Hypoplastic Interface Model considering Plane Strain Condition and Surface Roughness

Yong-Gwang Jong,Pieride Mabe Fogang,Yang Liu,Zixuan Chen,Chaohui Wang

doi:10.1155/2021/1473181

Abstract

The soil-structure interface problem is an important part of soil-structure interaction research. These problems are mostly three-dimensional space problems, which is more complex to solve. In this paper, reduced stress and strain rate vectors are incorporated into the explicitly granular hypoplastic model by considering the plane strain state precisely. In addition, considering the important influence of roughness on the mechanical properties of contact surface, an improved hypoplastic model is established by incorporating the influence of roughness into the hypoplastic model, and the applicability of the new improved model is validated by comparing with the simulation results of the Mohr–Coulomb model, the explicitly granular hypoplastic models, and the experimental data. The results indicate that the improved model can be utilized to reflect the nonlinearity of the mechanical properties of the contact surface, which is in good agreement with the experimental data.

Highlights

E research methods for the interface problems mentioned above are reviewed from the aspect of macromechanics
Based on the molecular dynamic modeling, Ghaffari et al [29] carried out micronumerical simulations of mechanical properties of lubricant-sliding solids interface to study the effects of temperature and n-alkanes on the mechanical response of contact surface
Based on the existing granular hypoplastic model [14], in this paper, a new improved model has been developed by taking into account the relative surface roughness

Summary

Simulation Method

E roughness R is defined as the relative height between the highest peak and the lowest along a profile of structure surface. The structural surface consisted of regular triangular asperities in the numerical simulation. Each regular triangle is an isosceles triangle and is exactly the same to each other; it contains two geometric parameters: the asperity height (R) and the asperity width (w). In this test, the width was set at 2 mm and height (roughness) was set according to the condition of experiment and simulation. We use the frictional subroutine (FRIC keyword in ABAQUS) to compile the new model into the FRIC subroutine; the aim is to simulate the mechanical property of the contact surface

Soil Structure

Results

Jacobian matrix

Glass sand