An intergranular strain concept for material models formulated as rate equations. (6th February 2020)

• Record Type: Journal Article
• Authors: Bode, Manuel; Fellin, Wolfgang; Mašín, David; Medicus, Gertraud; Ostermann, Alexander
• Is Part Of: International journal for numerical and analytical methods in geomechanics. Volume 44:Number 7(2020)
• Page Start: 1003
• Page End: 1018
• Publication Date: 2020-02-06
• Subjects: barodesy -- hypoplasticity -- small‐strain -- reloading -- soil cyclic behaviour; Soil mechanics -- Mathematics -- Periodicals; Rock mechanics -- Mathematics -- Periodicals; 624.1510151
• DOI: 10.1002/nag.3043
• Languages: English
• ISSNs: 0363-9061

Abstract

Summary: The intergranular strain concept was originally developed to capture the small‐strain behaviour of the soil with hypoplastic models. A change of the deformation direction leads to an increase of the material stiffness. To obtain elastic behaviour for smallstrains, only the elastic part of the material stiffness matrix is used. Two different approaches for an application of this concept to nonhypoplastic models are presented in this article. These approaches differ in the determination of the elastic stress response, which is used for reversible deformations. The first approach determines an elastic response from the original material model, and the second one uses an additional elastic model. Both approaches are applied on barodesy. The simulations are compared with experimental results and with simulations using hypoplastic models with the original intergranular strain concept.