Veronica Gray

Veronica Gray
Queensland University of Technology | QUT · School of Chemistry, Physics and Mechanical Engineering

B. Eng. (Mechanical) Hons & B. Sc. (Physics), PhD

About

26
Publications
13,916
Reads
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90
Citations
Additional affiliations
February 2018 - present
Queensland University of Technology
Position
  • Lecturer
Description
  • Lecturing and delivery of research
January 2014 - December 2017
Swansea University
Position
  • PostDoc Position
Description
  • Collaborating with Rolls Royce plc on creep, fatigue and microstructure. Speciality of very high temperature creep testing, fundamentals, and transient creep. Research into power generation and aerospace steels, and, single/polycrystal nickel superalloys.
June 2012 - present
NSW Technical and Further Education Commission (TAFE NSW)
Position
  • ECDIS Course Writer and Editor
Description
  • Write and update ECDIS training materials for Hunter and Sydney TAFE.
Education
April 2010 - February 2014
The University of Newcastle, Australia
Field of study
  • Single Crystal Elastic Constants of MAX Phase Ceramics from Inelastic Neutron Scattering of Polycrystals
February 2004 - December 2008
The University of Newcastle, Australia
Field of study
  • Mechanical Engineering
January 2004 - December 2008

Publications

Publications (26)
Article
The magnitude of the single-crystal elastic constant c44 in the MAX phase Ti3SiC2 is under debate. In this paper, estimates for the magnitude of c44 for MAX phases Ti3AlC2 and Ti3SiC2 are determined from a partially oriented polycrystalline sample via coherent inelastic neutron scattering. The largely quasi-isotropic nature of these Mn+1AXn phase e...
Article
Full-text available
This paper details the development and assessment of a new empirical creep model that belongs to the limited ranks of models reproducing full creep curves. The important features of the model are that it is fully standardised and is universally applicable. By standardising, the user no longer chooses functions but rather fits one set of constants o...
Article
Observed differences between measured and calculated elastic constants for Ti3SiC2 are investigated using Density Functional Theory and Inelastic Neutron Scattering. The agreement between the calculated lattice dynamics and the dynamics measured by inelastic neutron scattering is considered good except at energies below ~20 meV where discrepancies...
Article
Full-text available
The effect of austenitization temperature, aging temperature, and, aging time on the development of precipitates in a novel maraging steel known as F1E was investigated. The investigation primarily employed small angle neutron scattering (SANS) coupled with thermal calculations, atom probe tomography (APT) and electron microscopy (SEM, STEM, TEM)....
Research
Full-text available
This is the Institute of Structural Materials Website. It was created by myself to promote our institution. the website contains basic concepts of how jet engines work, materials concepts and mechanical testing descriptions. It also includes our current research and opportunities.
Article
Thermo-Mechanical Fatigue (TMF) is one of the most complex mechanical phenomena that couples creep, fatigue and oxidation. So far, developing simple empirical relationships like those that exist in isothermal equivalents have proven elusive. This work presents a study on the TMF behaviour of the aerospace nickel based superalloy RR1000 using TMF fa...
Conference Paper
Full-text available
The Australian Solar Thermal Research Institute (ASTRI) is currently extending their research into supercritical CO2 Concentrated Solar-thermal Power (CSP) capability development. This new phase of research focuses of developing the knowledge and skills required for realizing CSP with a particular focus on the design, operation and maintenance of i...
Article
Full-text available
With the drive towards cost-effective routes for the manufacture of engineering components, flow forming technologies are now under consideration for the production of structural axisymmetric geometries such as tubes and cones. This near net shape process is known to offer improvements in material utilisation when compared with traditional processe...
Article
Full-text available
Building on a previous study of the novel aerospace maraging steel known as F1E, SANS and atom probe tomography (APT) have been used to study three variant chemistries designed to impact the growth and development of either laves or β-phase precipitates. One chemistry reduced the available laves forming elements, Mo and W, resulting in a reduction...
Chapter
Full-text available
Lifing of components which are likely to be subject to high temperature creep deformation is a critical area to a range of industries, particularly power generation and aerospace. In particular, extrapolation of short term data to predict long-term allowable creep stresses is an area of significant importance, since no appropriate method of acceler...
Chapter
Full-text available
There are many applications where the combination of stress and elevated temperature require creep to be considered during the design process. For some applications, an evaluation of rupture life for given conditions is sufficient, however, for components such as those in gas turbine aeroengines, the accumulation of creep strain over time and the e...
