Dr Francois Guillard

PhD Aix-Marseille University (France)
Lecturer in Geotechnical Engineering
Particles and Grains Laboratory
School of Civil Engineering

J05 - J05 Civil Engineering Building
The University of Sydney

Telephone +61 2 9351 2134

Website School of Civil Engineering

SciGEM

Particles and Grains Laboratory

Curriculum vitae Curriculum vitae

Research interests

Granular materials such as sand and snow have the ability to behave both as solids (in sand dunes and snowdrifts) and as fluids (in hourglasses and avalanches). Dr François Guillard studies the properties and behaviours of granular materials and of brittle porous media, which have implications for industries including construction, mining, agriculture and pharmaceuticals.

"Granular materials are present everywhere in nature and in industry, but they exhibit extremely complex and rich behaviours that we don't yet fully understand. For example, no one knows quite how sandcastles hold together, how we can walk on sand or snow, or what happens inside a box of cereal.

"My research focuses particularly on the behaviour of granular materials when they are flowing, and how they transition between this behaviour and their solid state.

"I'm also studying how brittle porous media - such as rocks and sandstone, snow, volcanic ashes and even bones - behave under load and chemical degradation. I use puffed rice grains as a model material, for example, which can be brittle when dry but become soft and mushy when they stay too long in a liquid such as milk. These principles are of tremendous importance for both natural and artificial brittle porous materials that are compacted under load and soaked in water.

"In addition, I am involved in advancing the technology used to study granular materials. Currently we cannot see the behaviour of the grains below the surface, so I am developing X-ray radiography methods to study in real time and in three dimensions how granular materials flow internally.

"A better understanding of the properties and behaviours of such materials, combined with better experimental investigation techniques, can improve the safety and efficiency of numerous industrial processes, including the construction industry's use of sand, concrete and composite materials; the mining industry's methods of ore extraction and processing; the agricultural industry's storage, transport and processing of cereal grains; and the pharmaceutical industry's bulk handling and delivery of drugs in powdered form.

"I've been working in this field since 2010, and I joined the University of Sydney in 2013. Working here has greatly broadened my research interests and afforded me more direct access to the practical implications of my research. It also provides access to state-of-the-art infrastructure and facilities, which is of tremendous help in developing and addressing my research questions."

Selected publications

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Journals

  • Jiang, S., Shen, L., Guillard, F., Einav, I. (2018). Energy dissipation from two-glass-bead chains under impact. International Journal of Impact Engineering, 114, 160-168. [More Information]
  • Nadler, B., Guillard, F., Einav, I. (2018). Kinematic Model of Transient Shape-Induced Anisotropy in Dense Granular Flow. Physical Review Letters, 120(19), 198003-1-198003-5. [More Information]
  • Jiang, S., Shen, L., Guillard, F., Einav, I. (2018). The effect of inter-grain contact material on the dynamic fracture of short glass bead chains under impact. Powder Technology, 339, 911-921. [More Information]
  • Einav, I., Guillard, F. (2018). Tracking time with ricequakes in partially soaked brittle porous media. Science Advances, 4(10). [More Information]
  • Guillard, F., Marks, B., Einav, I. (2017). Dynamic X-ray radiography reveals particle size and shape orientation fields during granular flow. Scientific Reports, 7, 1-11. [More Information]
  • Valdes, J., Guillard, F., Einav, I. (2017). Evidence That Strain-Rate Softening Is Not Necessary for Material Instability Patterns. Physical Review Letters, 119(11), 1-5. [More Information]
  • Wyburn, E., Guillard, F., Marks, B., Einav, I. (2017). The behaviour of free-flowing granular intruders. EPJ Web of Conferences, 140, 1-4. [More Information]
  • Guillard, F., Forterre, Y., Pouliquen, O. (2016). Scaling laws for segregation forces in dense sheared granular flows. Journal of Fluid Mechanics, 807, 1-11. [More Information]
  • Liu, D., Shen, L., Guillard, F., Einav, I. (2016). Transition failure stress in a chain of brittle elastic beads under impact. International Journal of Impact Engineering, 93, 222-230. [More Information]
  • Guillard, F., Golshan, P., Shen, L., Valdes, J., Einav, I. (2015). Dynamic patterns of compaction in brittle porous media. Nature Physics, 11(10), 835-838. [More Information]
  • Guillard, F., Forterre, Y., Pouliquen, O. (2013). Depth-Independent Drag Force Induced by Stirring in Granular Media. Physical Review Letters, 110(13), 138303-1-138303-5. [More Information]

