Dr Rachel Tomlinson

BEng, PhD, CEng, FIMechE

Dr Rachel Tomlinson

Senior Lecturer

Director of Undergraduate Teaching

Department of Mechanical Engineering
The University of Sheffield
Mappin Street
Sheffield
S1 3JD

Telephone: +44 (0) 114 222 7757
Fax: +44 (0) 114 222 7890

email : r.a.tomlinson@sheffield.ac.uk


Profile

Rachel Tomlinson was awarded her PhD in Experimental Mechanics from the University of Sheffield in 1995 and graduated with a BEng degree in 1991 in Mechanical Engineering from the same institution. Her PhD was sponsored by British Aerospace Airbus Ltd and following this became a research associate in the Experimental Stress Analysis Laboratory at the University of Sheffield, working on projects supported by EPSRC ROPA, Airbus UK, Rolls Royce plc, SNECMA (Paris), and the Defence Research Agency. She has expertise in several areas of experimental mechanics including automated photoelasticity, thermoelasticity, caustics and fracture mechanics.
Rachel was appointed as a lecturer in 1998 and was promoted to Senior Lecturer in January 2007.

Other professional achievements:

  • Fellow of the Institution of Mechanical Engineers
  • Member of the British Society for Strain Measurement and actively organises conferences and seminars
  • Editorial member of "Strain - the official Journal of the European Association for Experimental Mechanics (EURASEM)"
  • Member of the Women’s Engineering Society

Research Areas

As part of the Experimental Mechanics Laboratory, current research projects are in the development and use of optical instruments to measure strain in a wide range of applications, such as particulate reinforced materials, automotive glass, and aircraft components.

Digital Image Correlation techniques are being used to study damage in particulate reinforced materials. A range of particulate toughened polymers are being studied: to investigate experimentally the deformation mechanisms around the particles; to identify and characterise the potential failure mechanisms through experiment; and to explore how these mechanisms can be modelled mathematically. The work is sponsored by Cytec Engineered Materials Ltd, who are global providers of technologically advanced composite materials for high performance aerospace and automotive applications.

Within safety critical industries, such as in aircraft manufacture, numerical analyses need to be verified by experiment. However both the cost of development tests and the time taken to perform them are considerably greater than the cost and time required to conduct Finite Element Analyses (FEA). Airbus are sponsoring research into the use of Additive Layer Manufacturing (ALM) techniques to accurately produce scaled structural models for the aerospace industry with the aim of improving efficiency of design.

Asymmetric stress profiles through glass may be measured using magnetophotoelasticity. Pilkington plc are sponsoring research into developing a full-field magnetopolariscope system, which will enable more effective measurement of residual stress in glass. Non-destructive methods to measure stresses in three-dimensional photoelastic models of engineering components are being investigated. A joint research project with The University of Manchester is developing a new instrument using tomographic techniques, which will allow experimental verification of design prototypes to be performed quickly and efficiently.

Thermoelastic stress analysis techniques are being used in a number of different areas including exploring why a crack grows in the direction that it does, and investigating damage in polymers and elastomers used in the oilfield industry.

Other areas of interest are with birefringent fluids with applications in a wide variety of practical engineering problems, e.g. flow through micro-channels; unsteady flows; biological flows; and classic fluid dynamics problems, and using photoelasticity in medical and dental applications.

Research Projects

  • Using additive layer manufacture to produce scaled structural models – with Airbus
  • Multi-scale damage modelling of particulate reinforced materials - with Cytec Engineered Materials Ltd.
  • New photoelastic techniques to measure 3D strain fields - with the University of Manchester
  • Novel experimental techniques to investigate fatigue crack growth
  • Photoelasticity in medical and dental applications
  • Birefringent fluids for validation of CFD modelling of 3D fluid flow
  • Thermal methods to investigate viscoelastic materials

