压弯复杂应力下焊趾局部应力-应变研究

通过对模拟结合壳典型部位的焊接试件进行加载试验,分析了压应力对局部应力应变特征的影响,结果显示,焊趾处名义应力相同条件下,局部应力应变值与施加的载荷形式有关.同时,对此试件进行的弹塑性有限元分析,得到了与试验结果基本吻合的规律.由此得出,压应力与弯曲应力的比值较小时,对焊趾处局部应力应变产生的影响可忽略;比值较大时,产生的影响不可忽略.     

不锈钢冲压加工中存在的问题及技术对策

本文在论述不锈钢特性的基础上,分析了不锈钢冲压加工中出现的问题,找出了切实可行的解决问题的技术措施,并指出了不锈钢冲压技术的发展方向.     

The loss of a jack-up under tow

The events leading up to the capsize and total loss of a jack-up under tow are briefly summarised. The investigation of the causes of this are described in some detail. It involved model tests, finite element analysis, stability calculations, a determination of motions by analysis of newsreel videos taken at the time and close examination of an underwater film taken of the wreckage.

The likely sequence of structural failures leading up to the capsize is established. These are summarised and the lessons learnt from the enquiry highlighted.     

变速比变厚齿扇齿面滑移及接触应力特性的理论分析

本文以齿条齿面共轭线方程及变速比变厚齿扇齿面数学模型为基础，提出了汽车循环球式转向器变速比变厚齿扇齿面滑移及齿面接触应力特性的离散数值计算方法；提示了速比变化比值对齿面滑移及齿面接触应力特性的影响。     

Wheel/rail interface management in heavy haul railway operations—applying science and technology

The primary objective of the paper is to review science and technologies that have been developed by various scientists and engineers over the years and that have made it possible to push the limits within the wheel/rail interface in the heavy haul railway environment. After describing the wheel/rail stress-state and its consequences, preventative and corrective measures that can assist in optimising wheel and rail life, and thus reduce costs, are reviewed. The significant contribution of measurement and monitoring technologies to quantify the stress-state of the wheel/rail system is highlighted. Finally, a brief review of the fundamentals of contact mechanics, vehicle dynamics and wheel/rail interface analysis software is given.     

基于温度应力等效的基顶当量回弹模量换算方法

在水泥混凝土路面温度应力计算中采用的基顶当量回弹模量,是基于基顶弯沉等效为原则换算得到的,这种换算原则并不能真实反映基层对路面板温度应力的影响规律。利用有限元法对温度应力进行了大量计算,在此基础上建立了以温度应力等效为原则的基顶当量回弹模量换算方法。与有限元解比较,结果表明该换算方法的精度完全能满足工程计算的需要,其成果可供规范修订时参考。     

钢轨轨头三维应力有限元分析

应用有限元分析程序ANSYS5．5对60kg·m-1钢轨轨头接触应力和最大负弯矩截面的弯曲应力进行了分析计算，并给出在实际机车轮压作用下有关截面上的应力数值和分布规律，为今后研究钢轨轨头近表面区域缺陷的发展规律及预测伤损钢轨的使用寿命提供了依据。     

准双曲面齿轮有摩擦承载接触分析

本文推导了准双曲面齿轮有摩擦承载接触问题的数学规划解法，首先采用有限元方法计算工作齿面网格结点的柔度张量，并通过插值和叠加获得一对啮合齿在各接触位置上接触椭圆长轴离散点的综合柔度，然后结合齿面几何因素（包括齿面间隙，滑动系数，法矢和切矢对于转轴的矢径等）建立了接触问题的线性规划模型，采用载荷增量法求解了摩擦的接触变形过程，本文还以一对准双曲面齿轮为例，进行了整个啮合过程的承载接触分析。     

球笼式等速万向节接触应力分析与计算

球笼式等速万向节是前置前驱动轿车的关键部件之一，其性能和寿命与接触应力密切相关。对球笼式等速万向节的接触应力进行了分析，给出了计算方法，并对某一车型的ＢＪ７５型球笼式等速万向节进行了计算，结果表明内滚道接触应力大于外滚道，内滚道易于磨损。