The hyperbolic sine relation and dip test data in constant strain rate compression experiments

0353874 - ÚFM 2011 RIV GB eng J - Journal Article
Kruml, Tomáš - Coddet, O. - Martin, J. L.
The hyperbolic sine relation and dip test data in constant strain rate compression experiments.
Journal of Physics: Conference Series. Roč. 240, - (2010), 012028. ISSN 1742-6588. E-ISSN 1742-6596.
[ICSMA-15 (15th International Conference on the Strength of Materials). Dresden, 16.08.2009-21.08.2009]
Institutional research plan: CEZ:AV0Z20410507
Keywords : dip test * effective stress * compression
Subject RIV: JJ - Other Materials

Single crystals of Ni3Al, intrinsic Ge, Cu, Cu with 5at%Al and 7.5at%Al are submitted to constant strain rate compression tests and stress reduction experiments. Curves of the initial creep rate as a function of the amount of stress reduction are analysed in terms of a hyperbolic sine relation based on the thermal activation of the dislocation velocity. It is shown that this relation satisfactorily fits the curves of the two first crystals. However, this is not observed for the three last ones. Reasons for this behaviour are proposed as well as a method for the effective stress evaluation.
Permanent Link: http://hdl.handle.net/11104/0192998