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410075, China) Abstract: Based on generalized Hoek-Brown yield criterion, and taking into the effect of seepage account, the numerical solution for radius of plastic zone, radial displacement of tunnel wall and stresses around circular opening were derived. The relation curve between hydraulic head pressure difference h and radius of plastic zone R/e around circular opening for different types of rock......
Heidelberg 2012 Abstract: The design of notch and barrier was optimized in order to improve the characteristics of constant torque while minimizing the cogging torque that occurs as a result of teeth.... The position and width of notch, which can offset cogging torque, can be calculated with energy distribution of air-gap using Fourier series. The optimized model demonstrates a 60% decrease in the cogging......
of the models and possible future research. Key words: precipitation thermodynamics; precipitation kinetics; strengthening models; precipitate; shear mechanism; by-pass mechanism; critical radius 时效铝合金因为其轻质高强的特点......
410083, China) Abstract: A new kind of longitudinal modified equal radius arc crown gear tooth surface was proposed, according to the principle of longitudinal modification derived equal radius arc... contact analysis (TCA); longitudinal modification; alignment error; equal radius arc crown gear 渐开线圆柱齿轮传动因其结构紧凑,便于制造和维护以及传动平稳等特点而被广泛应用,在齿轮传动中,由于安装误差和弹性变形的影响,使齿面发生边缘接触和应力集中,易造成齿面失效[1].齿向修形能降低对安装误差的敏感度......
distributions near the notch tip have shown that the maximum principal stress increases with the notch root radius decreasing. Key words: 5Ni-16Cr-Mo steel; slow strain rate test; thermal desorption... concentration under stress-driven diffusion condition is different with the size of notch root radius. Accordingly, it is important to understand the stress-driven hydrogen diffusion and accumulation......
to obtain zero error intersection of the tools edge. Importing swallowtail trough model method and utilizing the technique of minimum radius control point, parametric design is realized based on feature..." intersection; minimum radius control point 成形车刀是广泛应用于各种车床及自动线加工的专用刀具, 可用于加工各种回转的成形表面, 主要用于大批量生产. 采用成形车刀加工精度稳定, 刀具使用寿命长, 刃磨简便, 加工精度高, 表面粗糙度可达到2.5~10 μm, 生产效率较高[1, 2]. 但是, 采用传统的图解法和计算法, 设计精度和效率低. 随着计算机技术的发展......
: In response to the deficiencies of BitTorrent, the concept of density radius was proposed, and the distance from the maximum point of radius density to cluster center as a cluster radius was taken to solve the too large cluster radius resulted from the discrete points and to reduce the false positive rate of early recognition algorithms. Simulation results show that in the actual network environment......
, as well as the critical radius of nucleus have been investigated. The results showed that with the increase of cleanness of liquid iron the undercooling and thermodynamic driving force increased, while the nucleus forming energy and critical radius of nucleus decreased. Key words:pure iron; cleanness; undercooling; thermodynamic parameter; [全文内容正在添加中] ......
on the cutterhead at a small radius and thus bears complex side force. Given this fact, the formation mechanism and change law of the side force suffered by the center cutter were studied. Based... the rotary cutting process. The smaller the installation radius is, the greater the cutter side force will be. In a working condition, the side force of the innermost center cutter is 11.66 kN, while......
cutting mechanical model of disc cutter was established and the influence of installation radius, the phase difference and the cutter space on the mechanics of disc cutter were analyzed. The results show that on the same radial line of tunneling interface, the boring distance of cutting tools installed on a different radius is not equal. The cutting radial line of tunneling interface......
