Regensburg 2007 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 20: Poster session
MM 20.16: Poster
Tuesday, March 27, 2007, 14:45–18:00, Poster C
Analytical and numerical evaluation of the critical tensile stress for failure event in single-crystal sapphire detected by the combined application of normal and lateral forces — •Maksim Karniychuk1, Vladimir Kolchuzhin2, and Frank Richter1 — 1Technische Universität Chemnitz, Institut für Physik, 09107 Chemnitz — 2Technische Universität Chemnitz, Fakultät für Elektrotechnik und Informationstechnik, 09107 Chemnitz
The new possibilities for mechanical characterization of bulk and coated materials by the combined application of normal (UMIS 2000, CSIRO) and lateral (LFU, ASMEC) forces were recently developed [1,2]. Among others, the possibility for experimental detection of crack formation was offered. As an example, the crack formation was detected in single-crystal sapphire from the shape of the lateral force-displacement curves at a given normal force. Thus, the value of critical tensile stress for crack formation in material can be evaluated by both analytical and numerical approaches at the known critical normal and lateral forces.
The presented work reports results of comparison of critical tensile stress evaluations performed by both mentioned approaches. The analytical approach uses the Hanson model for bulk materials realized by the software Elastica (ASMEC). Finite Element Method is used for numerical evaluation by means of the commercial software ANSYS.
[1] V. Linss, T. Chudoba, M. Karniychuk, F. Richter, Thin Solid Films 494 (2006) 179
[2] M. Karniychuk, Ph.D. thesis, TU Chemnitz, 2006