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原文传递 Comparison between a Terramechanics Model and a Continuum Soil Model Implemented within the Absolute Nodal Coordinate Formulation.

题名：	Comparison between a Terramechanics Model and a Continuum Soil Model Implemented within the Absolute Nodal Coordinate Formulation.
作者：	M. D. Letherwood; P. Jayakumar; G. Li; U. Contreras; C. D. Foster;
关键词：	algorithms, comparison, computations, continuum mechanics, coordinates, deformation, dynamics, estimates, finite element analysis, ground vehicles, integrated systems, interactions, interfaces, models
摘要：	In order to determine the best approach for the modeling of tracked vehicle-terrain interactions, a comparison is made between terramechanics and continuum mechanics plasticity soil models that can be used in vehicle dynamic simulations. The absolute nodal coordinate formulation (ANCF) which can be used in multibody system (MBS) dynamics to model large rotations and large deformations will provide a novel framework for this comparison. First, a brief review of the analytical derivation and implementation of a terramechanics soil model for drawbar pull-slip and pressure-sinkage are presented in order to establish the basic assumptions underlying this model. An assumed shape and mass for the vehicle-terrain interface and an empirically derived constitutive model are two clear assumptions inherent in terramechanics based approaches. The (modified) Bekker soil models are integrated finite element (FE) ANCF interpolations to determine the generalized forces. Continuum mechanics soil models that are suited for tracked vehicle-terrain interaction are identified and integrated into the internal force calculation of ANCF MBS algorithms. The paper discusses important fundamental issues that must be addressed when implementing continuum mechanics-based soil models as well as terramechanics models into MBS algorithms for modeling complex tracked vehicle/soil interactions. The improvement of the vehicle-terrain interface estimation resulting from FE methods can provide a terramechanics approach which may be scalable to differing vehicles and loadings. It is found that the assumed existence, uniqueness, and evolution of the yield surface(s) of continuum soil models play a critical role in predicting the soil behavior while also providing a rational method for improvement of soil constitutive modeling.
总页数：	10p
报告类型：	科技报告