Materials Engineering and Automatic Control II

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Authors: Hong Jie Wang
Abstract: This paper via choosing and testing the binder used in PBX explosive with basic of LLM-105. Then the experiment comes out a feasible choice using EPDM as binder to pack LLM-105 simple substance.
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Authors: Tian Lei, Guan Hong Kong, Xue Ying Cui, Rui Feng, Sheng Li Li
Abstract: The Martensite-Bainite (M/B) dual phase structure has excellent combined processing properties which can be applied to the bearing steel. Frequently, the service conditions of rolling mill bearings are so harsh that the organization and performance of the bearing materials may change during the using process. The study of structural stability of martensite-bainite dual phase structure is extremely essential. This paper determined the superiority of Martensite-Bainite (M/B) dual phase structure applied to G55SiMoV by contrasting the properties of single martensite and M/B dual phase structure. temper resistance is discussed by testing the change of organization and performance after temper.The results show that the combination property of the M/B dual phase structure are better than the martensitic structure. The G55SiMoV steel with martensite-bainite dual phase structure has a greater temperature range to ensure the tempering stability.
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Authors: Yun Jiang, Hua Dong Zhang, De Ben Hu, Xiao Chun Fan
Abstract: Based on the analysis characteristics of orthotropic composite material under antisymmetric force, a new measurement method is established which can independently measure the fringe value of optical shear orthotropic material by pure-shear experiment. Two orthotropic photo-elastic composite material beams with rectangular cross-section which fiber orientation is 0 °, 90 ° respectively are loaded anti-symmetric force, so that the anti-symmetric section is in a pure shear stress state. The fringe value of orthotropic photo-elastic shear composite material is measured . The results agree with three stripe specimens tensile experiment.
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Authors: Jing Fang Qian, Yi Yong Tang
Abstract: This article analyses the microstructures, including crystallinity, orientation degree and IR spectrum, of both Chinese jute and Bangladesh jute. Their microstructure changes after treated with acid, alkali and oxidants have been studied.
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Authors: Yong Jia LI, Ting Lei, Da Jin Yang
Abstract: Carbon decomposition of liquor afger desilication from nephine was investigated, aluminium oxide was prepard by anneal of Al (OH)3 separated out from carbon decompositon, and analysis of radionuclide of both above process was performed. The results show decomposition rate of sodium aluminate can be obtained when experiments of carbon decomposition of liquor after desilication using CO2 of hight concentration, and it is beneifit for the crystal growth of Al (OH)3, filtration and separation. Great mass of nuclide exists in the mother solution of carbon decomposition, and few into Al (OH)3, which could be regarded as wiout radioactive contamination. .
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Authors: Hai Hoang, Guillaume Galliero
Abstract: Using molecular dynamics on Hard-Sphere-like fluids subject to an external sinusoidal field inducing density inhomogeneities and undergoing a bi-periodical shear flow, we have studied the local viscosity of the inhomogeneous fluid. It has been shown that for a slowly varying density profile the local average density model combined with the well-known models proposed in the density function theory yields a good description of the viscosity profile obtained by molecular simulation. However, for a rapidly varying density profile these models are unable to describe correctly the viscosity profile obtained by molecular simulations. So, to overcome the weakness of these models we have proposed a simple model that takes into account the effect of the angle formed by the colliding molecules and the direction of the flow.
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Authors: S.A.M. Rezavand, S. Falah Kordi, T. Azdast
Abstract: The properties of plastic parts that used for outdoor applications are changed under weathering conditions. Weathering involves considering the effects of solar radiation, temperature, humidity, pollutants. By adding some additives such as carbon black, TiO2, Hals and Tinuvin, the weathering effect could be decreased. In this study, LDPE films by adding different percentages (0.1, 0.5 and 1%) of carbon black (C.B.) with 0.2 mm thickness were produced by extrusion process. Samples were cut according to ASTM D882 and to accelerate the tests, samples located in accelerated artificial weathering device up to 1400 hour. The device was set at 40°C and humidity of 50%. Required samples for tensile strength test bring out of device at selected period and tensile strength was done by 350 mm/min strain rate. The results show that samples containing carbon black have tensile stress and elongationmore than the clear films. Carbon black absorbs UV light and heat that causing to delay in broken links and destroying the molecular. The optimum percent for tensile stress was 0.5 and for elongation was 1% C.B.
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Authors: A.A. Ibrahim
Abstract: Roller burnishing process was applied to Al2O3/A356 composite specimens. The process was carried out on vertical milling machine. Effects of the burnishing process with varying process parameters on the characteristics of the machined surface and sub-surfaces were investigated. Residual stress distribution at different depths beneath the burnished surfaces, microhardness distribution, surface roughness were used as criteria to obtain the optimum burnishing conditions that give burnished surfaces with high integrity for the Al2O3/A356 composite. Results showed an improvement in surface characteristics of Al2O3/A356 composites using burnishing process. The better surface roughness was obtained with double passes burnishing, depth of penetration of 0.12 mm, and burnishing speed of 72 mm/min. Increase of number of burnishing passes increases the value of residual compressive stress and the microhardness at the burnished surface and subsurface. The microhardness slightly decreased with the increase of burnishing speed.
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Authors: Qing Mei Wang, Feng Yan Sun
Abstract: In this file, the influence of the concentration of additive MPS on the Nuclei Population Density of copper electrocrystallization on a glass carbon electrode (GCE) with different potentials has been studied. The exponential curve has been used to fit test data. From this function, the most nuclei population density of copper electrocrystallization can be estimated under certain experimental condition. From analysis results, we can see that with different potentials, the nuclei population density has different limitations. When the potential is about-0.8 Volt, the largest value of the limitation of the nuclei population density can be achieved.
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