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strain-homogeneity
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Evaluation of sample scale effect on geomechanical tests
, Article Petroleum Research ; Volume 7, Issue 4 , 2022 , Pages 527-535 ; 20962495 (ISSN) ; Shad, S ; Zivar, D ; Sharif University of Technology
KeAi Publishing Communications Ltd
2022
Abstract
The size of the rock specimen affects the stress concentrates in the vicinity of the top/bottom of the rock specimen during the evaluation of the geomechanical parameters in the laboratory, which causes unreliable results. However, the appropriate size for geomechanical evaluation is not well understood yet because of limitations in the sampling and analysis. In this study, a series of numerical simulations using a finite element package was conducted to investigate the effect of sample aspect ratio, fluid saturation, and porosity, on the mechanical behavior of the rock under elastic and poroelastic conditions. In addition, two concepts, stress/strain homogeneity index (SHI) and...
Deformation behavior of 6061 aluminum alloy through tube channel pressing: Severe plastic deformation
, Article Journal of Materials Engineering and Performance ; Volume 21, Issue 10 , 2012 , Pages 2099-2105 ; 10599495 (ISSN) ; Kazeminezhad, M ; Sharif University of Technology
Springer
2012
Abstract
The deformation behavior of solid solution-treated AA6061 tubes in a novel severe plastic deformation process named Tube Channel Pressing has been assessed. In order to do so, an analysis based on the finite element method and dislocation density model is utilized, and microhardness measurement is carried out to verify the trends of analysis results. By comparing FEM results with experimental data, the optimized geometrical parameters controlling the deformation behavior of the tube in tube channel pressing are determined to obtain the best strain homogeneity and minimum dimensional changes in tube
Deformation characteristics evaluation of modified equal channel angular pressing processes
, Article Materials Transactions ; Volume 51, Issue 1 , 2010 , Pages 46-50 ; 13459678 (ISSN) ; Nagasekhar, A. V ; Yoo, J. H ; El Aal, M. I. A ; Vaseghi, M ; Kim, H. S ; Sharif University of Technology
2010
Abstract
In current studies, equal channel angular pressing process (ECAP) and modified ECAP processes are simulated under ideal conditions to compare the deformation characteristics. The deformation behaviour is more complicated and the strain induced during the processes is highly non-uniform in the modified ECAP processes except in the equal channel multi-angular pressing (ECMAP) process with Route C. The strain homogeneity is more of a possibility with ECAP and ECMAP with Route C processes. The deformation stress state is widely distributed in nature in modified ECAP processes than in conventional ECAP. In addition, the load requirements are also higher in modified ECAP processes with that of the...