We will present examples showing the influence of hydrogen on fatigue strength in tension-compression tests, rotating bending tests and tensile strength tests of different materials. Particular attention will be paid to the need to redefine values for fracture mechanics, particularly the challenge of identifying a crack in a pipeline and analyzing in which of the three fracture mechanics areas it is located. However, the determination of these values is very complex due to the different framework conditions such as explosion protection, high pressures (up to 1,000 bar), temperature influences (-60°C-+700°C) and the need to analyze the crack.

• Importance of testing under hydrogen
• Hydrogen embrittlement
• Testing scenarios
• Fracture mechanics
• Crack analysis