Teaching

MEC302 Integrity of Materials and Components

MEC405 Experimental Stress Analysis

Journal articles

Conference proceedings papers

  • Ziglam A & Tomlinson RA (2016) 3D Digital Photoelasticity for Load Transfer Measurements in Dental Applications. BSSM International Conference on Advances in Experimental Mechanics Sept.2016
  • Tomlinson RA & Kuppusamy N (2016) The effect of particles in toughening and fracture behaviour in a resin system. 17th International Conference on Experimental Mechanics, Rhodes, Greece,
  • Tomlinson RA & Salmon Guzman F (2016) Life assessment of particle interleaved CFRP laminates using lock-in thermography. 17th International Conference on Experimental Mechanics, 4 July 2016 - 7 July 2016.
  • Wickramasinghe KS, Tomlinson RA & Rongong JA (2015) In situ observation of NiTi transformation behaviour: A micro-macro approach. Conference Proceedings of the Society for Experimental Mechanics Series, Vol. 6 (pp 13-20) View this article in WRRO
  • Tayefi P, Beck SBM & Tomlinson RA (2015) Fatigue Failure of Polyethylene Electrofusion Joints Subject to Contamination. Conference Proceedings of the Society for Experimental Mechanics Series, Vol. 66(VOLUME 5) (pp 197-202) View this article in WRRO
  • Tomlinson RA, Aui Yong WK, Morton G & Taylor ZA (2014) Development of tissue surrogates for photoelastic strain analysis of needle insertion. SEM Annual Conference on Experimental and Applied Mechanics. Greenville, USA, 2 June 2014 - 5 June 2014. View this article in WRRO
  • Okioga AN, Greene RJ & Tomlinson RA (2014) Quantifying residual strains in specimens prepared by additive layer manufacturing. Conference Proceedings of the Society for Experimental Mechanics Series, Vol. 8 (pp 245-252) View this article in WRRO
  • Tomlinson RA, Amjad K & Urra GG (2014) Crack growth study of fibre metal laminates using thermoelastic stress analysis. Conference Proceedings of the Society for Experimental Mechanics Series, Vol. 8 (pp 39-45)
  • Okioga AN, Greene RJ, Patrick DG & Tomlinson RA (2014) Analysis of stress distribution caused by orthodontic correctional devices. Conference Proceedings of the Society for Experimental Mechanics Series, Vol. 4 (pp 67-73)
  • Hussain AK, Mahmud J & Tomlinson RA (2013) Detecting microscopic defects in aged thermoplastic using thermoelastic technique. BEIAC 2013 - 2013 IEEE Business Engineering and Industrial Applications Colloquium (pp 822-826)
  • Patterson EA, Crimp M, Tomlinson RA & Yang Y (2012) Measuring crack tip strain at the microscale. Proc. Joint ISEM, ACEM, SEM, 7th ISEM. Taipei, 8 November 2012 - 11 November 2012.
  • Jones SA & Tomlinson RA (2012) Fracture parameter extraction from DIC displacement field in epoxies. Proceedings of 15th International Conference on Experimental Mechanics. Porto, Portugal, 22 July 2012 - 27 July 2012.
  • Jones SA & Tomlinson RA (2012) Mixed-mode (I/II) fracture study of epoxies using digital image correlation. Proc of 15th International Conference on Experimental Mechanics. Porto, Portugal, 22 July 2012 - 27 July 2012.
  • Jones SA & Tomlinson RA (2012) Mixed-mode (I/II) fracture study of epoxies using digital image correlation. 15th European Conference of Composite Mechanics (ECCM15). Venice, Italy, 24 June 2012 - 28 June 2012.
  • Tomlinson RA & Patterson EA (2011) Examination of crack tip plasticity using thermoelastic stress analysis. Conference Proceedings of the Society for Experimental Mechanics Series, Vol. 7 (pp 123-129)
  • Tomlinson RA (2011) Crack tip stress fields under biaxial loads using TSA. Conference Proceedings of the Society for Experimental Mechanics Series, Vol. 6 (pp 275-278)
  • Tomlinson RA, Du Y & Patterson EA (2011) Understanding crack tip plasticity-a multi-experimental approach. Applied Mechanics and Materials, Vol. 70 (pp 153-158)
  • Tomlinson RA (2010) Crack tip stress fields under biaxial loads using TSA. Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010, Vol. 2 (pp 1025-1028)
  • Cooke WR, Tomlinson RA, Burguete RL, Johns D, Vanard GJC & Featherston CA (2009) Using selective laser sintering to produce scaled structural models. Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009, Vol. 4 (pp 2752-2761)
