Applied Mechanics and Materials Vols. 423-426

Abstract: The electroless plating technics of copper on plastic substrate was researched, and on this basis, the Ni-W-P alloy plating technics on aforementioned plastic substrate was researched. The optimum electroless plating technics, plating technics and bath were found. The coating made in optimum technics was excellent in corrosion-resistance, wear-resistance, oxidation-resistance, and with a smooth, fine, shining surface. It was proved that the 8.1% phosphorus in the coating and the coating was amorphous crystal by determinations, the combination force between the substrate and the coating was very good, the properties of coating to resist corrosion and abrasion were 4 times better than that of Ni-P alloy by the tests. The coating was finery in ornamentally also.

Abstract: Based on the analysis of multi-layer winding arrangement characteristic of the wire rope in Lebus drum, the experimental study is carried on wear distribution of the wire rope in parallel grooved multi-layer winding. The result shows that, the wire rope is arranged regularly in each drum area in parallel grooved multi-layer winding; the wear of wire ropes in crossover zone is more serious than that of the parallel zone; in the same-layer wire rope winding in crossover zone, the wear damage during the wire rope winding in crossover zone at the end of each-layer drum is the most serious.

Abstract: Amorphous InGaZnO(a-IGZO) films were deposited on the glass substrates with Al/Mo/ITO films separately using magnetron sputtering and photograph methods,to form resistance structures between a-IGZO films and Al/Mo/ITO films.These samples were annealed in the air and N₂ ambience in a series of temperature separately.The results show that regardless of N₂ or air ambience,samples annealing at 250 degrade,IGZO films show a good ohmic contact characteristic withAl/Mo/ITOmaterials.And,IGZO films have a better ohmic contact characteristic with ITO/Al than Mo. The transmittance of the IGZO films annealed is better than the transmittance of samples without annealing.And ,the transmittance of samples annealed is rising with the increasing of annealing temperature. Considering the optical and electrical properties of IGZO films, we suggest that 250 centi degrades is a suitable temperature for annealing.

Abstract: In the present paper, an effective method for detecting the cold weld defects in the thermal fusion weld of high-density polyethylene (HDPE) pipelines based on microwave technique is proposed. Using a microwave testing system, HDPE piping welds containing cold weld defects caused by insufficient heating time were examined by frequency sweep within the range of 9.2-9.9 GHz. At the frequencies that were most sensitive to the cold weld defects, the measured reflection coefficient S₁₁ showed greatly different values between the good weld and those containing cold weld defects. The readily detectable differences in S₁₁ value make the detection of the cold weld defects possible and feasible. This work provides insights for non-destructive testing of technical defects in HDPE piping welds.

Abstract: Harmful low molecular weight substances in fifteen commercially available disposable cups were qualitatively analyzed. Contents of several suspected low molecular weight substances containing 2,6-Di-tert-butyl-4-methylphenol,Oleamide, Dibutyl phthalate in 15 disposable cups were quantitatively analyzed. The amount of igration of low molecular weight substances (DBP) in three food simulants was analyzed.

Abstract: Hydraulic engineering metal structures are susceptible to corrosion because of their chronically work in special environment. Water-borne inorganic zinc-rich coatings, owing to their excellent corrosion resistance and environmental performance, are suitable to be used in hydraulic engineering metal structures. In the paper, organic lotion and flaky zinc are used to upgrade the properties through modifying their filler and film. The experimental results show that the water-borne inorganic zinc-rich coatings with flaky zinc as filler and modified potassium silicate as film materials are provided with high durability and good mechanical character.

Abstract: The HTHP completion packers slip is a key element in ensuring the reliability of the packer. It plays an important part in supporting and locking the seal bore after anchoring in the casing wall. When the slip in touch with the casing, the interaction force between them occurs, and the supporting function of slip relies mainly on the interaction with the casing. This article analyzes the depth of slip into the casing based on the theory analysis and ANSYS finite element analysis. It approves that the biting depth of the slip increases with the load, and with the increase of tooth number, biting depth is gradually reduced. At last, we get the biting depth of the slip when the packer seated, which is 0.5mm~0.7mm. Besides this, we also analyze the VONMISES stress of the slip and the casing system and find that with the increase of tooth number the tooth stress gradually reduced, and that the slip biting depth and tooth stress gradually increase with the load.

Abstract: Paper presents an analysis of possible relationships to calculate the roughness parameters Ra finishing with rotating parts. Based on the selection of variables involved, wanted variables and factors to establish differential equation. The equation contains in addition of the factors also the constant, which must be established experimentally. For this case, it is appropriate to use the method of planned experiment, which would be extended to a new method for determining of various mathematical relations for Ra. The presented methodology can be applied to the determination of Ra with other methods of finishing machining, especially with the grinding.

Abstract: In this study, advanced high manganese austenitic steel sheets were welded by resistance spot welding at different welding parameters. The effects of welding current, clamping force, number of the current impulse, and duration of each current impulse were examined. Based on Taguchis method, an L-27(3¹³) orthogonal array was employed for carrying out resistance spot welding tests. The welded sheets were subjected to tensile-shear tests in order to determine the strength of the welded joints. Basically, the results showed that tensile-shear strength increase with clamping force at the medium and high effective welding time (>400 ms). However, the occurrence of micro cracks within the welded joints may justify the scattering of tensile-shear strength values.

Abstract: According to kiln structure and material movement features, considering convective, radioactivity, conductivity and various phase change and chemical reactions, a series of comprehensive models are built for quantifying the thermal fluxes from the gas to the material bed and the heat loss from outer shell to the atmosphere in the rotary alumina kiln. The results show that the temperatures of outer shell accord with test results; the temperature distribution rule of gas is the same with that of materials, but the gas temperatures are higher; it is feasible to use the model to improve alumina kiln performance.