Investigation on material degradation during tip-rub events

尖端摩擦事件期间材料降解的研究

• 批准号: 2271231
• 金额: --
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2271231
• 关键词: Investigation; material; degradation; during; tip

Minimising the clearance between the blade tip and casing is important in modern aeroengines to improve efficiency (by reducing fuel consumption). The inclusion of sacrificial materials in the casing provides a 'soft' material should an incursion occur. Such events lead to heat generation and a complex multiaxial stress state (combinations of centrifugal loads and frictional loading), which can result in degradation in the form of wear and microstructural changes in the material of the blade and liner and, therefore, a reduced capability to endure service loads and temperatures, or any future incursion events. The proposed work will provide fundamental understanding through both experimental and modelling approaches, of the effect of incursion events on the microstructural and mechanical properties of the blade tip and liner materials and will assist in assessing the effects on the remaining life and future behaviour, leading to improved design and lifing rules for incursion events.

在现代航空发动机中，最小化叶尖和壳体之间的间隙对于提高效率（通过降低燃油消耗）非常重要。如果发生入侵，外壳中包含的牺牲材料可提供“软”材料。此类事件会导致发热和复杂的多轴应力状态（离心载荷和摩擦载荷的组合），这可能导致叶片和衬套材料以磨损和微观结构变化的形式退化，从而降低承受使用载荷和温度或任何未来入侵事件的能力。拟议的工作将通过实验和建模方法提供对入侵事件对叶尖和衬里材料的微观结构和机械性能的影响的基本了解，并将有助于评估对剩余寿命和未来行为的影响，从而改进入侵事件的设计和寿命规则。