Material Testing and Design Recommendations for Components exposed to HYdrogen enhanCed fatiguE
The objective of the project is to provide a methodology, based on lab-scale experimental tests under hydrogen gas, in order to assess the service life of a real scale component taking into account fatigue loading under hydrogen. The lifetime assessment will result from combining the hydraulic cycling performance of the component with the appropriate knowledge of the performance of the metallic material in hydrogen under cyclic loading. Dissemination of recommendations for implementations based on international standards is the final goal of the project.
Achievements to date
A review of the existing codes and standards for hydrogen pressure vessel design is running in order to highlight their limits concerning hydrogen fatigue-based design. In the meantime, numerical simulations have been launched to quantify the stresses as well as the hydrogen concentration and localization in pressure vessels for conditions of use, in order to define the experimental conditions (hydrogen pressure...) and global specimen geometry to use for in service representative mechanical lab tests.
The MATHRYCE project will give Europe the opportunity to develop key intellectual properties and scientific knowledge for industrial and scientific actors involved in hydrogen development. It will propose a rationale to ensure fitness for service of metallic subsystems subjected to cyclic fatigue in hydrogen service and recommendations to implement in international standards in the field of hydrogen stationary storage. This should lead to significant gain, in the favor of creating savings for the development of a future hydrogen infrastructure.
The deployment of a large hydrogen infrastructure with societal acceptance relies on the development of appropriate codes and standards to ensure safety. While hydrogen infrastructures are gradually being built all over the world, international standards to properly ensure fitness for service of pressure vessels subject to hydrogen enhanced fatigue do not currently exist. For example, high pressure compressors and pressure buffers in FCV refueling stations experience cyclic loading due to pressure variation. The MATRHYCE project aims to develop and provide an easy to implement vessel design and service life assessment methodology based on lab-scale tests under hydrogen gas. This methodology will be based on selection and further development of the most appropriate, reliable and easy to handle lab-scale tests under hydrogen pressure to quantify the hydrogen induced fatigue of a material. The results shall be transferable, allowing to design a component and to assess its lifetime without full scale tests. At least three types of lab-scale tests will be carried out and carefully analyzed to address the fatigue of pressure vessel steels without and under hydrogen pressure. The proposed rationale will be finally validated by means of fatigue tests under hydrogen pressure on full scale components. The obtained results and conclusions will allow prioritized recommendations to support ongoing or new RCS initiatives at the international level. Indeed, this project will provide the data and methodology necessary to improve European and International standards on high-pressure components exposed to hydrogen-enhanced fatigue. The project aims to support and speed up the building of a safe and harmonized Hydrogen supply network in Europe.