Mechanical Testing of Solid–Solid Interfaces at the Microscale

In order to determine the influence of internal interfaces on the material’s global mechanical behavior, the strength of single interfaces is of great interest. The experimental framework presented here enables quantitative measurements of the initiation and propagation of interfacial cracks on the...

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Bibliographic Details
Published in:Experimental mechanics 2012-07, Vol.52 (6), p.649-658
Main Authors: Kupka, D., Lilleodden, E. T.
Format: Article
Language:English
Subjects:
Biomedical Engineering and Bioengineering
Characterization and Evaluation of Materials
Control
Cross-disciplinary physics: materials science
rheology
Dynamical Systems
Engineering
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Lasers
Materials science
Materials testing
Mechanical instruments, equipment and techniques
Micromechanical devices and systems
Optical Devices
Optics
Photonics
Physics
Solid Mechanics
Structural and continuum mechanics
Vibration
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Summary:In order to determine the influence of internal interfaces on the material’s global mechanical behavior, the strength of single interfaces is of great interest. The experimental framework presented here enables quantitative measurements of the initiation and propagation of interfacial cracks on the microscale. Cantilever beams are fabricated by focused ion beam milling out of a bulk sample, with an interface of interest placed close to the fixed end of the cantilever. Additionally, a U-notch is fabricated at the location of the interface to serve as a stress concentrator for the initiation of the crack. The cantilevers are then mechanically deflected using a nanoindentation system for high resolution load-displacement measurements. In order to determine the onset and propagation of damage, the stiffness of the cantilevers is recorded by partial unloads during the test as well as by making use of a continuous stiffness technique. A finite element model is used to normalize the load and stiffness in order to establish the framework for comparisons between different interfaces.
ISSN:0014-4851
1741-2765
DOI:10.1007/s11340-011-9530-z