The novel field of miniaturized mechanical testing down to the nanometer length scale has evolved significantly in the last few years. The origin of most methods is based on nanoindentation testing - which is also called instrumented indentation testing - a well established technique in materials research although new developments still improve and extend the application field largely. Novel nano- and micromechanical methods include compression, tension and bending tests, thin film testing methods (e.g. bulge testing, thermal straining), different in situ testing techniques as for example micro-bending experiments combined with X-ray diffraction methods as well as fatigue and fracture experiments performed on a very local scale or on small specimens to determine mechanical material properties. The samples are prepared by focussed ion beam technique, lithography, etching of thin film and composite structures or growth of micro/nano-objects (whiskers, rods, spheres,).
Since always very small volumes are tested size effects are very important. Modelling of the mechanical behavior is of special importance to gain an improved understanding of the measurements and underlying deformation mechanisms in the various test methods. For example, discrete dislocation dynamics and molecular dynamics provide meaningful and quantitative insights into the deformation processes around nanoindentations and small scale samples
Applications of these nano- and micromechanical testing methods become more and more important in all fields of materials research like metals, ceramics, glasses, polymers, coatings, composites, and biomaterials and will improve our understanding of the complex mechanical behaviour. Next to the hardness which is classically measured in an indentation test nanoindentations and other methods allow way more properties to be measured. For example the visco-elastic behaviour or time dependent properties, phase transformations, fracture phenome
|Contact: Kevin Korpics|
Engineering Conferences International