as a efficient computational tool is used, this paper adopt finite element method to carry out three-dimensional finite element simulation analysis for Jinliang Rive inverted siphon structure. Deducing variation law of the inverted siphon’s stress and displacement in construction process and operational process. Analysis results further verified that design scheme is reasonable and safe, it has certain reference value.

Abstract: By using ANSYS software, the finite element model of the foundation for wind turbine generator system is built. On the basis of concrete elastoplastic constitutive, the non-linear contact between the foundation stub, a steel part, and foundation concrete is introduced, the internal mechanical characteristics and law of the foundation which is under the influence of wind with unfixed direction are researched on. The interaction state is attained. The numerical analysis considering the contact status and material nonlinearity is more reasonable and the research results offer scientific basis for the domestic autonomous designing and optimizing.

Abstract: This paper adopts universal finite element calculation software to carry out simulation analysis for inclined clay-core wall earth dam of Hongxing reservoir, computer is applied in design and analysis of inclined clay-core wall earth dam. Variation law of inclined clay-core wall earth dam’s stress and displacement in construction process and operational process is researched. The research results are shown: inclined clay-core wall earth dam of Hongxing reservoir is economic and reasonable, structure is safe and reliable, and every index meets the requirements for design.