Mr Alexander Gregg

Mr Alexander Gregg

Casual Academic

School of Electrical Engineering and Computing (Mechanical Engineering)

Career Summary

Biography

I am a final-year PhD candidate and casual lecturer.

My research is in the field of strain estimation using neutrons, particularly tomography from Bragg-edge neutron transmission measurements.

I lecture ENGG2440, a second-year engineering modelling and control course. I have also taught into a number of first, second and third year courses in the mechanical and mechatronics engineering programs.

I supervise NU Racing, the university Formula SAE team. Please contact me for final-year-project or general team enquiries.


Qualifications

  • Bachelor of Engineering (Honours), University of Newcastle

Keywords

  • Mechanical Engineering
  • Neutron Strain Measurement

Fields of Research

Code Description Percentage
091399 Mechanical Engineering not elsewhere classified 100

Professional Experience

UON Appointment

Title Organisation / Department
Casual Academic University of Newcastle
School of Electrical Engineering and Computing
Australia

Awards

Teaching Award

Year Award
2019 2018 Vice Chancellor's Award for Teaching Excellence and Contribution to Student Learning - Sessional Staff Award
The University of Newcastle
2018 2018 FEBE Sessional Staff Teaching Excellence Award
The University of Newcastle

Teaching

Code Course Role Duration
ENGG2440 Modelling and Control
The University of Newcastle
Lecturer 1/07/2019 - 1/12/2019
MCHA2000 Mechatronic Systems
The University of Newcastle
Lecturer 1/07/2017 - 1/12/2017
ENGG2440 Modelling and Control
The University of Newcastle
Lecturer 1/07/2018 - 1/12/2018
MCHA2000 Mechatronic Systems
The University of Newcastle
Summer Offering
Lecturer 1/01/0001 - 1/01/0001
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Journal article (5 outputs)

Year Citation Altmetrics Link
2018 Jidling C, Hendriks J, Wahlström N, Gregg A, Schön TB, Wensrich C, Wills A, 'Probabilistic modelling and reconstruction of strain', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 436 141-155 (2018) [C1]
DOI 10.1016/j.nimb.2018.08.051
Citations Scopus - 4Web of Science - 3
Co-authors Adrian Wills, Christopher Wensrich
2018 Gregg AWT, Hendriks JN, Wensrich CM, Wills A, Tremsin AS, Luzin V, et al., 'Tomographic Reconstruction of Two-Dimensional Residual Strain Fields from Bragg-Edge Neutron Imaging', PHYSICAL REVIEW APPLIED, 10 (2018) [C1]
DOI 10.1103/PhysRevApplied.10.064034
Citations Scopus - 4Web of Science - 4
Co-authors Christopher Wensrich, Erich Kisi, Mike Meylan, Adrian Wills
2017 Gregg AWT, Hendriks JN, Wensrich CM, Meylan MH, 'Tomographic reconstruction of residual strain in axisymmetric systems from Bragg-edge neutron imaging', Mechanics Research Communications, 85 96-103 (2017) [C1]
DOI 10.1016/j.mechrescom.2017.08.012
Citations Scopus - 4Web of Science - 3
Co-authors Christopher Wensrich, Mike Meylan
2017 Hendriks JN, Gregg AWT, Wensrich CM, Tremsin AS, Shinohara T, Meylan M, et al., 'Bragg-edge elastic strain tomography for in situ systems from energy-resolved neutron transmission imaging', PHYSICAL REVIEW MATERIALS, 1 (2017) [C1]
DOI 10.1103/PhysRevMaterials.1.053802
Citations Scopus - 9Web of Science - 10
Co-authors Mike Meylan, Christopher Wensrich, Erich Kisi
2016 Wensrich CM, Hendriks JN, Gregg A, Meylan MH, Luzin V, Tremsin AS, 'Bragg-edge neutron transmission strain tomography for in situ loadings', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 383 52-58 (2016) [C1]

© 2016 An approach for tomographic reconstruction of three-dimensional strain distributions from Bragg-edge neutron transmission strain images is outlined and investigated. This a... [more]

© 2016 An approach for tomographic reconstruction of three-dimensional strain distributions from Bragg-edge neutron transmission strain images is outlined and investigated. This algorithm is based on the link between Bragg-edge strain measurements and the Longitudinal Ray Transform, which has been shown to be sensitive only to boundary displacement. By exploiting this observation we provide a method for reconstructing boundary displacement from sets of Bragg-edge strain images. In the case where these displacements are strictly the result of externally applied tractions, corresponding internal strain fields can then be found through traditional linear-static finite element methods. This approach is tested on synthetic data in two-dimensions, where the rate of convergence in the presence of measurement noise and beam attenuation is examined.

DOI 10.1016/j.nimb.2016.06.012
Citations Scopus - 10Web of Science - 9
Co-authors Mike Meylan, Christopher Wensrich
Show 2 more journal articles

Conference (2 outputs)

Year Citation Altmetrics Link
2017 Gregg AWT, Hendriks JN, Wensrich CM, 'Bragg-edge neutron strain tomography: A review and path forward to general tomographic reconstruction', 9th Australasian Congress on Applied Mechanics, ACAM 2017 (2017)

© 2017 National Committee on Applied Mechanics. All Rights Reserved. Understanding and measuring strain is of crucial importance for engineers and scientists, and tomographic reco... [more]

© 2017 National Committee on Applied Mechanics. All Rights Reserved. Understanding and measuring strain is of crucial importance for engineers and scientists, and tomographic reconstruction of residual strain holds the potential to revolutionise the way in which solids mechanics research is carried out. Bragg-edge neutron transmission measurements have been at the centre of tomographic reconstruction efforts for the past decade, but to date no reconstruction algorithm for residual strain in the general case has been developed. In this paper, we review recent developments in this field and outline a path toward general tomographic reconstruction.

