Quantitative Detection of Contact Force Chains in a Model Particle Assembly Using Digital RGB Photoelastic Measurements
- 7 Downloads
This paper explains a newly developed technique for identifying particles belonging to the contact force chains in a model particle assembly. This was accomplished through digital image analysis of the color images obtained from photoelastic measurements. Descriptive statistics for RGB color intensities of pixels in a central square region inside the particle were digitally measured to determine the particle force, as opposed to the traditional method of counting fringe orders. The relationships between the descriptive statistics of the RGB color intensities and the applied forces were analyzed. The developed image analysis technique was applied to digital photoelastic images of an assembly of stacked particles. This technique could embed the numeric data of the particle forces in the digital photoelastic images which provide comprehensive information for a quantitative analysis of the progressive evolution of the soil arching phenomena in a particulate media.
KeywordsPhotoelasticity Granular assembly Particle Image analysis RGB color intensities
Unable to display preview. Download preview PDF.
This research was supported by an NST*-KICT† Postdoctoral Research Fellowship for Young Scientists from the Korea Institute of Civil Engineering and Building Technology in South Korea.
*National Research Council of Science & Technology / † Korea Institute of Civil Engineering and Building Technology
- Allesma HGB (1987) Optical analysis of stress and strain in photoelastic particle assemblies. PhD Thesis, Delft University of Technology, Delft, NederlandGoogle Scholar
- Byeon BH, Jung YH (2013) Measurement of stress and displacement fields in particle assembly subjected to shallow foundation loading via photoelasticity technique. Journal of the Korean Society of Civil Engineering 33:1947–1955, DOI: https://doi.org/10.12652/Ksce.2013.33.5.1947 CrossRefGoogle Scholar
- Frocht MM (1969) Photoelasticity: The selected scientific papers of MM Frocht. Pergamon, Oxford, UKGoogle Scholar
- Lesniewska D, Wood DM (2009) Observations of stresses and strains in a granular material. Journal of Engineering Mechanics 135(9):1038–1054, DOI: https://doi.org/10.1061/(ASCE)EM.1943-7889.0000015 CrossRefGoogle Scholar
- Muthuswamy M, Tordesillas A (2006). How do interparticle contact friction, packing density and degree of polydispersity affect force propagation in particulate assemblies? Journal of Statistical Mechanics: Theory and Experiment 2006(9):P09003, DOI: https://doi.org/10.1088/1742-5468/2006/09/P09003 CrossRefGoogle Scholar
- Shin SY, Jung YH, Kim TS (2016) Investigation of the change of soil arch structure in model particle assembly subjected to displacing trapdoor via photoelastic measurement technique. Journal of the Korean Geotechnical Society 32:31–40, DOI: https://doi.org/10.7843/kgs.2016.32.10.31 CrossRefGoogle Scholar
- Terzaghi K (1936) Stress distribution in dry and in saturated sand above a yielding trap-door. Proceedings of International Conference on Soil Mechanics and Foundation Engineering, June 22–26, Cambridge, MA, USA, 1936:307–311Google Scholar
- Vishay (2015) PhotoStress coating materials and adhesives. PhotoStress, Raleigh, NC, USAGoogle Scholar