A Column-Type Experimental Device for Investigating Coupled Thermo-Hydro-Mechanical Behavior of Expansive Soils

2021 ◽  
Vol 44 (6) ◽  
pp. 20180192
Author(s):  
Abhishek Rawat ◽  
Wiebke Baille ◽  
Snehasis Tripathy ◽  
Tom Schanz
Keyword(s):  
Mechanical Behavior ◽  
Expansive Soils ◽  
Experimental Device ◽  
Column Type

scholarly journals The mechanical behavior of an expansive soil due to long-term seasonal rainfalls

2020 ◽  
Vol 195 ◽  
pp. 02019
Author(s):  
Kai LI ◽  
Liang Kong ◽  
Hossein Nowamooz ◽  
Cyrille Chazallon
Keyword(s):  
Mechanical Behavior ◽  
Expansive Soils ◽  
Expansive Soil ◽  
Direct Determination ◽  
Model Parameters ◽  
Continuous Change ◽  
Step Method ◽  
Steady Solutions ◽  
Unsaturated Expansive Soils

Expansive soils, susceptible to be affected by the environmental conditions, expand when water is added and shrink when they dry out. This continuous change in soil volume is able to cause structures built on them to move unevenly and crack. To investigate the hydro-mechanical behavior of unsaturated expansive soils, many laboratory tests on these materials have been carried on and numerous models have also been proposed with a relatively large number of parameters. In this study, a simplified model based on Zarka method has been developed for unsaturated expansive soils. The direct determination of the steady solutions in Zarka analysis is able to replace classic step-by-step method and needs less model parameters. In this context, this paper presents a Zarka-based model to predict the volume change in unsaturated expansive soils under seasonal drought and rainfall cycles and the proposed model is implemented in the finite element code to simulate long-term behavior of a 2D structure consisting of expansive soils and subjected to successive drought and rainfall cycles. Finally, the numerical calculation defines the plastic strain field and the inelastic displacement field of the studied structure.

Hydro-mechanical behavior of expansive soils with different dry densities over a wide suction range

2019 ◽  
Vol 15 (1) ◽  
pp. 265-278 ◽  
Author(s):  
Junran Zhang ◽  
Geng Niu ◽  
Xuchang Li ◽  
De’an Sun
Keyword(s):  
Mechanical Behavior ◽  
Expansive Soils

The effect of zeolite and cement stabilization on the mechanical behavior of expansive soils

2020 ◽  
pp. 121630
Author(s):  
Hamed Ahmadi Chenarboni ◽  
Seyed Hamid Lajevardi ◽  
Hossein MolaAbasi ◽  
Ehsanollah Zeighami
Keyword(s):  
Mechanical Behavior ◽  
Expansive Soils ◽  
Cement Stabilization

Development of an Experimental Device for Studying Real Connecting-Rod Bearings Functioning in Severe Conditions

2005 ◽  
Author(s):  
Philippe Michaud ◽  
Aurelian Fatu ◽  
Bernard Villechaise
Keyword(s):  
Mechanical Behavior ◽  
Fuel Consumption ◽  
Experimental Studies ◽  
Experimental Tests ◽  
Experimental Device ◽  
Connecting Rod ◽  
Real Environment ◽  
Great Complexity ◽  
Environmental Demands

Nowdays, automotive designers attempt to limit the pollution and the fuel consumption, in order to answer customer’s environmental demands. To assist designers in this effort, it is important to analyze and to understand engines bearing mechanical behavior. Therefore, many experimental studies have been undertaken in the last 20 years [1–3]. Because of the great complexity of the con-rod bearing real environment, no experimental tests have been realized in realistic and severe conditions. This paper presents an experimental device “MEGAPASCALE” made to analyze the thermoelastohydrodynamic (TEHD) behavior of connecting rod bearings functioning in severe conditions.

scholarly journals Work input analysis for soils with double porosity and application to the hydromechanical modeling of unsaturated expansive clays

2017 ◽  
Vol 54 (2) ◽  
pp. 173-187 ◽  
Author(s):  
Jian Li ◽  
Zhen-Yu Yin ◽  
Yujun Cui ◽  
Pierre-Yves Hicher
Keyword(s):  
Mechanical Behavior ◽  
Expansive Soils ◽  
Volumetric Strain ◽  
Double Porosity ◽  
Strain Increment ◽  
Degree Of Saturation ◽  
Triaxial Tests ◽  
Expansive Clay ◽  
Expansive Clays ◽  
Boom Clay

A mechanical approach for unsaturated expansive soils considering double porosity has been developed based on the porous media theory. In this approach, the adsorbed and the capillary water, as well as the micropores and macropores, are two distinct phases. An interaggregate stress considered as the work-conjugate of the macrostructural strain increment has been defined. Both physicochemical and capillary effects of the pore water have been introduced at the macroscopic level. Other work-conjugate variables relevant for the constitutive modeling of double-porosity unsaturated media have also been identified, consisting of the modified suction as conjugate of the increment of the macrostructural degree of saturation and the microstructural effective stress as conjugate of the microstructural volumetric strain increment. A hydromechanical model for unsaturated expansive clays taking into account the interaction between the micro- and the macrostructures in expansive clays can thus be built. Based on the bounding surface concept, an anisotropic loading – collapse yield surface has been introduced to reproduce the three-dimensional mechanical behavior. To analyze the model capabilities, two series of laboratory tests consisting of multiple wetting and drying cycle tests on Boom clay and triaxial tests on Zaoyang (ZY) expansive clay were simulated. The comparisons between numerical and experimental results show that the model can reproduce with reasonable accuracy the mechanical behavior and the water retention characteristic of unsaturated expansive clays.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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