Investigation on material degradation during tip-rub 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（通过减少燃料消耗）是重要的。在套管中包含牺牲材料提供了一种“软”材料，如果发生入侵。这些事件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的材料中的磨损和微观结构变化形式的退化，并且因此导致承受工作载荷和温度的能力降低，或者任何未来的侵入事件。拟议的工作将提供基本的理解，通过实验和建模的方法，入侵事件的影响的微观结构和机械性能的叶片尖端和衬里材料，并将有助于评估剩余寿命和未来的行为的影响，从而改进设计和入侵事件的寿命规则。

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.