Abstract
This paper reviews common laboratory toughness test methods to characterize hydrogen embrittlement effects, presents representative results, and comments on limitations of the methods. Fracture resistance properties appear to be the vital property for the safety of higher materials utilization in hydrogen pipelines (i.e., high design stresses per ASME B31.12 Option B); however, further developments of the existing test methods and standards are needed. This paper can serve as a discussion piece at the symposium of Advanced Manufacturing and Materials to further develop materials qualification tests for the design of pipelines transporting pure hydrogen and hydrogen blends.