Applied Mechanics and Materials Vols. 217-219

Abstract: ¹̄The Ni-P-W/Al₂O₃ composite coatings were deposited on the NdFeB magnetic materials surface by electroless plating method. The morphology of Ni-P-W/Al₂O₃ coatings was investigated using scanning electron microscopy. And the X-ray diffraction was used to identify the phase constituents. The interfacial bonding strength between Ni-P-W/Al₂O₃ composite coatings and NdFeB matrix was also tested. The results indicated that the interfacial bonding strength is prone to be increased while the Al₂O₃ powders co-deposited with Ni-P-W coatings. And the interfacial bonding strength would reach the highest value when the Al₂O₃ concentration is in rang of 5gL^-1 to 10gL^-1.

Abstract: Abstract. Take the lauric acid, the ethylene diamine, the chloroacetic acid, the soda ash as raw material synthesized a new type of Anionic Gemini surfactants-N, N'-double lauroyl ethylene diamine two sodium acetate, The properties of the product were characterized, and the physical and chemical properties were determined. The experimental results can be seen that the anionic Gemini surfactants can greatly reduce the oil/water interface tension, and it has good viscosity properties, Thus deduced that the Gemini surfactants is better than the ordinary surfactant better table (world) surface activity, Can be used in the tertiary oil recovery field.

Abstract: To study influence of temperature and concentration of the polishing solution and the workpiece’s diving depth and spatial orientation in the polishing solution on electrolysis and plasma polishing, orthogonal experiments consisting of four factors at four different levels were performed by using surface roughness of the specimen after 5 minutes of polishing and electric current density in the process of the polishing as experimental indexs based on the polishing mechanism and the mathematic model of surface roughness with polishing time. Primary and secondary order and regularity of the factors affecting the roughness and the electric current density are obtained by means of extreme difference method combined with variance analytic method. Optimal parameter combination focusing on the polishing effects or considering fully the polishing effects, cost and efficiency is proposed.

Abstract: Material model which could describe the Bauschinger effect is essential to accurately predict springback since strain path reverse is quite common in sheet metal forming. In this paper, a combined isotropic-kinematic hardening law which can capture the Bauschinger effect, transient behavior and permanent softening was used to model the hardening behavior. Also, the non-quadratic anisotropic yield function, Yld2000-2d, was chosen to describe the anisotropy. An inverse identificat- ion method was carried out to calibrate the material parameters by using uni-axial tension and Bauschinger simple shear tests. Experiments of cylindrical cup drawing and following split-ring tests were performed. Similar processes were carried out by numerical simulation, and springback predicted by present model was compared with experiments and that of vonMises model. The result shows that the current model significantly improves the accuracy of springback prediction.

Abstract: The solid models of the mechanical parts were built in ProE software to on the basis of the analysis of the structural characteristics and movement of the interior transmission mechanism of the hoist, and assemble the mechanical parts of the solid models through certain constraint conditions, and simulate the process of its transmission. By simulating tracing the specified key point to get the its variation curve of displacement, the stabilization of the transmission mechanism was verified; comparing the velocity curve of the input shaft and the drum, we can get a conclusion that the transmission ratios of the ProE movement simulation are consistent with the theoretical calculation value, which providing data fundmenatal for further design, analysis and manufacturing of the interior transmission mechanism of the hoist.

Abstract: The concept and operation rules of the blind number based on Unascertained Theory are introduced. This case study demonstrates the advantage of unascertained theory described in reliability optimization, and a stress-strength reliability optimization design model is built up at same time. In addition, the corresponding practical optimization calculating program is given. Test on the validity and practicability of this model is also verified by comparing the result of reliability gained from this model with that obtained from the traditional reliability-design method.

Abstract: It is difficulty to make physical experiment for compressive experiment of rock with a natural interlayer I Natural interlayer affect greatly on mechanical property of rock. In this paper, Rock Failure Process Analysis Code RFPA is used to simulate influence of natural interlayer to compressive strength of rock by numerical simulation under compression. Through numerical simulation complete stress strain curve and peak load can be obtained for compressive experiment of rock with a natural interlayer. RFPA can be effectively used to investigate anisotropy of compression for rock with natural interlayer under different confining pressure. Numerical simulation show that anisotropy of compressive strength of rock with a natural interlayer varies with inclination of natural interlayer, as the confining pressure increase, the compressive strength, the plasticity and ductility increase for rock with a natural interlayer. That provides new method to analyze and investigate mechanical behavior for multilayer composite material such as rock mass with a natural interlayer，finally Index of Anisotropy for rock with a natural interlayer are put forward

Abstract: Stress analysis and theoretical calculation of hydraulic support is studied and 3D modeling is built with Pro/E. The strength and displacement distribution of the hydraulic supports are obtained by means of finite element software ANSYS. The result can be applied to amend the design and to improve the hydraulic support’s reliability. It supplies the bases for the structure optimization of the shield hydraulic support.

Abstract: On the basis of the uniformly distributed load assumption, powder flexible cavity forming of cup shell is analyzed by MSC.Marc. The stress and strain parameters for different deformation zone are obtained. The technology is compared with rigid die deep drawing by using of point tracer method. The results prove that the forming limit can be improved and defects can be prevented when parts are formed by powder flexible cavity forming technology, which present the theoretical basis for practical application for powder flexible cavity forming technology.

Abstract: The finite element method was conducted to simulate the pharmaceutical powder compression process by using Drucker–Prager Cap model and elastic-plastic deformation theory. The effects of different friction coefficient on tablet property were systematically studied. The results show that the pressure-density curves shift towards right-hand side with slight decrease at smaller friction coefficient. The fluidity of powder remains the inverse decrease with the friction coefficient, and the density distribution changed more uniform. The maximum Mises stress becomes larger with the friction coefficient increased. The powder displacement decreases near die as the friction coefficient increasing. The research can both predict the tablet property and provide the theory reference for tablet practice production through the finite element analysis of pharmaceutical powder compaction.