31 May 2021 to 4 June 2021
Europe/Berlin timezone

Microstructural Evolution of Sand Assembly in Direct Shear Test: An Experimental Study using X-Ray Tomography

2 Jun 2021, 09:00
1h
Poster (+) Presentation (MS10) Advances in imaging porous media: techniques, software and case studies Poster +

Speaker

Mr Lalit Kandpal (Indian Institute of Technology, Delhi)

Description

The macroscopic mechanical behaviour of granular-porous media is largely influenced by kinematics of its micro-mechanical counterparts of particles and pores. Deformation at particle-level is not uniform across a granular sample but is localized along the directional force chain, thus forming shear intensive failure surface known as shear zone. This results in complex internal failure mode and therefore, judgements from surface deformations using digital imaging techniques may be misleading. With the aid of 3D imaging techniques, microscopic variation at the particulate level can be studied. This study presents the localized evolution of the microstructural particle and pore properties in sand assemblies with different particle sizes. Direct shear test is conducted on two sand specimens with different particle sizes inside an x-ray scanning environment. The scanned images at various stages of the tests are pre-processed using algorithms implemented in MATLAB. The micro-scale properties of particle and pore data [1] are extracted from each scanned image. For analysing the localized evolution of microstructure during shearing, the stacked data of both specimens are studied using SPAM [2]. The influence of particle size on the evolution of microstructural particle and pore properties and consequently on macroscopic response of the specimen is investigated in detail.

References

  1. Roy, N., & Frost, J. D. (2021). Characterizing the three-dimensional pore space architecture of granular materials. Under Review In Computers and Geotechnics
  2. Stamati et al., (2020). spam: Software for Practical Analysis of Materials. Journal of Open Source Software, 5(51), 2286, https://doi.org/10.21105/joss.02286
Time Block Preference Time Block A (09:00-12:00 CET)
Student Poster Award Yes, I would like to enter this submission into the student poster award
Acceptance of Terms and Conditions Click here to agree
Newsletter I do not want to receive the InterPore newsletter

Primary author

Mr Lalit Kandpal (Indian Institute of Technology, Delhi)

Co-authors

Anurag Gautam (Department of Civil Engineering, Indian Institute of Technology Dehli) Ms Nimisha Roy (Georgia Institute of Technology) Dr Satoshi Matsumura (Port and Airport Research Institute) Prof. Prashanth Vangla (Indian Institute of Technology Delhi) Prof. J. David Frost (Georgia Institute of Technology)

Presentation materials

There are no materials yet.