Investigation of Variable Amplitude Loading and Stress Ratio in the Very High Cycle Fatigue Regime Using Micro-notched Specimens. (2015)

• Record Type: Journal Article
• Authors: Müller, Thomas; Sander, Manuela
• Is Part Of: Procedia engineering. Volume 101(2015)
• Page Start: 322
• Page End: 329
• Publication Date: 2015
• Subjects: very high cycle fatigue -- reconstructed load spectrum -- micro-notches -- linear damage accumulation; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2015.02.039
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: In order to study the effect of small defects in the regime of very high cycle fatigue, 20 μm deep micro-notches are introduced into the specimens by laser sublimation. Tests are performed using an ultrasonic fatigue testing system. For the variable amplitude loading tests a reconstructed load sequence on the basis of a standardized load time history called FELIX is used and transformed to the stress ratios of -1 and 0. The experimental results are compared to previous investigations with smooth specimens. Moreover, calculated Gassner lines using the linear damage accumulation are compared to the experimental results.