scholarly journals A constitutive model for the accumulated strain of unsaturated soil under high‐cycle traffic loading

2021 ◽  
Author(s):  
Zhigang Cao ◽  
Jingyu Chen ◽  
Eduardo E. Alonso ◽  
Anna Ramon Tarragona ◽  
Yuanqiang Cai ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Unsaturated Soil ◽  
Traffic Loading ◽  
Accumulated Strain

scholarly journals Numerical Implementation of a Hydro-Mechanical Coupling Constitutive Model for Unsaturated Soil Considering the Effect of Micro-Pore Structure

2021 ◽  
Vol 11 (12) ◽  
pp. 5368
Author(s):  
Guoqing Cai ◽  
Bowen Han ◽  
Mengzi Li ◽  
Kenan Di ◽  
Yi Liu ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Mechanical Behavior ◽  
Pore Structure ◽  
Unsaturated Soil ◽  
Fortran Program ◽  
Numerical Implementation ◽  
Numerical Application ◽  
Integration Algorithm ◽  
Mechanical Coupling ◽  
Numerical Program

An unsaturated soil constitutive model considering the influence of microscopic pore structure can more accurately describe the hydraulic–mechanical behavior of unsaturated soil, but its numerical implementation is more complicated. Based on the fully implicit Euler backward integration algorithm, the ABAQUS software is used to develop the established hydro-mechanical coupling constitutive model for unsaturated soil, considering the influence of micro-pore structure, and a new User-defined Material Mechanical Behavior (UMAT) subroutine is established to realize the numerical application of the proposed model. The developed numerical program is used to simulate the drying/wetting cycle process of the standard triaxial specimen. The simulation results are basically consistent with those calculated by the Fortran program, which verifies the rationality of the developed numerical program.

scholarly journals A finite element method based on modified Alonso unsaturated soil constitutive model

2021 ◽  
Vol 692 (4) ◽  
pp. 042034
Author(s):  
Zecheng Chi ◽  
Zhaowei Meng ◽  
Linyu Xie ◽  
Wei Wang ◽  
Weipeng Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Constitutive Model ◽  
Unsaturated Soil ◽  
Element Method

Volume–mass unsaturated soil constitutive model for drying–wetting under isotropic loading–unloading conditions

2011 ◽  
Vol 48 (2) ◽  
pp. 280-313 ◽  
Author(s):  
Hung Q. Pham ◽  
Delwyn G. Fredlund
Keyword(s):  
Constitutive Model ◽  
Unsaturated Soil ◽  
Unsaturated Soils ◽  
Characteristic Curve ◽  
Research Literature ◽  
Degree Of Saturation ◽  
Soil Conditions ◽  
Constitutive Relationships ◽  
Proposed Model ◽  
Wide Range

A rigorous volume–mass constitutive model is proposed for the representation of drying–wetting under isotropic loading–unloading conditions for unsaturated soils. The proposed model utilizes concepts arising from soil physics and geotechnical engineering research and requires readily obtainable soils data for soil properties. The model can be used to predict void ratio and water content constitutive relationships (and therefore degree of saturation) for a wide range of unsaturated soils. Various stress paths (i.e., loading–unloading and drying–wetting) can be simulated, and hysteresis associated with the soil-water characteristic curve is taken into account. Two closed-form equations for the volume–mass constitutive relationships are presented for soils starting from slurry conditions. A number of test results (i.e., from experimental programs reported in the research literature) were used during the verification of the proposed volume–mass constitutive model. The volume–mass constitutive model captures key unsaturated soil conditions such as air-entry value, water-entry value, and residual conditions. The proposed model appears to satisfactorily predict unsaturated soil behavior for soils ranging from low compressible sands to high compressible clays.

Banking simulation with a constitutive model for unsaturated soil

2010 ◽  
pp. 1337-1342 ◽  
Author(s):  
M Tanaka ◽  
K Kawai ◽  
S Kanazawa ◽  
A Iizuka ◽  
S Tachibana ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Unsaturated Soil

A unified constitutive model for unsaturated soil under monotonic and cyclic loading

2018 ◽  
Vol 14 (2) ◽  
pp. 313-328 ◽  
Author(s):  
Yong-lin Xiong ◽  
Guan-lin Ye ◽  
Yi Xie ◽  
Bin Ye ◽  
Sheng Zhang ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Constitutive Model ◽  
Unsaturated Soil

scholarly journals Application of an Incremental Constitutive Model for the FE Analysis of Material Dynamic Restoration in the Rotary Tube Piercing Process

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4289
Author(s):  
Alberto Murillo-Marrodán ◽  
Eduardo García ◽  
Jon Barco ◽  
Fernando Cortés
Keyword(s):  
Constitutive Model ◽  
Material Flow ◽  
Twist Angle ◽  
State Parameter ◽  
Material Model ◽  
Fe Analysis ◽  
Incremental Model ◽  
Mathematical Expressions ◽  
Accumulated Strain ◽  
Tube Piercing Process

In the numerical simulation of hot forming processes, the correct description of material flow stress is very important for the accuracy of the results. For complex manufacturing processes, such as the rotary tube piercing (RTP), constitutive laws based on both power and exponential mathematical expressions are commonly used due to its inherent simplicity, despite the limitations that this approach involves, namely, the use of accumulated strain as a state parameter. In this paper, a constitutive model of the P91 steel derived from the evolution of dislocation density with strain, which takes into account the mechanisms of dynamic recovery (DRV) and dynamic recrystallization (DRX), is proposed for the finite element (FE) analysis of the RTP process. The material model is developed in an incremental manner to allow its implementation in the FE code FORGE®. The success of this implementation is confirmed by the good correlation between results of the simulation and experimental measurements of the manufactured tube (elongation, twist angle, mean wall thickness and eccentricity). In addition, this incremental model allows addressing how the restoring mechanisms of DRV and DRV occur during the RTP process. The analysis puts into evidence that DRV and DRX prevail over each other cyclically, following an alternating sequence during the material processing, due mainly to the effect of the strain rate on the material.

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