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首页> 外文期刊>Journal of thermal stresses >THERMAL DEFORMATIONS IN THIN CIRCULAR RINGS SUBJECTED TO LOCALIZED HEATING
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THERMAL DEFORMATIONS IN THIN CIRCULAR RINGS SUBJECTED TO LOCALIZED HEATING

机译：受局部加热影响的薄圆环中的热变形

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This investigation examined the vertical and horizontal thermoelastic deformations of the outside diameter of a turbojet-engine roller bearing. During a rework operation, thermal loads were imparted to the bearing by the hands of a bearing technician. A worst case analysis was employed by assuming a three-minute dwell time and diametrically symmetric thermal loading. A numerical model was used together with experimentally measured contact temperature to determine the temperature fields throughout the bearing outer ring. Next, diametric displacement solutions were uariationally derived for two mathematical approximations using Hamilton's principle and assuming thin ring behavior. Alternatively, diametric deflections were calculated using a finite element model (FEM) constructed for the bearing outer ring. Then the solutions yielded by the finite element and two analytic techniques were compared to diametric expansion data found experimentally. This analysis yielded vertical expansions in the bearing outer ring's diameter that would be problematic for some bearings during the rework procedure; several recommendations were given to alleviate the problem.
机译：这项研究检查了涡轮喷气发动机滚子轴承外径的垂直和水平热弹性变形。在返修操作期间，轴承技术人员会向轴承施加热负荷。通过假设三分钟的停留时间和完全对称的热负荷来进行最坏情况分析。数值模型与实验测量的接触温度一起用于确定整个轴承外圈的温度场。接下来，采用汉密尔顿原理并假设薄环行为，通过数学推导得出直径位移解。或者，使用为轴承外圈构造的有限元模型（FEM）计算径向挠度。然后将有限元和两种解析技术得出的解与实验中发现的直径扩展数据进行比较。这种分析产生了轴承外圈直径的垂直膨胀，这对于某些轴承在返修过程中是有问题的。提出了一些缓解问题的建议。

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