Article
Nanolaminates such as the Mn+1AXn (MAX) phases are a class of materials with hexagonal crystal structure for which ab-initio derived elasticity tensors have been published due to sizeable single-crystals not being available. Single crystal elastic constants, however, are fundamental to understanding phase transitions, and a range of mechanical, fra...
Article
Full-text available
This paper explores the concept of creep activation energy, comparing the currently used Arrhenius equation to an outcome of the using Gibbs free energy. The consequence of these differing approaches is illustrated using large datasets. By examining the fundamental approach to creep activation energy, this article highlights potential advances in t...
Conference Paper
Full-text available
In developing more accurate lifing models for critical aerospace components, knowledge of the development of evolving stress conditions is required to make appropriate predictions. Traditional approaches have been based around data conducted under isostress and isothermal conditions, enabling the development of constitutive relationships. However,...
Conference Paper
Full-text available
In developing more accurate lifing models for critical aerospace components, knowledge of the development of evolving stress conditions is required to make appropriate predictions. Traditional approaches have been based around data conducted under isostress and isothermal conditions, enabling the development of constitutive relationships. However,...
Presentation
Full-text available
This is a presentation for the IOM3 aimed at high school students. It introduces basic concepts of the structure and properties of materials. This part of outreach and engagement activities. Slides and animations are welcomed to be re-used when properly cited.
Research
Full-text available
Sketchfab is a 3D interactive modelling display tool. On this website is interactive 3D models of crystal structures and jet engines created by myself. The models are for educational purposes and can be useful as a teaching resource. These models are welcome to be used by other institutions with citation.
Research
Full-text available
This is the YouTube channel which hosts a range of scientific animations made by myself. Animations including diffusion, dislocation, TMF, small punch and environmental testing are available. These animations have been created for teaching purposes and are welcomed to be used by other institutions with citation. https://www.youtube.com/channel/UCLf...
Article
Full-text available
For the first time detailed measurements of the DOS (density of states) for Ti3AlC2 and Ti3SiC2 are presented at temperatures between T = 10 and 100 K. For Ti3AlC2 a DFT (density functional theory) simulation of lattice dynamics is compared to experimental data demonstrating a noticeable difference between the spectra especially below 40 meV. In th...
Conference Paper
Full-text available
Over the past 20 years understanding the phenomenon known as creep has been fuelled by the demand for higher performing materials across all industries. It is arguably because of the broad nature of creep that many models and methods have been developed in order to predict this phenomenon. Although creep presents a complex and difficult problem for...
Research
Full-text available
It has been noted that creep models may appear as simple equations but when it comes to actually using them it isn’t so straight forward. This document has been written to show how to predict failure or rupture time using well known creep models. NOTE: This document does not evaluate the models, nor makes recommendations in choosing a model. It is...
Article
Full-text available
This letter explores issues surrounding region splitting, a current technique used to improve creep life predictions. The history of the technique is discussed briefly and its current implementation by major research groups described in more detail. An example of novel or non-traditional region splitting is also explored with its first known applic...
Conference Paper
With the recent completion of the Time of Flight (TOF) instrument Pelican, ANSTO now has expanded its capability to investigate inelastic incoherent neutron scattering (IINS). Similar TOF machines TOSCA, ISIS, UK and Pharos, LANL, USA have been recently used to investigate single crystal elastic tensors for the metallic-ceramic nanolaminates Ti3SiC...
Conference Paper
This conference presentation applies the Wilshire Equations to Grade 91 Steels demonstrating the method step-by-step, and results.
Thesis
Full-text available
his thesis explores the harmonic and isotropic nature of Ti3SiC2 and Ti3AlC2 by taking an experimental approach. This approach would have been greatly simplified if a sizeable single crystal of these materials was available, but as this is not the case currently, more complex experiments and analysis has been done in order to characterise the mater...
Article
Full-text available
The deformation of structural alloys presents problems for power plants and aerospace applications due to the demand for elevated temperatures for higher efficiencies and reductions in greenhouse gas emissions. The materials used in such applications experience harsh environments which may lead to deformation and failure of critical components. To...

Projects

Projects (5)