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low yield stress and rapid work-hardening rate. These results are interpreted by the slip system activated in the different textures. A combined slip system was used to interpret the yield stress variation with the texture and the deformation mechanism was discussed. Key words: AZ31 magnesium alloy; mechanical property; slip system; deformation mechanism; grain size; texture 1 Introduction AZ31......
by dislocation slip and twinning can be greatly influenced by texture, solid solution element, precipitate and grain size. Currently, the relationship between the microstructure and strain hardening behavior... behavior; dislocation slip; twinning 为了应对全球能源与环境问题,开发比强度高且易回收的绿色结构材料是未来发展的方向之一.因此,具有低密度,高比强度和比刚度且易于回收等优点的镁合金受到国内外研究学者的广泛关注[1].目前,镁合金的使用多以铸态合金为主.与铸态合金相比,变形镁合金具有均匀细小的组织结构和更好的强韧性.因此,随着高性能镁合金的需求和发展,变形镁合金的开发......
locks form by the reactions of trailing partials of SFs meted on different slip planes. Based on the classical dislocation theory and the partial emission from grain boundaries, a new model to describe... and Engineering A, 2010, 527(16): 3942-3948. [20] LIAO X Z, ZHOU F, LAVERNIA E J, SRINIVASAN S G, BASKES M I, HE D W, ZHU Y T. Deformation mechanism in nanocrystalline Al: Partial dislocation slip[J......
Discrete dislocation plasticity analysis of dispersion strengthening in oxide dispersion strengthened (ODS) steelsAkiyuki Takahashi, Shota Sato(Department of Mechanical Engineering, Faculty of Science and Technology,Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan)Abstract:A discrete dislocation plasticity analysis of dispersion strengthening in oxide dispersion......
; accepted 15 September 2006 Abstract: According to the deformation state in skin stretch forming, an experiment was investigated to determine the critical strain, which make the slip line occur.... Then, the slip line limited curve(SLC) is available from these critical strains. Two kinds of aluminum alloys, 2024-T3 and 2524-T3, were studied, and two SLCs are gained. The application of the SLC to an airplane......
cross-slip (at low temperature) or dislocation climb (at high temperature), which is a function of temperature and strain rate, and can be described as[15] where are the reference and applied... dislocations cannot cross-slip and recombine, and k20 is a proportional constant. The multiplicative factor () is used as a fitting constant. In the hot forming of metal, the dislocation density ρ is so......
Analysis on Dissociation of Pyramidal I Dislocation in Magnesium by Generalized-Stacking-Fault EnergyQun Zu,Ya-Fang Guo,Xiao-Zhi TangInstitute of Engineering Mechanics,Beijing Jiaotong University摘 要:The generalized-stacking-fault energies are calculated to illustrate the dissociation of
DOI: 10.11817/j.issn.1672-7207.2018.01.010 基于SLIP模型的液压驱动单腿机器人竖直跳跃控制 陈志伟,金波,朱世强,庞云天,黄翰林,陈刚 (浙江大学 流体动力与机电系统国家重点实验室,浙江 杭州,310027) 摘要:针对液压驱动足式机器人竖直跳跃控制,提出一种基于SLIP竖直跳跃动力学模型实现液压驱动机器人竖直跳跃的控制策略.分析SLIP竖直跳跃动力学模型并求解其动力学微分方程得到质心运动轨迹,将关节型单腿机器人竖直跳跃髋部的运动轨迹映射到SLIP模型质心的运动轨迹,通过机器人运动学逆解得到机器人关节运动轨迹,以此驱动关节运动;同时建立关节型单腿机器人竖直跳跃动力学方程和液压驱动执行器动力学方程,应用MATLAB/Simulink软件进行动态跳跃控制仿真并进行样机试验.研究结果表明:基于SLIP竖直跳跃动力学模型的控制策略可实现液压驱动单腿机器......
Electrical Properties and Applications of (ZrO2)0.92(Y2O3)0.08 Electrolyte Thin Wall Tubes Prepared by Improved Slip Casting Method 苏文辉1,裴力1,贺天民1,吕喆1,曲志刚1,刘江1 (1.Department of Physics, Jilin... wall tubes were prepared by improved slip casting method. The length and wall thickness of the tubes are 266 mm and 0.4~0.9 mm, respectively and the relative density is 96.7%. The microstructure......
activated process performed by dislocation glide, climb or cross-slip. k2 is expressed as [11] (3) where k20 and ω... glide in the same system or either dislocation climb or cross slip between different systems. The values of k1 and k20 (in Eq. (3)) can be determined by fitting the experimental flow stress. In general......