Co-authors Christopher Wensrich
2017 Wensrich CM, Gregg AWT, Hendriks JN, Aggarwal R, Tremsin AS, Shinohara T, et al., 'Bragg-edge elastic strain tomography', 9th Australasian Congress on Applied Mechanics, ACAM 2017 (2017)

© 2017 National Committee on Applied Mechanics. All Rights Reserved. Time-of-flight neutron imaging has now progressed to the point where high-resolution energy-resolved imaging i... [more]

© 2017 National Committee on Applied Mechanics. All Rights Reserved. Time-of-flight neutron imaging has now progressed to the point where high-resolution energy-resolved imaging is possible. Among many other applications, this technology allows the imaging of elastic strain fields within polycrystalline solids using a geometry identical to a traditional radiograph. 3D strain tomography from measurements such as these has been a current topic of research over the past decade. The Authors recently solved this tomography problem and provided a reconstruction algorithm for the set of all systems subject to external loads in the absence of residual or eigenstrain. In this paper we provide an overview of a recent experiment carried out at the J-PARC pulsed neutron source in Japan focused on demonstrating this algorithm. This now represents the first-ever practical demonstration of Bragg-edge neutron transmission strain tomography in a non-axisymmetric system. The results of the experiment are presented along with validation of the reconstructed field through Digital Image Correlation and traditional constant wavelength neutron strain scanning within the Australian Centre for Neutron Scattering at ANSTO. An outlook on potential strategies for reconstruction in the general case is also provided.

Co-authors Christopher Wensrich, Erich Kisi, Mike Meylan
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Grants and Funding

Summary

Number of grants 6
Total funding $132,980

Click on a grant title below to expand the full details for that specific grant.


20191 grants / $31,920

ACNS Beamtime Proposal: 8433$31,920

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Alexander Gregg, Christopher Wensrich, Vladimir Luzin

Scheme ACNS Beamtime Proposal: KOWARI
Role Lead
Funding Start 2019
Funding Finish 2020
GNo
Type Of Funding Not Known
Category UNKN
UON N

20183 grants / $63,520

ACNS Beamtime Proposal: 7318$30,960

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Alexander Gregg, Christopher Wensrich, Vladimir Luzin

Scheme ACNS Beamtime Proposal: KOWARI
Role Lead
Funding Start 2018
Funding Finish 2019
GNo
Type Of Funding Not Known
Category UNKN
UON N

ACNS Beamtime Proposal: 7094$22,560

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Alexander Gregg, Christopher Wensrich, Vladimir Luzin

Scheme ACNS Beamtime Proposal: KOWARI
Role Lead
Funding Start 2018
Funding Finish 2018
GNo
Type Of Funding Not Known
Category UNKN
UON N

Course Enhancement Project Funding$10,000

Funding body: The University of Newcastle

Funding body The University of Newcastle
Project Team

Alexander Gregg, Adrian Wills, Yuen Yong

Scheme NeW Education Framework
Role Lead
Funding Start 2018
Funding Finish 2018
GNo
Type Of Funding Internal
Category INTE
UON N

20172 grants / $37,540

AINSE Post Graduate Research Award$22,500

Funding body: AINSE (Australian Institute of Nuclear Science & Engineering)

Funding body AINSE (Australian Institute of Nuclear Science & Engineering)
Project Team

Alexander Gregg, Christopher Wensrich

Scheme Postgraduate Research Award (PGRA)
Role Lead
Funding Start 2017
Funding Finish 2020
GNo
Type Of Funding Not Known
Category UNKN
UON N

ACNS Beamtime Proposal: 6461$15,040

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Alexander Gregg, Christopher Wensrich, Vladimir Luzin

Scheme ACNS Beamtime Proposal: KOWARI
Role Lead
Funding Start 2017
Funding Finish 2017
GNo
Type Of Funding Not Known
Category UNKN
UON N
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Research Supervision

Number of supervisions

Completed1
Current10

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2019 Honours FSAE: Business Intelligence Mechanical Engineering, The University of Newcastle Principal Supervisor
2019 Honours FSAE: Chief Mechanical Engineer Mechanical Engineering, The University of Newcastle, Australia Principal Supervisor
2019 Honours FSAE: Battery Management and Maintenance Mechanical Engineering, The University of Newcastle, Australia Principal Supervisor
2019 Honours FSAE: Team Leadership and Chassis Design Mechanical Engineering, The University of Newcastle Principal Supervisor
2019 Honours FSAE: HV Electronics and Accumulator Design Mechanical Engineering, The University of Newcastle, Australia Principal Supervisor
2019 Honours FSAE: Torque Vectoring Mechanical Engineering, The University of Newcastle, Australia Principal Supervisor
2019 Honours FSAE: LV Electronics and CCU Design Mechanical Engineering, The University of Newcastle, Australia Principal Supervisor
2019 Honours Design of a single-donor Locost Clubman Mechanical Engineering, The University of Newcastle Principal Supervisor
2019 Honours FSAE: Continuum Electrical Systems Mechanical Engineering, The University of Newcastle, Australia Principal Supervisor
2019 Honours FSAE: Cooling System and Wheel-Centre Design Mechanical Engineering, The University of Newcastle, Australia Principal Supervisor

Past Supervision

Year Level of Study Research Title Program Supervisor Type
2019 Honours Four-Wheel Suspension Modelling using MATLAB and Simulink Mechanical Engineering, The University of Newcastle Co-Supervisor
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Mr Alexander Gregg

Position

Casual Academic
School of Electrical Engineering and Computing
Faculty of Engineering and Built Environment

Focus area

Mechanical Engineering

Contact Details

Email alexander.gregg@newcastle.edu.au

Office

Room ES320
Building ES320
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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