FEM simulation of viscous properties for granular materials considering the loading rate effect |
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Authors: | Fang-Le Peng Fu-Lin Li Yong Tan Warat Kongkitkul |
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Affiliation: | (1) Department of Geotechnical Engineering, HNTB, 11414 W. Park Place, Milwaukee, WI 53224, USA;(2) Research and Development, Virtual Product Development Division, Technology and Solutions Division, Caterpillar Inc., 14009 Old Galena Rd., Mossville, IL 61552, USA;(3) Department of Civil Engineering and Mechanics, University of Wisconsin at Milwaukee, 3200 North Cramer St., EMS W230, Milwaukee, WI 53201, USA |
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Abstract: | The deformation and strength characteristics of sandy soils as a kind of granular materials are very complex. The experimental
results show that when the strain rate suddenly changes in monotonic loading (ML) case, the stress–strain curve of sandy soils
changes sharply and then gradually converges into the original inferred one that would be obtained by continuous ML at constant
strain rate after having exhibited clear yielding. Similar behaviors are also observed when ML is restarted at a constant
strain rate following a creep loading or stress relaxation stage. An elasto-viscoplastic constitutive model for granular materials
is developed, which consists of three components. One of the most important features of the model is that it can take into
account the effects of loading rate due to viscous properties on the stress–strain behavior. The stress ratio-axial strain–time
relations from four drained plain strain compression (PSC) tests on the saturated Toyoura sand are successfully simulated
by the finite element method (FEM) code incorporating the proposed constitutive model. It is shown that the FEM code can simulate
the viscous behaviors of sand accurately under arbitrary loading history. |
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