Life and DUrability PredictioN of Aero-engine Composites-LUNA

Purpose and goal

This project addresses the need to develop a method that predicts how the composite´s mechanical properties change over time and with thermo-mechanical loading. The project develops a calculation methodology that describes the occurrence and growth of damage in composites exposed to quasi-static or cyclic multiaxial loads during thermal and mechanical fatigue. The methodology is part of an experimental modeling methodology that is fundamentally based on an understanding of relevant physical damage mechanisms on a micro- and meso-scale.

Expected results and effects

The project has developed a unique tool in the form of a material model for the life prediction of composite engine components. In particular, a calculation methodology that describes the initiation and growth of damage in composites exposed to quasi-static and cyclic multiaxial loads in combination with hygrothermal cycling was developed, based on the understanding of the relevant physical damage mechanisms. Significant time and cost savings in future testing and qualification programs are expected when the proposed methodology is coupled with mechanism-based models.

Planned approach and implementation

The project has been coordinated by GKN and largely carried out practically by a doctoral student at LTU and RISE. A total of 5 work packages have been carried out during the course of the project. These include project management, literature study, development of the model, manufacturing of coupons, experimental validation and dissemination of the project. All the partners in the project have a well-established collaboration that has contributed to the project success.