  • Conway AR, Tomlinson RA & Jewell GW (2009) Development of a versatile pulsed magneto-polariscope. Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009, Vol. 3 (pp 1767-1775)
  • Zanganeh M, Tomlinson RA & Yates JR (2008) T-stress determination using TSA and DIC. 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, Vol. 1 (pp 595-602)
  • Hussain AK, Greene RJ & Tomlinson RA (2008) The viability of using thermoelastic stress analysis on rubber at small strain. Society for Experimental Mechanics - 11th International Congress and Exhibition on Experimental and Applied Mechanics 2008, Vol. 3 (pp 1237-1244)
  • Zanganeh M, Tomlinson RA & Yates JR (2008) T-stress determination using digital image correlation. Society for Experimental Mechanics - 11th International Congress and Exhibition on Experimental and Applied Mechanics 2008, Vol. 1 (pp 511-517)
  • Tomlinson RA, Calvert GC & Conway AR (2008) A photoelastic investigation into spontaneous glass fracture. Society for Experimental Mechanics - 11th International Congress and Exhibition on Experimental and Applied Mechanics 2008, Vol. 4 (pp 1829-1836)
  • Conway AR, Tomlinson RA & Jewell GW (2008) Advances in the characterization of the residual stress distribution in thermally toughened glass - Using pulsed magneto-photoelasticity. Society for Experimental Mechanics - 11th International Congress and Exhibition on Experimental and Applied Mechanics 2008, Vol. 4 (pp 1837-1845)
  • Spalton T, Tomlinson RA, Garrard AE & Beck SBM (2008) Streaming Birefringence - A Step Forward. ADVANCES IN EXPERIMENTAL MECHANICS VI, Vol. 13-14 (pp 23-28)
  • Hussain A, Greene R & Tomlinson RA (2007) Thermal effects in viscoelastic materials. Proceedings of 13th International Conference on Experimental Mechanics. The Netherlands, 1 July 2007 - 6 July 2007.
  • Conway A, Tomlinson RA & Jewell GW (2007) The development and application of magnetophotoelasticity. Proceedings of 13th International Conference on Experimental Mechanics. The Netherlands, 1 July 2007 - 6 July 2007.
  • Tomlinson RA, Yates JR & Zanganeh M (2007) Thermoelastic investigation of crack paths. Proceedings of the 13th International Conference on Experimental Mechanics. The Netherlands, 1 July 2007 - 6 July 2007.
  • Tomlinson RA, Yates J & Zanganeh M (2007) Investigation of interacting fatigue cracks using thermoelastic stress analysis. 8th International Conference on Multiaxial Fatigue & Fracture. Sheffield, 10 June 2007 - 14 June 2007.
  • Conway AR, Tomlinson RA & Jewell GW (2007) Improvements in the application of pulsed magnetophotoelasticity. Proceedings of the SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2007, Vol. 3 (pp 2006-2013)
  • Yang H, Tomlinson RA & Lionheart W (2006) Application of an Advanced Fourier Polarimetry in Tomographic Photoelasticity. Proceedings of Photomechanics 2006. Clermont-Ferrand, France, 10 July 2006 - 12 July 2006.
  • Marsavina L, Tomlinson RA, Patterson EA & Yates JR (2006) Investigation Of Crack Closure Using Thermoelastic Stress Analysis. Proceedings of the European Conference on Fracture 2006. Greece, 2 July 2006 - 4 July 2006.
  • Tomlinson RA, Yang H, Szotten D & Lionheart WRB (2006) The design and commissioning of a novel tomographic polariscope. Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006, Vol. 3 (pp 1141-1147)
  • Pacey MN & Tomlinson RA (2005) Complete two-dimensional principal stress separation by the photoelastic oblique incidence method. Applied Mechanics and Materials, Vol. 3-4 (pp 229-234)
  • Tomlinson RA & Calvert GC (2004) Industrial applications of thermoelastic stress analysis. Advances in Experimental Mechanics, Vol. 1-2 (pp 165-170)
  • Tomlinson RA, Greene RJ & Delaney KV (2000) The application of thermoelastic stress analysis to compressor vanes. PROCEEDINGS OF THE SEM IX INTERNATIONAL CONGRESS ON EXPERIMENTAL MECHANICS (pp 84-87)
  • Tomlinson RA & Yates JR (2000) An investigation of crack closure using thermoelasticity. PROCEEDINGS OF THE SEM IX INTERNATIONAL CONGRESS ON EXPERIMENTAL MECHANICS (pp 137-139)
  • Tomlinson RA & Patterson EA (1998) Evaluating characteristic parameters in integrated photoelasticity. EXPERIMENTAL MECHANICS, VOLS 1 AND 2 (pp 495-500)
  • Cen M, Tomlinson RA, Patterson EA & Hickman LJ (1998) Integrated birefringence applied to solids and fluids - A review. EXPERIMENTAL MECHANICS, VOLS 1 AND 2 (pp 507-512)