Contact evolution based fretting fatigue prediction

复杂联轴器和连接件的失效设计是关键航空发动机部件优化的关键主题，这对英国航空发动机工业的持续竞争力构成了重大挑战。与接近这些部件的紧密接触区域相关的困难为计算建模和预测技术提供了机会。该项目将通过整合多种不同的技术，在建模技术应用于工程接触连接设计方面实现飞跃。将纳入拟开发的工具的关键技术是：（i）由于微动磨损作用的材料去除的基于有限元的建模，（ii）用于表征多轴应力状态的渐近解，用于在尖锐接触边缘和陡峭接触应力梯度处的裂纹预测，（iii）使用多轴代表性测试技术获得循环相关摩擦接触数据（iv）组合磨损-疲劳预测技术，以提供一个微动疲劳损伤参数，捕捉滑移幅度的影响。该工具将被应用到现实的三维航空发动机验证组件和验证现有的测试数据，从以前的EPSRC资助的工作。

The design of complex couplings and connections against failure is a key topic for the optimisation of key aeroengine components, which represents a vital challenge for the sustained competitiveness of the British aeroengine industry. The difficulties associated with gaining access to the intimate contacting regions of such components provides an opportunity for computational modelling and predictive techniques. This project will bring about a quantum leap in the application of modelling techniques to the design of engineering contact connections through the consolidation of a number of different techniques. The key techniques that will be incorporated in the tool to be developed are: (i) finite element based modelling of material removal due to fretting wear action, (ii) asymptotic solutions for characterising the multiaxial stress states for cracking prediction at sharp contact edges and steep contact stress gradients, (iii) the use of multiaxial representative testing techniques for obtaining cycle-dependent frictional contact data(iv) a combined wear-fatigue prediction technique to provide a fretting fatigue damage parameter that captures the effects of slip amplitude.The tool will be applied to realistic three-dimensional aeroengine demonstrator components and validated against existing test data from previous EPSRC-funded work.