Advanced Materials Research Vols. 1061-1062

Abstract: Microstructure and room temperature ductility of the TB6 titanium alloy was investigated by varying the aging temperature and the aging time.The results show that, the alloy’s contraction of area increases while the tensile strength firstly increases and then decreases by raising their aging temperature. In general, the ductility of the samples increases and the strength decreases with the increasing aging time. The optimum mechanical properties are obtained by aging at 650 °C for 2 h.

Abstract: EDM Surface Strengthening TC4 titanium alloy is a kind of very effective surface strengthen method, and its development prospect is very considerable. The medium in the discharge process has characteristic of self-similarity, which can be well described by fractals. And the discharge channels are an important factor affecting the distribution of discharge energy. The discharge process in kerosene and mixed powder dry medium have been simulated by using fractal theory. And the actual strengthening experiment was conducted in two different medium. The results prove that trajectory characteristics based on fractal theory are basically in agreement with the experiment result of EDM Surface Strengthening TC4 titanium alloy. The fractal theory can guide the EDM surface strengthening research of TC4 titanium alloy.

Abstract: This paper studied the growth morphology of the cells on the nanostructured surfaces of the bio-electrodes implanted in human patients. A transition model of the cells on those surfaces, which is the W model or C-B model, was deduced according to the effect of the microstructures on the wetting characteristics and the solid-liquid contact angle models of the microstructured surface. According to the contact angle formula of the model of the droplet on the solid surface, the formula was derived to describe the morphology of the ells on the nanostructured surface. The results of the experiments showed the impact of nanostructured to the morphology of the cells. The changes of the cell morphology on the smooth surface and the nanostructured surface showed that the cell morphology was affected by the nanostructures of solid surface, and the growth shape of cell was different when the sizes were different.

Abstract: Energy hardness is defined as energy density of material’s plastic displacement from the initial surface level. It is convenient to determine it from the kinetic indentation diagram constructed in coordinates P - h, where P is the relative load, h is the relative penetration of a spherical indenter. With that the relative energy density is equal P/h multiplied by the parameter C_p(h) , where varies within a range narrow for the constructional materials. The relative error of the energy hardness determination by this approach does not exceed 5%.

Abstract: With the development of the society, sheet metal filing cabinets have become popular in the office. When filing cabinets store too many paper documents, the interlayer splints often fail because of the failure of the small brackets below. The stress and deformation of brackets were studied by the theoretical method and the finite element method. Results show some small machining shape defects have little influence on the mechanical behavior of brackets. The failure reason of small brackets is not the strength, but the instability.

Abstract: Finite element analysis on the strength and stability with the full extension job is researched for some special truck crane. The different telescopic parts are connected by the slider, which can transfer load through mutual contact and deform. Stress concentration always appear with the traditional method, so the contact algorithm is vital to the simulation. The intensity and stability of the boom is simulated with finite element analysis with the degree coupling technology, the simulation results have significance for further optimal design of the boom.

Abstract: The goal of the submitted paper is to provide information on gear production by means of non-conventional technology to rise production effectiveness. The work is aimed to innovative methods at production of spurs by means of assisting non-conventional technology of laser, plasma and water jet cutting. On the base of an analysis of material cutting, an optimal non-conventional technology for gear manufacturing was chosen, i.e. plasma cutting. The application of the mentioned technology influences a change of the structure of the cutting surface material, which has an impact on the cutting quality and following gear manufacturing processes. The intention of the experimental research was to look for elimination of thermal impact on structure of material used for gear manufacturing.

Abstract: Now abnormal wear between brake shoe and brake drum is found easily with the bad running conditions for motorcycle. Soft tissue like ferrite and graphite in the brake drum are penetrated by the shoe fiber and falls from the surface and pushed to the inner side which causes abnormal wear. Thus material, metallographic and hardness are improved to enhance durability of the brake drum.

Abstract: Based on design dimensions for particular concaves distributed non-smooth surface, the biomimetic brake disc/pad coupling system model is established, and the wear resistant performance of biomimetic non-smooth surface brake disc/pad coupling system is simulated using finite element analysis, then compared with analysis result of smooth model. Result shows the Von Mises stress of biomimetic non-smooth sample is less than that of smooth sample, and the concaves improve the contact stress distribution in the contact area of brake disk and brake pad. Analysis results show that wear resistant performance of biomimetic non-smooth sample is better than that of smooth specimen.

Abstract: Discontinuities have an important influence on deformation and failure of rock mass in practical engineering. It is one of the key issues in modern rock mechanics to investigate geometric characteristics of joints and fractures inside the rock mass such as shape, size, location and direction etc. Based on the deep analysis of the above geometric properties, it is proposed that the stochastic fractures in the rock mass can be simulated with the random numbers generated by the Monte Carlo method. The related algorithm is designed and implemented. The correctness and effectiveness of the algorithm is verified with an example of a project. This will lay a solid foundation to further study the cutting problems of discontinuous rock block systems.