Investigation of Materials for Long Life, High Reliability Flexure Bearing Springs for Stirling Cryocooler Applications
Investigation of Materials for Long Life, High Reliability Flexure Bearing Springs for Stirling Cryocooler Applications
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斯特林低温冷却器应用中长寿命、高可靠性挠曲轴承弹簧材料的研究
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发表时间：
2012
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通讯作者：
C. Simcock
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作者：
C. Simcock
安装弹性轴承碟形弹簧，以支撑直线斯特林制冷机内的压缩机马达总成和置换器。这样的弹簧部件是用不锈钢光刻的。由于弹簧疲劳失效非常严重，因此需要进行耗时的批量试验。已经开展了研究，以确定部件的可接受安全系数，确定材料的机械性能，并提高对故障及其原因的理解。在安全限度内运行，并检查不可容忍的缺陷，消除了延长批次测试的需要。有限元分析(FEA)模型已用于了解弹簧应力与位移行程的关系。为了验证有限元模型的结果，在承受典型载荷的部件上安装了应变片。结果的良好相关性支持使用有限元模型对弯曲支承弹簧进行优化设计。使用针对最大冲程进行优化的组件的组件需要卓越的质量控制和批量测试。其他设计，在其性能范围内操作更舒适，可以在不进行严格的质量和批量测试的情况下进行构建。
Flexure bearing disc springs are installed to support the compressor motor assembly and the displacer within the linear Stirling cryocooler. Such Spring components are photo-etched in stainless steel. As the spring fatigue failure is critical; time consuming batch tests are performed. Research has been carried out to identify an acceptable factor of safety for the component, establish material mechanical properties and improve the understanding of failure and its causes. Operating within a safe limit and inspecting for intolerable defects removes the need for extended batch testing. Finite Element Analysis (FEA) modeling has been used to understand spring stress versus displacement stroke. To validate FEA model results, strain gauges were fitted to the components subjected to the representative loading. A good correlation of the results supports the use of FEA modelling for design optimization of flexure bearing springs. Assemblies using the components optimized for the maximum stroke require superior quality control and batch testing. Other designs, operating more comfortably within their performance envelope, may proceed through build without rigorous quality and batch tests.