Applied Mechanics and Materials Vols. 117-119

Abstract: The experimental design and implementation, as well as the fatigue life test of the steel C45 grooved axis warm surface rolling, have been carried out in this paper. The focus of the experiment is to study the effect of the different amount of rolling reduction and surface temperature on the fatigue life of the specimen axis.The experimental specific condition is at different temperature 20°C, 100°C, 200°C and 300°C with surface rolling reduction 0.03 mm, 0.06mm, 0.10mm, and 0.15mm respectively. The simulation results showed that the warm surface rolling process can significantly improve the fatigue life of the specimen axis; and there exist a corresponding optimum rolling reduction, in this case the fatigue life of the specimen axis achieves maximum, at different warm rolling temperatures. Finally the preferred processing parameter at 300°C with 0.15mm surface rolling reduction is obtained. This study has certain reference value for steel C45 the crankshaft undercut surface rolling.

Abstract: Based on Simplified Bishop Slice Method and by applying LHS –MC method, risk analysis of slope instability in earth dams is presented. Based on Bishop Model, the equilibrium equation is established to evaluate the slope instability risk accounting for the uncertainties arising from soil properties and water level. Cohesive force c, friction angle φ, their relation and water level are taken as random variables which have a large influence on slop instability. One example of risk analysis for dam slope instability is presented to demonstrate the validity and capability of the proposed method.

Abstract: The characteristics of the texture, dissemination grain size, mineral composition and content of the refractory hematite ore are researched systematically. The result shows that: the ore is be of colloidal texture, complex mineral contents, fine dissemination grain size, so the ore is difficult to be separated. In order to get the idea result of processing, the ore must be ginded and concentrated stagely.

Abstract: Titanium alloys have been widely used in aerospace and manufacturing industry because of their unique high strength-weight ratio, fracture resistance, and superior resistance to corrosion. In this paper, a series of experiments were carried out to research the surface integrity in grinding Titanium alloy TC11 on a milling centre with small vitrified bond CBN wheel. Nine runs involved in the orthogonal array are designed in accordance with three factors at three levels. The surface roughness Ra 0.72 um and Rz 4.73 um are obtained. Subsequently ANOVA is employed to analyze the relative importance of all control factors on surface roughness and the optimal combination of grinding parameters is gotten. The measurement of microhardness is also taken and the microhardness profile is then drawn. The metallographic analysis shows that a plastically deformed layer are formed beneath the ground surface at 0~80 um and no white layer is observed. Experimental results validate the feasibility of grinding Titanium alloys on a milling machine with a small vitrified CBN small wheel.

Abstract: The influence of static load and impact load in the same value of low stress on microstructure and micro-strain of T10 steel specimens is studied. The results show that softening and hardening phenomenon of Specimen appears alternately in the process of being loaded. Hardness value will tend to stable when loading time or impact times increase to a certain value. Compared to impact load，static load has a more well-distributed、pyknotic microstructure and a smaller variable quantity of microscopic strain.

Abstract: The influence of different materials on the formability of plastic injection molding has been studied in current work. The automotive glove box trim cover was chosen as analytical model. This study has been focused on the influence on fill time, warpage, sink mark depth and clamp force of different materials. PP+T15, PP+T20, PP+T25, PP+T30, PP+T35, PP+T40 and ABS+PC were used for analysis in this study. The injection molding processes of automotive interior trim of different materials were analyzed by using Moldflow software, the rationality of the material choice was evaluated. Merits and drawbacks of different materials were found out through the analysis done in Moldflow. There is positive influence on reducing mold cycle and negative influence on advancing the dimension stability of part by using the kind of PP materials. Oppositely, there is negative influence on reducing mold cycle and positive influence on advancing the dimension stability of part by using ABS. It can be reduce extremely the cost for manufacturing the mold, and shorten the development cycle by using this method.

Abstract: Edgewise compressive elastic modulus, side tensile elastic modulus and poisson’s ratio model of ripple structure sandwich composites were built in this paper, and the predictions of these mechanical properties were also conducted.

Abstract: A dental implant is an artificial tooth root replacement. The making of titanium alloy dental implants requires a combination of processes such as turning, milling, boring, broaching, and threading. Threading is important since the outer profile of an implant consists mostly of thread. Thread whirling is the chosen process instead of conventional threading. The procedure contains the following advantages: (1)high metal removal rate, (2)good quality, (3)obtaining final profile in one lapse, and (4)long tool life. The research focuses on all aspects of applying thread whirling on the making of dental implant, including theoretical analysis, whirling tool design, and finally cutting procedure. The machining is performed in a Swiss-type lathe, Star SR-20R.

Abstract: The forming connection and uniaxial tensile processes of flareless tube fittings with 10mm outside diameter were simulated by using Abaqus software, and a series of uniaxial tensile tests were executed. The results show that the magnitude of interference formed during the forming connection process has great influence on the connection strength, reasonable agreement was obtained between the predicted conclusion and test data.

Abstract: The microencapsulation of cajuput oil by spray drying was investigated with respect to the effects of two kinds of matrices (gum arabic and modified starch) as well as to the effects of initial concentrations of cajuput oil on its retention and stability. The results indicated that the oil retention depended on the type of encapsulating agent. Hicap100 showed higher oil retention of encapsulated cajuput oil. Further, the surface oil content of the Hicap100 powder was very low. The protective effect of microencapsulation of Hicap100 was also studied. The functional compound, 1,8-cineole, was released more slowly from the Hicap100 compared to gum arabic, especially at the level of 30% oil loaded.