Methods for Accelerating Dynamic Durability Tests

Vibrating components are highly susceptible to fatigue failure. Fatigue occurs through long term exposure to time varying loads which although modest in amplitude give rise to microscopic cracks that steadily propagate to failure. Most components must fulfil some form of durability certification test prior to production. Tests are conducted on real prototype components or use a CAE based simulation of the component. It is seldom possible to use real service loads so engineers require a reduced specification that is still representative of the operational environment. For many years this was addressed through experience; however, it has often led to unnecessary over-design or operational failures. In this paper we pursue a more scientific route and review the topic of Mission Profiling and Test Synthesis. A ‘route map’ is presented to guide the reader towards the optimal test solution.