Tuesday, 11 February 2025

Time:
09:00 - 10:00 AM
Place: This Tutorial is a hybrid event. You can join the event on-site and online.
Rhein-Sieg-Forum, Bachstraße 1, 53721 Siegburg
Moderator:
Prof. Dr. Peter Felfer

At high pressures, hydrogen can penetrate metals and cause changes to mechanical properties, much like hydrogen stemming from electrochemical processes. This has both practical and scientific relevance. Practical relevance, since many hydrogen energy systems deal with compressed hydrogen at pressures up to 1000 bar (100 MPa) at various temperatures, and scientific relevance since high pressure hydrogen creates a controlled and reproducible thermodynamic state in the material to be investigated, making research on fundamental effects of hydrogen in the microstructure much more controlled. It also leaves the specimen without corrosion and a clean surface, e.g. for fatigue and micromechanical experiments.

In this workshop, we will address the basics of conducting material scientific experiments with high pressure hydrogen. This includes the two main aspects physico-chemical fundamentals and their experimental realization, observing the relevant safety aspects. First, this will include hydrogen’s real gas laws and Sievert’s law and their implications for experimental design. We will then cover the basics of safety requirements for the work with compressed hydrogen, including an introduction into the ATEX workplace (EU directive 2014/34/EU) and equipment (EU dirctive 1999/92/EC) regulations. This will be complemented by an introduction into the basics of the high-pressure equipment such as valves, pressure gauges and high pressure tubing needed to set up experiments with high-pressure hydrogen. Finally, we will cover specimen handling and storage for mechanical testing and microscopy, with examples from slow strain rate tensile testing and atom probe tomography.