Conferences

  • Guillard, F., Golshan, P., Shen, L., Valdes, J., Einav, I. (2017). Compaction dynamics of crunchy granular material. Powders and Grains 2017 - 8th International Conference on Micromechanics on Granular Media, Les Ulis, France: EDP Sciences. [More Information]
  • Liu, S., Guillard, F., Marks, B., Rognon, P., Einav, I. (2017). Experimental study of shear rate dependence in perpetually sheared granular matter. Powders and Grains 2017 - 8th International Conference on Micromechanics on Granular Media, Les Ulis, France: EDP Sciences. [More Information]
  • Hossain, I., Guillard, F., Einav, I. (2017). Multicomponent tensile buckling. 24th Australasian Conference on the Mechanics of Structures and Materials (ACMSM24), London: Taylor & Francis Group.
  • Marks, B., Guillard, F., Einav, I. (2016). High speed X-ray imaging of particulate flows. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
  • Wyburn, E., Marks, B., Guillard, F., Rognon, P., Einav, I. (2016). Particle shape effects on flowability of powder mixtures. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
  • Guillard, F., Marks, B., Einav, I. (2016). Velocity measurement of granular flows using dynamic X-ray radiography. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
  • Guillard, F., Pouliquen, O., Forterre, Y. (2011). Forces experienced by an object moving in granular medium. The 20th French Mechanics Congress 2011, France.
  • Fabre, B., Guillard, F., Solomon, M., Blanc, F., Sidorenkov, V. (2010). Structuring music in recorder playing: a hydrodynamical analysis of blowing control parameters. International Symposium on Music Acoustics (ISMA) 2010, Sydney, Australia: Curran Associates, Inc.

2018

  • Jiang, S., Shen, L., Guillard, F., Einav, I. (2018). Energy dissipation from two-glass-bead chains under impact. International Journal of Impact Engineering, 114, 160-168. [More Information]
  • Nadler, B., Guillard, F., Einav, I. (2018). Kinematic Model of Transient Shape-Induced Anisotropy in Dense Granular Flow. Physical Review Letters, 120(19), 198003-1-198003-5. [More Information]
  • Jiang, S., Shen, L., Guillard, F., Einav, I. (2018). The effect of inter-grain contact material on the dynamic fracture of short glass bead chains under impact. Powder Technology, 339, 911-921. [More Information]
  • Einav, I., Guillard, F. (2018). Tracking time with ricequakes in partially soaked brittle porous media. Science Advances, 4(10). [More Information]

2017

  • Guillard, F., Golshan, P., Shen, L., Valdes, J., Einav, I. (2017). Compaction dynamics of crunchy granular material. Powders and Grains 2017 - 8th International Conference on Micromechanics on Granular Media, Les Ulis, France: EDP Sciences. [More Information]
  • Guillard, F., Marks, B., Einav, I. (2017). Dynamic X-ray radiography reveals particle size and shape orientation fields during granular flow. Scientific Reports, 7, 1-11. [More Information]
  • Valdes, J., Guillard, F., Einav, I. (2017). Evidence That Strain-Rate Softening Is Not Necessary for Material Instability Patterns. Physical Review Letters, 119(11), 1-5. [More Information]
  • Liu, S., Guillard, F., Marks, B., Rognon, P., Einav, I. (2017). Experimental study of shear rate dependence in perpetually sheared granular matter. Powders and Grains 2017 - 8th International Conference on Micromechanics on Granular Media, Les Ulis, France: EDP Sciences. [More Information]
  • Hossain, I., Guillard, F., Einav, I. (2017). Multicomponent tensile buckling. 24th Australasian Conference on the Mechanics of Structures and Materials (ACMSM24), London: Taylor & Francis Group.
  • Wyburn, E., Guillard, F., Marks, B., Einav, I. (2017). The behaviour of free-flowing granular intruders. EPJ Web of Conferences, 140, 1-4. [More Information]

2016

  • Marks, B., Guillard, F., Einav, I. (2016). High speed X-ray imaging of particulate flows. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
  • Wyburn, E., Marks, B., Guillard, F., Rognon, P., Einav, I. (2016). Particle shape effects on flowability of powder mixtures. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.
  • Guillard, F., Forterre, Y., Pouliquen, O. (2016). Scaling laws for segregation forces in dense sheared granular flows. Journal of Fluid Mechanics, 807, 1-11. [More Information]
  • Liu, D., Shen, L., Guillard, F., Einav, I. (2016). Transition failure stress in a chain of brittle elastic beads under impact. International Journal of Impact Engineering, 93, 222-230. [More Information]
  • Guillard, F., Marks, B., Einav, I. (2016). Velocity measurement of granular flows using dynamic X-ray radiography. The 12th International Conference on Bulk Materials Storage, Handling and Transportation (ICBMH 2016), Barton, ACT: Engineers Australia.

2015

  • Guillard, F., Golshan, P., Shen, L., Valdes, J., Einav, I. (2015). Dynamic patterns of compaction in brittle porous media. Nature Physics, 11(10), 835-838. [More Information]

2013

  • Guillard, F., Forterre, Y., Pouliquen, O. (2013). Depth-Independent Drag Force Induced by Stirring in Granular Media. Physical Review Letters, 110(13), 138303-1-138303-5. [More Information]

2011

  • Guillard, F., Pouliquen, O., Forterre, Y. (2011). Forces experienced by an object moving in granular medium. The 20th French Mechanics Congress 2011, France.

2010

  • Fabre, B., Guillard, F., Solomon, M., Blanc, F., Sidorenkov, V. (2010). Structuring music in recorder playing: a hydrodynamical analysis of blowing control parameters. International Symposium on Music Acoustics (ISMA) 2010, Sydney, Australia: Curran Associates, Inc.

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