Session: MF-02-01 Materials for hydrogen service I (Joint with C&S)

Paper Number: 61138

Start Time: Tuesday, July 13, 2021, 09:00 AM

61138 - Comparison of Tensile Test Results in High Pressure Gaseous Hydrogen Using Conventional and Tubular Specimens 

Developing solid engineering standards for the hydrogen ecnomy typically require many years of research, development and testing. Materials testing in particular can be a very resource consuming effort. Materials tests in high pressure hydrogen are typically performed in high pressure autoclaves using standard specimen designs. The advantage is that the material properties obtained from such specimens are well accepted and can be used for further processing without modification. The disadvantage is the high cost for such tests resulting from the high technological efforts and strict safety protocols. Due to the high volume of the autoclave, it is challenging to maintain constant test conditions, especially at high pressures and non-ambient temperatures. Also due to the high volume of the autoclave, strict safety protocols must be enforced because an explosive oxygen-hydrogen gas mixture may develop upon a hydrogen gas leak. The high volume of the hydrogen can be greatly reduced by using tubular specimen and applying the hydrogen pressure to that inner hole. Such tests can be performed in a standard laboratory environment with minimum safety protocols because the very little volume of the hydrogen provides little risk. In addition, performing tests at various pressure-temperature combinations are relatively easy to realize. This paper directly compares the tensile properties of various steels measured in high pressure gaseous hydrogen using conmventional and tubular speciemens. Differences and commonalities are discussed.

Presenting Author: Thorsten Michler Fraunhofer IWM

Authors:

Thorsten Michler Fraunhofer IWM
Ken Wackermann Fraunhofer IWM
Fabien Ebling Fraunhofer IWM
Heiner Oesterlin Fraunhofer IWM