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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Creep-behavior-based material selection for a clamping spring of ceramic-matrix composite inner-shroud in utility and industrial gas-turbine engines
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Creep-behavior-based material selection for a clamping spring of ceramic-matrix composite inner-shroud in utility and industrial gas-turbine engines

机译：基于蠕变特性的公用和工业燃气轮机发动机陶瓷基复合材料内罩夹紧弹簧的材料选择

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This paper addresses the problem of materials selection for springs used to clamp an inner shroud segment to the outer shroud block in utility and industrial gas turbine engines. Clamping is achieved through the application of an initial compressive load to the spring. However, since the spring is subjected to high temperature and oxidizing conditions, it experiences creep and surface oxidation. Both of these processes result in the loss of the compressive load within the spring with time. A material selection procedure is developed, which identifies optimum materials (design variables), with respect to the minimum loss in the clamping-spring load (objective function) for a given set of geometrical constraints (i.e. maximum size of the spring is constrained by the outer-shroud cavity which houses the spring) and functional constraints (force retention should persist over the expected life of the inner-shroud segment). Two material selection procedures are devised: (a) one, fairly rigorous and computationally intensive, based on the use of a finite element analysis; and (b) the other, less rigorous but computationally less expensive, based on the use of a simplified analyticalumerical procedure. In the absence of oxidation, the two approaches yielded different, but mutually consistent, results with identical ranking of the clamping-force candidate materials. The inclusion of the oxidation effects showed that oxidation-induced loss in the spring material increases the extent of clamping-force relaxation and may affect the ranking of the candidate materials.
机译：本文解决了在公用燃气轮机和工业燃气轮机发动机中用于将内罩段夹在外罩块上的弹簧的材料选择问题。通过向弹簧施加初始压缩负载来实现夹紧。但是，由于弹簧经受高温和氧化条件，因此会发生蠕变和表面氧化。这两个过程都会导致弹簧内的压缩负载随时间损失。针对给定的几何约束（即弹簧的最大尺寸受弹簧的最大约束），开发了一种材料选择程序，该程序针对夹紧弹簧载荷的最小损失（目标函数）确定最佳材料（设计变量）。外罩腔容纳弹簧）和功能约束（力保持力应在内罩段的预期寿命内持续）。设计了两种材料选择程序：（a）一种基于有限元分析的相当严格且计算量大的程序； （b）基于简化的分析/数值程序的使用，另一种较不严格，但在计算上却较便宜。在不存在氧化的情况下，两种方法在夹持力候选材料的等级相同时产生不同但相互一致的结果。包含氧化作用表明，弹簧材料中由氧化引起的损失会增加夹持力的松弛程度，并可能影响候选材料的等级。

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