Applied Mechanics and Materials Vol. 775

Abstract: The road handling, load carrying and passenger comfort are three intension factors on car suspension’s system. They should be compromised to achieve the good the car suspension dynamics. To fulfill the requirement, the car suspension system must be controlled and analyzed. To design and analyze the suspension controller, the realistic dynamics model of car suspension is needed. In this paper, the car suspension is assumed as a quarter car and has a model structure as a neural network structure. The model is assumed consist of nonlinear properties that are contributed by spring stiffness and damping elements of suspension system. The tire is assumed has linear properties and represented by spring stiffness element and damping element. The model responses are generated in simulation term. The random type of artificial road surface signal as an input variable is used in this simulation. The results show that the trend of neuro model have the same with the response of a quarter car nonlinear model from dynamic derivation. It means that the developed neuro model structure capable to represent the nonlinear model of a quarter car passive suspension system dynamics.

Abstract: LNG carrier is seen as high risk and high economy ship. So this paper is concern about strengthening LNG carriers’ safety servicing on board, evaluated risks during this process and finding out and analyzing the risks occurring mechanisms in detail. Furthermore, the LNG releasing process is simulated by numerical models, which provides a numerical method to evaluate LNG releasing consequence. By analyzing explosive boiling occurring mechanism, the decision conditions have been included in this simulation process. By comparing the results, the effects of explosive boiling have been concluded.

Abstract: Gun barrels life closely related to the gun barrels temperature variation. On the basis of analyzing gun barrels temperature various characteristics and rules during machine-guns firing, according to gun barrels life factors and their impact on gun barrels life, test programs under different shooting combined conditions and gun barrels temperature field testing programs are designed. Through the gun barrels temperature dynamic tests and test results during shooting, analyze and put forward the relationship between gun barrels temperature rising and firing specification. Which provides the experimental basis for choice of machine-gun barrels life stresses and analysis of the life-ended rules.

Abstract: In this work, several types of reinforcement geometries of hollow-box beams for industrial applications are compared. A novel type of sandwich beams under bending and torsion uncoupled loadings is proposed as the best solution of all those that were studied. For the comparative analysis of the solutions, the models are modelled by the Finite Element Method (FEM) using the commercial software ANSYS Mechanical APDL. The feasibility of the novel beams was assessed by comparing the stiffness behavior of the beams with simple hollow-box beams in terms of deflection. An efficiency parameter was defined in order to determine the relative difference in terms of deflection. It is found that the novel geometries represent a great improvement under bending loadings, better than under torsion loadings. Nevertheless, for bending and torsion combined loadings, if bending stresses are predominant, the beams can still be interesting for some applications, mainly those with mobile parts.

Abstract: Ink is one of the important material in printing process, its features, to a great extent, decide the printing quality, and ink viscosity is one of the main parameters, the value of the ink viscosity directly affects the quality of printing. In the case of other conditions are determined, the main factor of influencing the ink viscosity is temperature. In this paper, by using the Workbench CFX fluid simulation software, the ink temperature field of two extrusion ink rollers in printing press is analyzed by numerical simulation , the influence of the ink roller speed on ink temperature and the influence of ink roller thermal conductivity on the ink temperature are analyzed,.

Abstract: By means of analytic function theory, the problems of interaction amongparallel dislocations in one-dimensional hexagonal quasicrystals are investigated. The interaction force of parallel dislocations in the material is obtained in forms of complex variable function firstly, which is the versions of well-known Peach-Koehler formula in one-dimensional hexagonal quasicrystals on parallel dislocations. These results are development of the corresponding parts of quasicrystals. Meanwhile, in this paper, we firstly give the equivalent action point of parallel dislocations in one-dimensional hexagonal quasicrystals, which be of important reference value to researching the interaction problems of many dislocations in fracture mechanics of quasicrystals.

Abstract: Laser beam welding of the absorption tubes made from stainless steel with increased boron content represent suitable production method of storage for spent nuclear fuel. This contribution presents results of weld joints investigation. The experiments were performed on borated stainless steel AISI 304 B6B with boron content 1.74 % wt. Weld joints were prepared by laser beam welding using fiber laser generator and examined by optical and electron microscopy.

Abstract: In this work, the CuInS₂ nanoparticles are successfully synthesized by microwave-assisted heating technique and further calcined at 400 °C. The morphological, structural, and optical properties of the synthesized CuInS₂ nanoparticles are investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), Raman scattering, and transmittance measurement, respectively. The SEM image shows the clear particle shape of the calcined CuInS₂ nanoparticles. After calcination treatment, the fundamental (112) peak of the XRD spectrum and a broad Raman peak mixed with chalcopyrite and CuAu structures support the improved crystallinity of the calcined CuInS₂ nanoparticles.

Abstract: Biofuels are taken to a notable option for research to energy sources because of their beneficial effect to milieu. In this study, two potential sources namely; Moringa and Rice bran oils are investigated critically as potential sources for biodiesel production. The work was classified into some steps. Firstly, biodiesel production from the two feedstock, secondly, measure the important physicochemical properties of biodiesels, and finally engine test is carried out with biodiesel-diesel blends under constant torque with variable speed. The results show that with the increasing speed, BSFC increases for both biodiesel blends and diesel and biodiesel blends shows only about 2% more BSFC than diesel. Exhaust temperature of biodiesel is about 5-8% higher than diesel but this difference is decreasing with increasing speed. It can be concluded that rice bran and moringa oil would be the feasible option for biodiesel as they satisfy ASTM standard limit and their performance is nearly similar to diesel.

Abstract: Al-Si foundry Alloys, of eutectic and hypo-eutectic compositions, are largely employed in the automotive industry because of their enhanced mechanical properties, their good flow and their relatively low melting points. We investigate in the present contribution, two different groups of alloys namely the AS13 (Al-13%Si in weight) and the AS10G (Al-10%Si-0.35%Mg in weight). Our study comprises two main parts in which, two types of heat treatments have been carried out: (i) Industrial heat treatments and (ii) isothermal annealing at 400°C and 500°C. The samples were characterized by optical microscopy, scanning electron microscopy and micro-hardness measurements. The microstructural characteristics of these alloys are mainly determined by their concentration in additives such as Mg. The AS13 alloys microstructure is characterized by the distribution and form of the eutectic silicon particles, whereas the AS10G alloys one is essentially marked by the presence of dendrites, Mg2Si precipitates and some other intermetallic compounds. Most of these compounds and precipitates are formed after heat treatments. It was observed that some other compounds such as the iron-based intermetallics, which already form during solidification, where impossible to dissolve with solution treatment. These compounds were observed to prohibit Mg2Si precipitates formation due to Mg solute trapping.