Tire-soil interaction has a direct impact on tire performance, and is applicable in the modeling of heavy industrial equipment, farm machinery, and related off-road applications. The Coupled Eulerian-Lagrangian method is well suited for this application. This webinar demonstrates the use of Coupled Eulerian-Lagrangian (CEL) functionality in Abaqus for modeling tire-soil interaction. It includes:
- A discussion of the motivation for use of CEL for such applications
- A brief review of the modeling workflow in Abaqus for tires
- Material modeling and calibration guidelines for soil, focusing primarily on the Modified Drucker-Prager/Cap plasticity model. .
- An example tire-soil analysis setup
The webinar provides users with expert simulation advice and best practices for this application, developed by SIMULIA Industry engineers. The on-demand webinar can be accessed at the following link:
I have listed some supplementary information below on the topic that hopefully addresses some of the questions viewers of the webinar might have:.
- A set of input files that demonstrate the presented workflow is attached to this blog post. Also attached is the presentation in pdf form.
- Since tire analysis workflow often starts with an axisymmetric model followed by "symmetric model generation", the models are represented in the form of input decks, rather than Abaqus/CAE models. However, if the analysis sequence is completely done in Abaqus/Explicit starting with a 3D model, an associated Abaqus/CAE model database may exist.
- The eSeminar didn't cover the adaptive mesh refinement (AMR) option for the Eulerian soil domain in detail, but AMR is an option in order to reduce the analysis time, since it allows targeted automatic mesh refinement (and coarsening) of the Eulerian domain based on different criterion such as contact with Lagrangian surface, element volume fraction, plastic strain etc. See Section 14.1.4 "Defining adaptive mesh refinement in the Eulerian domain" of the Abaqus (2016) Analysis User's Guide for details.
- While it is not possible to incorporate density-dependence directly for the soil properties (such as elastic modulus), one can easily do that through field variable-dependent material properties where the field variable happens to be density that is computed as solution-dependent field variable inside the simple subroutine VUSDFLD. Within the routine, the volumetric plastic strain variable can be accessed for the material point which can be related to density in a straightforward manner.
- Mass scaling is not supported for Eulerian parts in the CEL analysis. However, one can always scale the material density to achieve similar effect as long as results are reviewed carefully to make sure accuracy is not affected by the change in inertia forces due to density scaling (similar to the precautions when using mass scaling). The soil constitutive behavior shouldn’t be affected since the cap plasticity model doesn’t have density as one of the parameters.
