Electron microscope observation of shear cracks in stainless steel single crystals
- 1 January 1980
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 41 (1) , 81-89
- https://doi.org/10.1080/01418618008241832
Abstract
Electron microscope studies have been made of the propagation of shear cracks and the distribution of dislocations in the plastic zone during in situ tensile deformation of stainless steel single crystals. In thin-foil specimens under plane stress conditions, the plastic zone was coplanar with the crack and it represented the slip system of maximum resolved shear stress. The dislocations in the plastic zone were in the form of an inverse pile-up. Contrast analysis has shown that these dislocations were of pure screw type which were extended into two Shockley partials. The crack opening displacement was measured directly by counting the number of dislocations in the plastic zone and it was found to be approximately equal to the foil thickness. These observations are in good agreement with the model of shear cracks proposed by Bilby, Cottrell and Swinden (1963). The size of the plastic zone was much shorter than the value predicted by the theory and possible reasons for this discrepancy are discussed.Keywords
This publication has 6 references indexed in Scilit:
- Yielding of steel sheets containing slitsPublished by Elsevier ,2002
- A Bending Holder for “In-Situ” Deformation Of Electron Microscope SpecimensProceedings, annual meeting, Electron Microscopy Society of America, 1976
- Local yielding and extension of a crack under plane stressActa Metallurgica, 1965
- The Bakerian Lecture, 1963. FractureProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1963
- The spread of plastic yield from a notchProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1963
- CXL. Dislocations in thin platesJournal of Computers in Education, 1951