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

Merle B, Höppel HW (2018)

Publication Status: Published

Publication Type: Journal article

Publication year: 2018

Journal

Experimental Mechanics Society for Experimental Mechanics (SEM)

Publisher: SPRINGER

Book Volume: 58

Pages Range: 465-474

Journal Issue: 3

DOI: 10.1007/s11340-017-0362-3

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.

Authors with CRIS profile

Benoit Merle Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Heinz Werner Höppel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Layered Lightweight Composites and Graded Materials (EXC315 EAM (E3)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2012 - Oct. 31, 2017

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.

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