PSI - Issue 2_B

D. Spriestersbach et al. / Procedia Structural Integrity 2 (2016) 1101–1108 Spriestersbach/ Structural Integrity Procedia 00 (2016) 000–000

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runout specimens with an observable VHCF crack prior to failure prove that with this testing procedure it will be possible to observe FGA formation and propagation prior to failure and will help to extend the knowledge on VHCF failure. Such observations are not possible for subsurface crack propagation. As for tests in air no VHCF failure was observed the vacuum conditions seem to be crucial for the late crack initiation. 5. Acknowledgement This research was carried out in the framework of the German Research Foundation (DFG) priority program 1466 - Infinite Life. The authors would like to thank the DFG for the financial support of this work and the Nano Structuring Center Kaiserslautern for the production of the artificial defects. References Billaudeau, T., & Nadot, Y. 2004. Support for an environmental effect on fatigue mechanisms in the long life regime. International Journal of Fatigue , 26, 839-847. Chai, G., Forsman, T., & Gustavsson, F. 2016. 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