Regensburg 2007 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 20: Poster session

MM 20.14: Poster

Dienstag, 27. März 2007, 14:45–18:00, Poster C

Miniaturisation of the shear compression specimen — •Markus Ames, Jürgen Markmann, and Rainer Birringer — Universität des Saarlandes, Saarbrücken, Deutschland

The shear compression specimen has been developed for large strain testing of materials. It consists of a short cylinder or cuboid with two slots oriented at 45^∘ relatively to the longitudinal axis (gauge section). As a result of this geometry, uniaxial compression leads to a predominant shear deformation localized across/along the gauge section. The obtained data has been evaluated by comparing the experimental data with finite element simulations of the deformation process, using material properties like young modulus and yield stress as input parameters.

The purpose of the present study was to explore the potential for miniaturising this specimen geometry in order to become applicable for mechanical testing of small-sized nanostructured materials. Therefore, the geometry of the conventional shear compression specimen (a cylinder of 20mm height and 12.65mm in diameter) has been stepwise affinely shrunk to cuboids of 7 x 3.6 x 0.5mm in size. We used the spark erosion technique to prepare specimen of OFHC copper, and we will discuss, based on yield stress and modulus, under which conditions the mechanical behaviour of such miniaturised specimen appears shape and size invariant.