Microscale High-Cycle Fatigue Testing by Dynamic Micropillar Compression Using Continuous Stiffness Measurement

Journal article


Publication Details

Author(s): Merle B, Höppel HW
Journal: Experimental Mechanics
Publisher: SPRINGER
Publication year: 2018
Volume: 58
Journal issue: 3
Pages range: 465-474
ISSN: 0014-4851


Abstract

The continuous stiffness method (CSM) is used for fatigue testing FIB-fabricated micropillars up to the high cycle fatigue (HCF) range on a commercial nanoindentation platform. The frequency of similar to 40 Hz allows reaching several million (10(6)) cycles within hours under constant nominal stress amplitude testing conditions. It is shown that both the evolution of the strain and plastic strain amplitudes can be evaluated from the harmonic measurements provided by the lock-in amplifier. Defining a custom threshold on strain amplitude decrease as failure criterion further enables the determination of S-N curves. The new method was validated by tests on ECAP copper, which is shown to exhibit the same cyclic softening during micropillar testing as observed macroscopically. The calculated plastic strain amplitude is also well in line with literature data. Generally, the new method has a great potential for studying the local cyclic behavior of individual layers and phases of complex systems and would also be of great advantage for studying local fatigue effects at interfaces.


FAU Authors / FAU Editors

Höppel, Heinz Werner PD Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Merle, Benoit PD Dr. habil.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)


Additional Organisation
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


How to cite

APA:
Merle, B., & Höppel, H.W. (2018). Microscale High-Cycle Fatigue Testing by Dynamic Micropillar Compression Using Continuous Stiffness Measurement. Experimental Mechanics, 58(3), 465-474. https://dx.doi.org/10.1007/s11340-017-0362-3

MLA:
Merle, Benoit, and Heinz Werner Höppel. "Microscale High-Cycle Fatigue Testing by Dynamic Micropillar Compression Using Continuous Stiffness Measurement." Experimental Mechanics 58.3 (2018): 465-474.

BibTeX: 

Last updated on 2019-28-05 at 13:28