粗糙平板间平面镦粗的移线场的建立：用数学解析法和计算机辅助设计

通过分析粗糙平板间平面镦粗时金属的流动规律，用数学解析法和计算机辅助设计相结合，确定该塑性变形体内各点最大剪应力的轨迹，即建立滑移线场。     

可压缩体的滑移线场理论

从理论上建立了可压缩体的滑移线场理论，并给出了解析实例。研究表明：在平面应变条件下，可压缩体内的两族滑移线不仅不正交，而且随着平均正应力的不同而变化；可压缩体的平面应变问题可以直接采用现有的致密体的滑移线场来求出。     

夹持式镦粗过程夹紧力的分析研究

应用滑移线理论和金属的塑性变形理论,分析研究圆柱体镦粗过程中的夹紧力的计算方法,并与试验结果进行比较.计算结果与试验结果吻合.     

滑移线速度场的分析及切削模型的建立

本文分析了滑移线速度场速度方程的三种不同表示方法：直角坐标法、极坐标法和滑移线法．并运用滑移线的理论，建立带限制前刀面刀具切削时滑移线场的切削模型，推导出其速度方程．     

负前角刀具切削加工机理的有限元仿真分析

利用有限元仿真方法对-80°-0°刀具负前角时切削过程进行二维正交切削仿真试验,研究了负前角刀具切削加工过程和切屑产生的必要条件以及不同刀具负前角下切削力分量的主导作用和相互影响规律。结果表明:负前角切削过程中首先产生刀尖点处的集中变形点a;随着切削进行,产生自由端面上的集中变形点b;集中变形点a、b相向扩展,形成集中剪切滑移带,进而产生切屑;负前角切削加工中,存在临界负前角使切削加工不产生切屑;随着负前角绝对值增大,加工所需的切削力也随之急剧增大,越来越难产生切屑。     

锥形凸台成形的一种叠加滑移线场力学模型

分析了锥形凸台在不同体积成形工艺中的成形机理，基于模块化思想将锥形凸台的成形过程划分为挤压成形与角部充满两个特征时段；将上述两个特征时段的滑移线场力学模型有机联结，构建了锥形凸台成形过程的一种叠加滑移线场力学模型；介绍了叠加滑移线场力学模型的应力场与变形力的求解方法。该模型丰富了金属体积成形过程的特征单元库，可套用于局部成形的应力场与变形力求解，实现局部成形的模具优化设计。     

滑移线基本理论及其在金属切削加工中的应用

滑移线理论是一种图形绘制与数值计算相结合的求解平面塑性流动问题的理论方法.应用塑性力学的滑移线理论分析了金属切削过程中变形滑移现象,得到金属切削过程中切削力的一种新的计算方法,给出了切削力的计算公式.这一分析方法和计算公式可较合理地分析计算切削力,对解决工程实际问题有一定的指导意义和应用价值.     

一个考虑刀具切削刃钝圆影响的正交切削模型

对正交切削过程的力学边界提出了合理假设,用试探法建立了考虑切削刃钝圆影响的滑移线场模型及相应的速度场模型。分析表明,该模型基本满足静可容和动可容的要求。并采用这一模型对切屑卷曲现象进行预测和分析。     

铜铁合金金属复合摩擦材料冲击破坏机理研究

研究铜铁合金复合摩擦材料破坏机理。该材料在压制烧结时 ,已含有孔隙和裂纹 ,是一种含损伤材料 ;该材料在冲击下的破坏是滑移剪切破坏 ;裂纹的形成除初始裂纹外 ,冲击时裂纹首先沿着颗粒张开 ;同时也可看到铜在不同方向晶粒上的滑移线形貌 ;在裂纹的缝隙处有柔性连接 ,表示了该材料中金属合金在起作用。     

带传动承载能力的模糊概率设计

本文根据模糊概率理论，结合带传动承载能力的传统理论，探讨了带传动承载能力的模糊概率设计方法，并给出了设计实例     

Effects of flying height deviations on glide height tests for manufacturing hard disks

In this study, theoretical analysis and experiments were carried out to investigate the effects of avalanche-point deviation and the deviation between the calibration and test-flying heights during the glide head calibration in the glide height tests for manufacturing hard disks. To obtain accurate glide height test results and improve the reproducibility of the test, flying height control should be carried out by limiting the acceptable deviation range of the flying heights of the glide heads. When the avalanche-point deviation is zero, the test results using different calibrated rails (or heads) are the same when they are used to detect the same defect. To avoid wrong test results due to avalanche-point deviation, the test-flying height should be the same as the calibration flying height because the difference of the output voltages of any two rails (or heads) is zero in this case. If these two deviations cannot be eliminated completely, the calibration and test-flying heights should be carefully selected because the error still can be minimised depending on the selection of the flying heights.     

