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ISRN Materials Science
Volume 2013 (2013), Article ID 536069, 8 pages
http://dx.doi.org/10.1155/2013/536069
Research Article

Process of Identifying Stress Fields from Strain Fields in the Specimen with a Hole

1Department of Material Engineering, Faculty of Metallurgy and Materials Engineering, VŠB-Technical University of Ostrava, 17. Listopadu 15, Poruba, 708 33 Ostrava, Czech Republic
2Department of Non-Ferrous Metals, Refining and Recycling, Faculty of Metallurgy and Materials Engineering, VŠB-Technical University of Ostrava, 17. Listopadu 15/2172, Poruba, 708 33 Ostrava, Czech Republic

Received 16 July 2013; Accepted 16 September 2013

Academic Editors: Y. C. Lu and J. M. Prado

Copyright © 2013 Michaela Štamborská et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The paper is focused on the process of identifying stress fields from strain fields in the specimen with a hole. The experiment was realized on the specimen with a hole made from anisotropic material. The main attention is paid to the analysis of deformation in the areas of stress (near the hole). That geometry generates a heterogeneous strain field which has been measured during the test using a digital image correlation system. The advantage of using heterogeneous strain fields in the identification procedure is that a complex state of stress-strain can be analyzed at the same time. On the other hand the stress field cannot be directly computed from the test and a suitable identification procedure has to be developed. Here, the virtual fields method (VFM) adapted for plastic strain has been used to identify the hardening behaviour and the anisotropy of the material. The values obtained by the VFM have been compared with the results coming from a standard identification made with uniaxial tensile tests.