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 thermomechanical loading. In the project, a calculation methodology is developed that describes the occurrence and growth of damage in composites that are 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 at the micro- and meso-scale. Expected results and effects:

The project has developed a unique tool in the form of a material model for service life forecasts for composite components. In particular, a computational methodology describing the initiation and growth of damage in composites subjected to quasi-static and cyclic multiaxial loading combined with hygrothermal cycling was developed, based on the understanding of the relevant physical damage mechanisms.

Significant time and cost savings in future test and qualification programs are expected when the proposed method is combined with mechanism-based models. Approach and implementation:

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