A Novel Approach for Monitoring Plastic Flow Localization during In-Situ Sem Testing of Small-Scale Samples
- 181 Downloads
A novel method is proposed for monitoring the plastic flow localization during in-situ scanning electron microscopy (SEM) testing of small-scale AISI 316 L stainless steel. Stress-strain behavior of the material was obtained using a hybrid numerical-experimental (HNE) approach. By repeatedly illustrating each pair of sequentially taken SEM surface images throughout the deformation history in alternating order in form of a video, location of the material points which are not moving during the deformation can be detected. At the initial stages of deformation these points are located on the geometrical symmetry line of the test sample, however; when uniform straining limit of the material is reached, the locations of the stationary material points reveal the plastic localization regions. The current results clearly prove the feasibility of the presented method in monitoring primary plastic localization events through in-situ SEM tensile testing.
KeywordsPlastic flow localization In-situ SEM Microstructure Ductile fracture Small scale testing
Financial supports by Koç University Graduate School of Sciences and Engineering; Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, Freiberg, Germany; and the CRC 799 subproject B5 are gratefully acknowledged. AW acknowledges Dr. Jiri Man of the Institute of Physics of Materials Brno (IMP, Czech Academy of Science Brno) for providing the 316 L steel.
- 1.Rogers HC (1960) The tensile fracture of ductile metals. Trans Metall Soc AIME 218(3):498–506Google Scholar
- 6.Rice, J. R. (1976). The localization of plastic deformation (pp. 207–220). Division of Engineering, Brown UniversityGoogle Scholar
- 7.Tvergaard V (1982) On localization in ductile materials containing spherical voids. Int J Fract 18(4):237–252Google Scholar
- 22.Swanson Analysis Systems Inc. ANSYS, Revision 15Google Scholar
- 23.Swanson Analysis Systems Inc, 2007. ANSYS, Release 15. Contact Technology Guide. Swanson Analysis Systems Inc (Chapter 3). Surface-to-Surface ContactGoogle Scholar
- 24.Online: http://www.physlink.com/Reference/FrictionCoefficients.cfm, web site of Physlink.com containing coefficients of static and kinetic friction