蛇形弹簧联轴器齿形结构研究

蛇形弹簧联轴器是广泛用于通用机械场合的一种弹性联轴器,通过半联轴器上的齿与弹簧的相互挤压来传递运动和动力。在分析了蛇形弹簧联轴器的工作情况下进行了基本的齿形结构设计,并对联轴器进行了有限元仿真软件ANSYS Workbench 12.0的静载分析。通过改变齿形结构的参数,对比不同参数下齿形结构的静载分析结果。明显看出齿形结构对于蛇形弹簧联轴器的重要影响,为蛇形弹簧联轴器产品开发提供了理论依据。     

Electron back‐scattering diffraction (EBSD) measurements of antigorite lattice‐preferred orientations (LPO)

Lattice preferred orientations of serpentines induce a strong anisotropy of various properties in serpentine bearing‐rocks. Lattice preferred orientations had so far been obtained only by X‐ray diffraction techniques. We have applied electron back‐scattering diffraction to the measurement of the lattice preferred orientations of antigorite in a naturally deformed high‐pressure serpentinite. This technique is very sensitive to sample preparation that can lead to surface amorphization in the case of serpentine. A polishing procedure is described that avoids amorphization and allows accurate electron back‐scattering diffraction measurements with optimized experimental conditions in a variable pressure scanning electron microscope. Results indicate that deformation leads to lattice preferred orientations characterized by extremely strong c‐axis clustering perpendicular to the foliation, as expected for a layered silicate. In the foliation plane, a significant clustering of the a‐axis is observed and tentatively attributed to intracrystalline deformation mechanisms. These data suggest that antigorite deforms mostly by gliding along the basal plane of the layered phyllosilicate structure, but that gliding may occur along directions favouring a‐axis alignment. Electron back‐scattering diffraction appears to be a reliable method for determining phyllosilicate lattice preferred orientations in deformed rocks, with potential applications for determining anisotropy of properties like seismic velocities or thermal and electrical conductivities.     

降低高铁低硅烧结固体燃耗的研究

研究了高铁低硅烧结矿的铁品位和SiO2含量与固体燃耗的关系，以及提高生石灰配比和添加蛇纹石对烧结矿产质量和固体燃耗的影响，从而找到了降低高铁低硅料烧结固体燃耗的途径。     

蛇形机器人的设计及摩擦力对其运动性能影响的分析

为使蛇形机器人的结构和运动形式能够适应各种复杂环境,研究了蛇形机器人运动性能与环境的关系及其运动控制,设计了一种单被动轮为接触面的正交串联蛇形机器人,分析了蛇形曲线参数对其运动的影响,通过实验研究了摩擦系数对其运动步态的影响,得出了蛇形机器人的前行速率随蛇形曲线参数α的增大而增大,随摩擦系数μ的增大而减小的结论,以及蛇形曲线步态参数的调节策略。     

蛇纹石和油酸作为润滑油添加剂的减摩抗磨性能

利用高能球磨机制备平均粒径约1 μm的蛇纹石超细粉体,并将其与油酸按质量比2∶1混合分散到PAO10基础油中,利用四球试验机探究其作为润滑油添加剂的减摩抗磨性能,利用白光干涉仪分析磨斑表面三维形貌,并用EDAX对磨斑表面元素进行分析。结果表明：蛇纹石与油酸混合加入基础油中具有更好的减摩抗磨效果;蛇纹石粉体与油酸混合后能够在摩擦副表面形成含有Si、Mg元素的修复膜,而单一的蛇纹石粉体在摩擦过程中不能成膜,这是因为,油酸作为分散剂能够吸附摩擦过程中产生的金属磨粒并使其分散到润滑油里,减少磨粒对摩擦表面造成的磨粒磨损;油酸有机修饰层吸附到蛇纹石颗粒表面,改善了蛇纹石颗粒在基础油中的分散性。     

Experimental and Theoretical Studies of Serpentine Microstructures Bonded To Prestrained Elastomers for Stretchable Electronics

Stretchable electronic devices that exploit inorganic materials are attractive due to their combination of high performance with mechanical deformability, particularly for applications in biomedical devices that require intimate integration with human body. Several mechanics and materials schemes have been devised for this type of technology, many of which exploit deformable interconnects. When such interconnects are fully bonded to the substrate and/or encapsulated in a solid material, useful but modest levels of deformation (<30–40%) are possible, with reversible and repeatable mechanics. Here, the use of prestrain in the substrate is introduced, together with interconnects in narrow, serpentine shapes, to yield significantly enhanced (more than two times) stretchability, to more than 100%. Fracture and cyclic fatigue testing on structures formed with and without prestrain quantitatively demonstrate the possible enhancements. Finite element analyses (FEA) illustrates the effects of various material and geometric parameters. A drastic decrease in the elastic stretchability is observed with increasing metal thickness, due to changes in the buckling mode, that is, from local wrinkling at small thicknesses to absence of such wrinkling at large thicknesses, as revealed by experiment. An analytic model quantitatively predicts the wavelength of this wrinkling, and explains the thickness dependence of the buckling behaviors.     

高强度厚规格钢板板形控制研究

针对宝武鄂钢4 300 mm宽厚板轧机轧制高强度厚规格钢板出现的“搓衣板”和“蛇形弯”板形缺陷问题,对其产生原因进行了分析。结果表明: “搓衣板”板形缺陷的形成是由于轧机机架精度不够造成轧辊辊系不稳定,高强度钢板在轧制过程中上下表面金属变形不一致而导致的,同时由于钢板头部下扣,使钢板在轧制延伸时受阻,加剧了整板“搓衣板”板形缺陷的形成。轧机主电机负荷平衡功能的投入会干预到上下主电机速度的给定,造成钢板“蛇形弯”缺陷,同时由于轧机雪橇功能的过分使用会加剧该种板形缺陷的形成。为此,提出了加强轧机机架间隙精度的管理措施,有利于轧制过程中辊系的稳定;对钢板精轧阶段压下制度进行了优化,即末道次压下率为12%~17%时,可使钢板头部板形为单弧形上翘,不会产生“搓衣板”缺陷;对轧机主电机负荷平衡功能及雪橇功能进行了优化,减少了钢板咬入阶段上下主电机速度波动,有利于钢板头部“蛇形弯”的控制。上述措施实施后,厚规格高强度钢板板形明显改善,降低了生产成本,提升了宽厚板厂产品质量和市场竞争力。     

隧道内电缆蛇形敷设特性

为限制电缆热伸缩时的轴向力及金属护套应变,以截面积为2500 mm^2的220 kV交联电缆为例,研究隧道内电缆蛇形敷设特性。在分析了初始蛇形弧幅、蛇形节距对电缆轴向力、金属护套应变的影响的基础上,确定了蛇形节距的取值范围,认为应综合考虑轴向力、施工误差和金属护套寿命等因素来确定初始蛇形弧幅。从隧道空间及支架荷载、立柱荷载等方面对垂直蛇形和水平蛇形敷设方式进行了比较,指出实践中应结合工程特点合理选择电缆蛇形敷设方式和参数。     

蛇纹石玉假皮研究

采用宝石学常规测试、X射线粉末衍射、电子探针和红外光谱等分析手段对近期珠宝市场上出现的一种蛇纹石玉雕件的假皮的宝石学特征、成分、结构及制作方法进行了研究。结果表明,该假皮是通过对蛇纹石玉表面进行酸洗、染色、浸蜡处理而得到。其结构疏松,裂隙发育,裂隙中颜色较深,但主要组成矿物仍为叶蛇纹石。