Abstract
The discrete element method (DEM) is becoming increasingly popular for modeling the granular material. The determination of particle micro-parameters is an essential prerequisite for DEM simulations. Laboratory tri-axial compression test has often been used to calibrate particle micro-parameters for DEM simulations. However, the effect of end restraint in the conventional tri-axial test will bring about difficulty in calibrating the parameters accurately. To this end, a new computer-aided measurement method for tri-axial test, so called the whole surface deformation measurement (WSDM), is used to facilitate the parameter determination for DEM simulations. This method allows one to obtain the stress-strain and volumetric strain-strain responses of the central part of the specimen where the strain is proved to be uniform. The inter-particle sliding and rolling friction have been found to exhibit a cross effect on the macro responses of the specimen. This will cause much confusion in the calibration of the sliding and rolling friction coefficient. So a method based on contour graphs is proposed to determine the reasonable combination of the sliding and rolling friction coefficient. Keywords: DEM, micro-parameters, calibration, whole surface deformation measurement, cross effect
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Cheng, K., Wang, Y., Mo, YB., Yang, Q., Guo, Y. (2017). Determination of Micro-parameters in DEM Through the Whole Surface Deformation Measurement in the Tri-axial Test. In: Li, X., Feng, Y., Mustoe, G. (eds) Proceedings of the 7th International Conference on Discrete Element Methods. DEM 2016. Springer Proceedings in Physics, vol 188. Springer, Singapore. https://doi.org/10.1007/978-981-10-1926-5_147
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DOI: https://doi.org/10.1007/978-981-10-1926-5_147
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