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移动荷载作用下结构弹塑性安定分析方法及其应用研究 被引量:5
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作者 庄妍 王孟 王康宇 《湖南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2018年第7期93-102,共10页
为了研究移动荷载作用下结构的安定性问题,以Melan静力型安定定理为基础,通过构造满足静力平衡条件的最佳残余应力场,并求解移动荷载作用下结构中的真实弹性应力场,发展了一种弹塑性安定性计算方法.该方法摆脱了传统安定性分析方法中的... 为了研究移动荷载作用下结构的安定性问题,以Melan静力型安定定理为基础,通过构造满足静力平衡条件的最佳残余应力场,并求解移动荷载作用下结构中的真实弹性应力场,发展了一种弹塑性安定性计算方法.该方法摆脱了传统安定性分析方法中的数学规划运算,解决了计算中维数障碍的问题.通过与前人研究结果对比,说明本方法的正确性.基于此方法,研究了列车荷载直接作用下路基的静力安定极限的第一类上限kI和静力安定极限kSD,进行轮载间距L和铁轨间距B对路基安定极限的敏感性分析,发现当轮载间距L和铁轨间距B大于等于10a时,轮载间距L和铁轨间距B对路基安定极限不再产生影响;通过分析材料泊松比v和内摩擦角φ对安定极限的影响,表明安定极限随着路基泊松比的增大略有减小,但随着内摩擦角的增大而有明显增加;并提出了一种基于安定极限荷载包络图的路基安定性评价方法和设计方法,据此可对铁路路基进行设计指导和安全性评价. 展开更多
关键词 安定分析 铁路 赫兹荷载 Melan静力安定定理 移动荷载 弹塑性材料
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Influences on Generation of White Etching Crack Networks in Rolling Bearings 被引量:3
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作者 Joerg Loos Toni Blass +2 位作者 Joerg Franke Wolfram Kruhoeffer Iris Bergmann 《Journal of Mechanics Engineering and Automation》 2016年第2期85-94,共10页
In rare cases rolling bearings fail by WEC (white etching crack) damage before reaching their calculated rating life, if so called additional loads are applied on the bearing in addition to the normal Hertzian stre... In rare cases rolling bearings fail by WEC (white etching crack) damage before reaching their calculated rating life, if so called additional loads are applied on the bearing in addition to the normal Hertzian stress (PHz). A number of additional loads have been identified by means of tests with rolling bearings. These can be small direct currents as a result of electrostatic charge or large alternating currents from inverter-fed drives that unintentionally flow through the bearing. WEC damages can also be initiated by a pure mechanical additional load which is dependent on factors including the bearing kinematics but also on the dynamics of the drive train. The current state of knowledge on this subject is presented and taken as the basis for developing a hypothesis on the WEC damage mechanism. If load situations critical for WEC cannot be avoided, the risk of WEC can be considerably reduced by the selection of suitable materials and coatings as well as, in some cases, of suitable lubricants. 展开更多
关键词 Rolling bearing WEC (white etching crack) WSF (white structure flaking) hydrogen fatigue.
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