A Predictive Approach to Modelling Frictional Joint Performance (PAMFJP)

拟议的研究旨在解决固有的问题，预测摩擦接头的行为。这种接头是各种工程产品的重要特征。接头行为可以是有益的（例如通过引入摩擦阻尼和控制振动幅度）或有害的（例如通过引起疲劳失效的加速磨损）。虽然模型现在存在的一些这些现象，它是目前难以预测的摩擦行为的接口，而不是在代表性的条件下进行实验测量。事实上，与摩擦接头的行为相关的不确定性是振动衰减和由此产生的组件lifes.The拟议的工作解决了上述困难的可靠预测的剩余障碍之一，通过两个领导小组在传统上独立的振动和结构完整性领域进行的综合实验和建模计划。这项工作将从一个共同的角度进行，并将产生一个对两族都有价值的整体办法。首先，将使用两种标准几何形状和两种材料对测量接头性能。然后，将采取测量，以确定表面形貌，材料性能，界面行为在微观结构和粗糙度尺度。这些测量结果将为接触建模提供输入，最初是在单个粗糙体的尺度上，但后来使用统计方法进行推广，以提供整体接触行为的预测。这些预测将基于最近在微观和纳米尺度上对界面行为的理解的发展。最后，将进行验证实验。将仔细选择这些参数，以在与初始表征实验显著不同的情况下验证模型。拟议工作的总体成果将是增强对工程组件（如燃气涡轮机发动机）中摩擦接头的理解和预测建模方法。其结果将是增加联合（因此，整个系统）的性能的信心，并在表征实验的需要减少。

The proposed research aims to address the problems inherent in predicting the behaviour of frictional joints. Such joints are an important feature of a wide range of engineering products. Joint behaviour can be beneficial (e.g. by introducing frictional damping and controlling vibration amplitude) or detrimental (e.g. by inducing accelerated wear of fatigue failure). Whilst models now exist for some of these phenomena, it is at present difficult to predict the frictional behaviour of an interface in advance without making experimental measurements under representative conditions. Indeed, uncertainties associated with the behaviour of frictional joints are one of the remaining obstacles to reliable prediction of vibration amplitides and resulting component life.The proposed work addresses the difficulteis outlined above through a combined experimental and modelling programme undertaken by two leading groups in the traditionally separate areas of vibration and structural integrity. The work will be undertaken from a common standpoint and will result in a holistic approach which is valuable to both communities. Intitially, measurements will be made of joint performance using two standard geometries and two material pairs. Measurements will then be taken to characterise the surface topography, material properties, and interface behaviour at microstructural and asperity scales. These measurements will provide input for modelling of the contact, initially at the scale of a single asperity, but later generalised using statistical methods to provide predictions of overall contact behaviour. These predictions will be based on recent developments in the understanding of interface behaviour at the micro- and nano- scales.Finally, validation experiments will be carried out. These will be carefully chosen to give validation of the model in circumstances which differ significantly from the initial characterisation experiments. The overall output of the proposed work will be an enhanced understanding and predictive modelling approach for frictional joints in engineering assemblies such as gas turbine engines. The result will be increased confidence in joint (and therefore overall system) performance, and a reduction in the need for characterisation experiments.