Methodology to design composite structures resistant to intra- and interlaminar damage

Purpose and goal

A physically based model and experimental methodology to simulate crack evolution in NCF composites under static and cyclic loadings has been developed, reaching the main goal of the project. The new methodology based on Weibull strength distribution and adapted for cyclic loading conditions has been proposed and validated within the project. The model has been summarized and implemented in software codes for use as a tool for the design of fatigue loaded composite structures.

Expected results and effects

The main result of the project is the physically based model and methodology for predicting damage initiation and evolution in NCF composites. The model has been summarized and implemented in codes for use as a tool for the design of fatigue loaded composite structures. The methodology will allow for safe and efficient prediction of fatigue performance of composite structures. The fundamental research results from the present project are also expected to improve the general understanding of the fatigue behavior of composites in other relevant applications.

Planned approach and implementation

The project was carried out in four work packages: Project planning and meetings, Quasi-static characterization, Cyclic (fatigue) characterization and Method development for fatigue behavior prediction. The work packages were carried out basically according to the initial plan. No significant delays or deviations from the plan were necessary. A few deliverables were merged into larger reports for achieving a more comprehensive description of the performed work.