Fe3Al金属间化合物的有序度截留与力学性能

运用固体与分子经验电子理论(EET)对Fe3Al的两种晶体结构DO3和B2的滑移能进行了计算,结果表明B2结构在室温下具有较好的塑性和较低的强度.据此对长程有序金属间化合物Fe3Al进行有序度截留(淬火处理)研究.X射线衍射和强度试验表明有序度截留可以明显截留Fe3Al的有序度,截留后的试样强度和硬度下降,材料的力学性能得到改善.     

半铠装滑动测温传感器及其故障诊断的研究

结合大型旋转艇体温度测试的研究，提出了一种新型的半铠装滑动测温传感器结构。在分析其故障特征的基础上，综合考虑测温系统的冗余性，进一步提出了基于时间序列和专家系统相结合的故障诊断策略。经实验仿真和实际工程的使用情况表明，文章所给出的滑动测温方法及传感器故障诊断策略是切实可行的，同时为其他类似的测试系统提供了新的借鉴。     

Elevated temperature deformation behavior in an AZ31 magnesium alloy

An AZ31 magnesium alloy was tested at constant temperatures ranging from 423 to 473 K (0.46 to 0.51T _m ) under constant stresses. All of the creep curves exhibited two types depending on stress levels. At low stress (σ/G<4×10⁻³), the creep curve was typical of class A (Alloy type) behavior. However, at high stresses (σ/G>4×10⁻³), the creep curve was typical of class M (Metal type) behavior. At low stress level, the stress exponent for the steady-state creep rate was of 3.5 and the true activation energy for creep was 101 kJ/mole which is close to that for solute diffusion. It indicates that the dominant deformation mechanism was glide-controlled dislocation creep. At low stress level wheren=3.5, the present results are in good agreement with the prediction of Fridel model.     

Possibility of surface force effect in slider air bearings of 100 Gbit/in hard disks

The recording density has been increasing in a high rate of 60% per year in the last 10 years. In the next several years it is expected that the recording density will be 100 Gbit/in² and then 1000 Gbit/in². It is said that a spacing of about 5 nm will be necessary for 100 Gbit/in². For two solid surfaces with such a small spacing, it is expected reasonably that the surface force will come into action. In this paper, numerical analysis was conducted to explore the possibility of the surface force for the slider air bearing working with respect to the glide avalanche. The numerical results show that surface force reduces the stiffness of the slider air bearing and the load carrying capacity as well. It is worth noting that, although the decrease in the load carrying capacity may not be significant, the reduction in the stiffness may be critical for many cases. The reduction in the stiffness of slider air bearings due to the surface force may be one of the most important mechanisms of the glide avalanche. The predicted take-off height to overcome the surface force is about several nano-meters. Increasing the pitch angle tends to decreases the take-off height. A lubricant film of about 1 nm will reduce the risk of the glide avalanche in some extent, but increasing the film thickness has little effect.     

Tribology of X-1P vapor lubricated hard disks

The tribological characteristics of vapor lubricated X-1P films on carbon coated disks were investigated as a function of lubricant thicknesses (0.2–2 nm) and compared with traditionally dip-coated X-1P and PFPE films. Glide and flyablity tests were performed and the lubricant redistribution in the ‘wear track’ was investigated using a surface reflectance analyzer (SRA). A critical lubricant thickness was found to exist for X-1P below which lubricant accumulation was observed, while lubricant loss was found to be present if the thickness of the lubricant film was greater than the critical thickness.     

车身焊装生产线焊装主线设计研究

焊装主线是汽车焊装生产线的核心部分。介绍了汽车焊装生产线焊装主线的总体设计方法,并以某汽车制造公司最新开发设计的微型面包车的焊装主线总体布置图为例,具体进行了说明,对焊装主线的关键设备－传输系统及合装台的设计进行了介绍。     

精益生产方式下生产线平衡的研究

生产线平衡是影响企业发展的重要因素．精益生产方式的理论为解决生产线平衡问题提供了一个新的且切实可行的方法。运用精益生产理论对生产：线五要素进行分析,找出产生瓶颈工位的原因,提出解决方案,调整整条生产线,将企业的各种浪费降到最低,从而达到使各工位负荷尽量相等、提高生产线平衡率的目的。     

基于共焦显微条件下线结构光共焦显微术的研究

美国的Minsky在20世纪50年代末提出共焦显微术的概念以来,尽管共焦显微术可以获得更高的分辨率,但不仅成像速度慢,而且需要使用光电增强器对采集光点信号进行增强,导致制造成本过高,所以除一些成像质量要求极高的显微系统外,其他的显微系统很少应用。讨论了线结构光共焦显微术的原理、优缺点以及影响性能的几个重要因素,并介绍其最新的研究状况。