Calibration of a Discrete Element Model for Dry Sand and Fine Grain Soil for Use in Vehicle Mobility Applications
Abstract
In this paper, a procedure for calibration of a discrete element (DE) computational soil model for use in prediction of ground vehicle mobility is presented. The procedure relies on using the results of two physical soil experiments: (1) hydrostatic compression; and (2) unconfined shear strength under different levels of normal stress and normal pre-stress. The hydrostatic compression test is used to calibrate the DE bulk density, plastic strain, and elastic strain as a function of hydrostatic stress. The unconfined shear strength test is used to calibrate the DE inter-particle friction coefficient and adhesion stress as a function of the soil plastic strain. The test devices and experimental test procedures are presented in the paper. The DE model calibration procedure is demonstrated in the paper using two types of soil: dry sand-silt and dry silt-clay. The model is then validated by comparing the models results to experimental confined shear strength test results, pressure - sinkage results for circular disks and cones, as well as single tire drawbar pull results for those two types of soil.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 07, 2022
- Accession Number
- AD1162745
Entities
People
- Ashwin Gaonkar
- Hazim El-mounayri
- Omar Elmaraghi
- Omkar Ghije
- Paramsothy Jayakumar
- Srinivas Sanikommu
- Tamer Wasfy