1. Federal Institute for Materials Research and Testing (BAM), Division 9.1 Service Loading Fatigue and Structural Integrity, Unter den Eichen 87, Berlin D-12205, Germany (Corresponding author), e-mail: wolfram.baer@bam.de, https://orcid.org/0000-0002-9114-6456
2. Federal Institute for Materials Research and Testing (BAM), Division 9.1 Service Loading Fatigue and Structural Integrity, Unter den Eichen 87, Berlin D-12205, Germany