ORCID Profile
0000-0003-4121-0197
Current Organisation
RMIT University
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Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 09-2017
Publisher: Walter de Gruyter GmbH
Date: 15-03-2016
Abstract: Dough extension tests are used in industry to rate flours for dough processability. The results impact flour selection for product use. Previously, it was shown that dough extension data correlated poorly with dough sheetability irrespective of whether doughs were tested fresh or rested. It was noted that s le shapes varied between specimens of flours. To understand how s le shape affects extensigraph tests, a finite element (FE) simulation-based approach was taken. Real extensigraph s les were drawn on a computer equipped with the commercial FE package ABAQUS and using the anisotropic Bergstrom Boyce model with Mullins damage (ABBM) constitutive model to describe the dough’s rheology. Results show that the force–extension traces were affected by s le shape, and that thinning occurs more from the sides than the bulk for slumped s les. The FE predictions for s le shape effects on hook force were validated against real tests. Similar dependencies on s le shape are also predicted for the alveograph and Kieffer micro-extensigraph tests.
Publisher: Elsevier BV
Date: 03-2021
Publisher: Walter de Gruyter GmbH
Date: 06-02-2016
Abstract: The Brabender Extensigraph is commonly used to measure dough strength by stretching a strand of dough until it tears. Data for extension and force are used to rate flours for strength, baking and processing qualities of doughs. The present study was carried out to examine how dough strength relates to dough sheetability. The latter was measured using an instrumented dough sheeter which provided data for dough thickness and roll-closing forces as a pad of dough was sheeted by passing back and forth through a set of rollers with reducing roll-gaps. Doughs were tested fresh and after 45 min of resting for a range of flours. The correlations between dough strength and dough sheetability were poor at all times. The roll forces were affected by dough thickness at each pass indicating dough elasticity affected dough stretchability. Doughs were found to become more elastic following resting.
Publisher: Elsevier BV
Date: 2018
Publisher: American Chemical Society (ACS)
Date: 20-11-2009
DOI: 10.1021/LA903334M
Abstract: Polymer films may be formed by drying aqueous suspensions of colloidal polymer particles (latexes) on a substrate. Higher-performance films may be obtained by using nanocomposite particles in the latexes. In particular, polymer-clay nanocomposites show good potential in producing stiff, optically transparent, scratch-resistant coatings. The final film must be continuous (i.e., crack-free). This work predicts the minimum temperature, relative to the glass-transition temperature, at which a given suspension forms a crack-free nanocomposite film. The model extends a previous model for film formation with inclusion-free latexes (Routh, A. F. Russel, W. B. Langmuir 1999, 15, 7762-7773). The inclusions are modeled as rigid cylinders, and the polymer is modeled as linearly viscoelastic. The major term arising in the extended model is the interfacial shear stress between the polymer and the inclusions. Film formation slows as the shear stress increases, and this effect is proportional to the magnitude of the stress, the inclusion volume fraction, and the inclusion aspect ratio.
Publisher: Elsevier BV
Date: 09-2016
Publisher: Wiley
Date: 2007
DOI: 10.1002/NME.2040
Publisher: Elsevier BV
Date: 11-2017
Publisher: Informa UK Limited
Date: 14-03-2022
Publisher: Elsevier BV
Date: 04-2013
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 11-2012
Publisher: Elsevier BV
Date: 08-2023
Publisher: Springer Science and Business Media LLC
Date: 16-09-2022
DOI: 10.1007/S00170-022-10145-Y
Abstract: A powder-based laser metal deposition (LMD) system can fabricate customised three-dimensional (3D) parts, layer by layer, based upon a computer-aided design (CAD) model. However, the deposition will not always feature the expected geometry due to excessive heat input and inconsistent powder flow. Due to the layer-by-layer nature of LMD, geometrical error in one layer is compounded in all following layers and may result in a build failure. Thus, it is critical to monitor online the track and layer height. This study developed an in situ monitoring system integrating a webcam and a narrow bandpass filter. The laser owder defocus distance was extracted from the melt pool images, and the track/layer height was calculated from the laser owder defocusing distance and preprogrammed layer spacing. The presented approach does not need additional illumination sources and is a nonintrusive online method. Therefore, it is a potential precursor to a feedback build height control system. It also can be used for measuring omnidirectional height, i.e. height in different build directions relative to the substrate, which has been tested by fabricating two thin-wall structures with customised shapes. These online-measured height data were successfully validated against dimensional measurements from an offline 3D scanner, thus demonstrating the online system’s potential utility in a feedback control system for ensuring acceptable part geometrical accuracy.
Publisher: Elsevier BV
Date: 03-2006
Publisher: Elsevier BV
Date: 05-2013
Publisher: Elsevier BV
Date: 09-2006
DOI: 10.1016/J.EJPS.2006.04.011
Abstract: Extensive movement of the liquid phase relative to the solids in solid-liquid pastes during extrusion forming is an undesirable process phenomenon. The impact of formulation and flow pattern on liquid phase migration (LPM) during extrusion of model pharmaceutical pastes (40-50 wt% microcrystalline cellulose/water) has been investigated by ram extrusion through square-entry and 45 degrees conical-entry dies, and by lubricated squeeze flow (extensional flow). Threshold velocities for LPM were observed in both configurations. Squeeze flow testing showed that dilation during extension can cause LPM, while ram extrusion featured both dilation effects and drainage due to compaction. The threshold velocities observed in the two configurations agreed when presented as characteristic shear rates. The threshold velocity increased with paste solids content.
Publisher: Elsevier BV
Date: 03-2009
Location: Australia
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Milan Patel.