ORCID Profile
0000-0002-5205-2086
Current Organisation
Deakin University
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Publisher: Elsevier BV
Date: 09-2013
Publisher: Elsevier BV
Date: 11-2015
Publisher: Springer Science and Business Media LLC
Date: 11-2009
Publisher: AGHU University of Science and Technology Press
Date: 2021
Publisher: Elsevier BV
Date: 04-2011
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 11-1998
Publisher: Elsevier BV
Date: 1996
Publisher: Springer Science and Business Media LLC
Date: 27-11-2013
Publisher: Elsevier BV
Date: 08-2013
Publisher: Elsevier BV
Date: 11-2015
Publisher: Springer Science and Business Media LLC
Date: 11-2009
Publisher: IOP Publishing
Date: 12-11-2014
Publisher: Wiley
Date: 20-11-2014
Publisher: Elsevier BV
Date: 12-2012
Publisher: Springer Science and Business Media LLC
Date: 03-12-2018
Publisher: SAGE Publications
Date: 11-2021
DOI: 10.1177/16878140211061026
Abstract: Materials engineering and science rely heavily on the indirect measurement of plastic stress and strain by post-processing of mechanical test data, including tension, torsion, and compression test. There is no consensus among researchers regarding the best test or the post-processing theory nor do adequate standards exist on the characterization methods. The tests are typically performed as customized tests, discrepancies exist in the flow curves obtained by different methods and the chosen mechanical test. More critically, the curves are dominantly treated (perceived) as a set of measured data rather than calculated values. The plasticity-based calculated flow curves and their gradients are, in turn, the basis for several second-tier indirect measurements, such as stacking fault energy and recrystallization. Such measurements are quite prone to errors due to oversimplified post-processing of the tests’ data and can only be experimentally verified in a qualitative or in an average fashion. Therefore, their findings are highly restricted by the limitations of each test, data type and post-processing method, and should be used carefully. This review examines some of the most commonly used data conversion methods and some recent developments in the field followed by recommendations. It will highlight the need to develop test rigs that can provide new data types and to provide advanced post-processing techniques for the indirect measurement.
Publisher: IOP Publishing
Date: 10-10-2012
Publisher: SAGE Publications
Date: 03-2007
Abstract: Deployable booms play an important role in holding instruments away from the satellites, and the more rigid they are, the greater the attitude stability of the satellite and instruments will be. Several design concepts for the deployable booms have been proposed and implemented, among which the lenticular boom is one of the most rigid ones. In the present paper, a method for estimation of the design parameters of lenticular booms is proposed. The design parameters investigated in this paper are bending and torsional equivalent moments of area, and elastic energy and maximum stresses developed in the flattened booms. The proposed method has been validated against finite-element solutions and is shown to be sufficiently accurate to be safely used for preliminary design of lenticular booms.
Publisher: Wiley
Date: 23-05-2018
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 07-2006
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 11-2004
Publisher: Springer Science and Business Media LLC
Date: 11-12-2014
Publisher: Wiley
Date: 02-1996
Publisher: Wiley
Date: 1996
Publisher: Elsevier BV
Date: 10-2015
Publisher: Elsevier BV
Date: 05-2010
Publisher: Elsevier BV
Date: 11-2011
Publisher: SAGE Publications
Date: 12-2022
DOI: 10.1177/16878132221143873
Abstract: Foldover is a common, yet complex, transient boundary condition in several ‘metal forming processes’ including the barrelling compression test (BCT). The onset of foldover during BCT is comparable to that of necking in the tensile test. However, its role in flow curve identification has been ignored in the current literature. Methods to detect and measure its onset and growth during the processes are also not available. We propose three methods to identify the onset of foldover and measure its progress with deformation. These are conducted together with case studies of BCT to have a fundamental understanding of the onset and growth of foldover in the test and more general cases. Experimental and numerical methods are developed to accomplish this based on (1) direct measurement using tracing points, (2) energy-based and (3) geometry-based indirect measurements. These outline the required supplementary data and allow proper detection of the onset. In the first method, the migration of tracing points from the free surface to the platen-s le interface, simulated numerically, is monitored and measured visually. The second method employs the load-stroke data to calculate the total power input to the deforming system. In the third method, a criterion has been derived to detect the onset of foldover by monitoring the geometry of the s le profile during the test and comparing it to a reference quadratic profile. The observations and outputs of each method are compared and discussed.
Publisher: Springer Science and Business Media LLC
Date: 14-09-2017
Publisher: ASME International
Date: 09-09-2009
DOI: 10.1115/1.3120394
Abstract: The twinning-induced plasticity (TWIP) phenomenon is established as the most effective mechanism to enhance the formability of the advanced high-Mn (15–30 wt %) austenitic steels (known as TWIP steels). As the formability is very sensitive to the steel microstructure, the study of their hot deformation characteristics is highly desired. The aim of the present work is to investigate the effects of strain rate on the high temperature flow behavior, dynamic recrystallization (DRX) and the microstructural evolution of a grade of TWIP steels (with 29 wt % Mn) through single hit compression testing. The hot compression tests were carried out at two different temperatures (850°C and 1150°C) applying a range of strain rates (0.001–0.1 s−1). The results indicated a greater deformation resistance at higher strain rates. The detected broad stress peaks at higher strain rates were related to the occurrence of DRX. The microstructural studies revealed that, in addition to DRX, a geometrical dynamic recrystallization occurred at 850°C. This results in a microstructure with finer equiaxed grains.
Publisher: Elsevier BV
Date: 04-2011
Publisher: Wiley
Date: 07-12-2013
Publisher: Trans Tech Publications, Ltd.
Date: 06-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.690.173
Abstract: A potential severe plastic deformation process known as axi-symmetrical forward spiral extrusion (AFSE) has been studied numerically and experimentally. The process is based on the extrusion of cylindrical s les through a die with engraved spiral grooves in a near zero shape change manner. The process was simulated using a three dimensional finite element (FE) model that has been developed using commercial software, ABAQUS. In order to verify the finite element results, hot rolled and annealed s les of the alloy were experimentally processed by AFSE. The required extrusion forces during the process were estimated using the FE model and compared with the experimental values. The reasonable agreement between the FE results and experimental data verified the accuracy of the FE model. The numerical results indicate the linear strain distribution in the AFSE s le is only valid for a core concentric while the strain distribution in the vicinity of the grooves is non axi-symmetric. The FE simulation results from this research allows a better understanding of AFSE kinematics especially near the grooves, the required extrusion force and the resultant induced strain distribution in the s le. To compare the mechanical properties of the Mg-1.75Mn alloy before and after the process, a micro shear punch test was used. The tests were performed on s les undergoing one and four passes of AFSE. After four passes of AFSE, it was observed that the average shear strength of the alloy has improved by about 21%. The developed finite element model enables tool design and material flow simulation during the process.
Publisher: Elsevier BV
Date: 04-2010
Publisher: Elsevier BV
Date: 05-2003
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 02-2014
Publisher: Elsevier BV
Date: 2011
Publisher: Springer Science and Business Media LLC
Date: 24-04-2015
Publisher: Elsevier BV
Date: 08-2014
Publisher: Elsevier BV
Date: 2011
Publisher: Wiley
Date: 14-12-2016
Publisher: Elsevier BV
Date: 10-2008
Publisher: Elsevier BV
Date: 07-2012
Publisher: Springer Science and Business Media LLC
Date: 03-2010
Publisher: Wiley
Date: 29-06-2017
Publisher: Springer Science and Business Media LLC
Date: 25-02-2016
Publisher: Elsevier BV
Date: 07-2018
No related grants have been discovered for shahin khoddam.