Consolidation thermique par chaleur d'un sol non saturé

1991 ◽  
Vol 28 (1) ◽  
pp. 42-50 ◽  
Author(s):  
C. Saix
Keyword(s):  
Unsaturated Soil ◽  
Constitutive Law ◽  
Saturated Soils ◽  
Soil Consolidation ◽  
Thermal Compression ◽  
Triaxial Apparatus ◽  
Thermal Consolidation ◽  
Sol Non Saturé ◽  
Temperature Parameter ◽  
Definition Of

The thermal consolidation by heating of an unsaturated silty soil is studied by means of six tests performed in a thermal triaxial apparatus. The results show the importance of the temperature parameter and a clear similarity with the classical consolidation tests on saturated soils. A constitutive law is proposed for the thermal consolidation by heat that allows the definition of indices of thermal compression. This law is used to calculate the displacements in an unsaturated fill for heat storing. Key words: unsaturated soil, consolidation, heat, triaxial, modelling. [Translated by the Journal]

Appareil triaxial pour l'étude du comportement thermique dé sols non saturés

1990 ◽  
Vol 27 (1) ◽  
pp. 119-128 ◽  
Author(s):  
C. Saix ◽  
P. Jouanna
Keyword(s):  
Key Words ◽  
Unsaturated Soils ◽  
Saturated Soils ◽  
Clayey Soils ◽  
Triaxial Apparatus ◽  
State Of Stress ◽  
Thermal Consolidation ◽  
Mechanical Consolidation ◽  
Sols Non Saturés

The thermal consolidation of unsaturated soils in a thermo-hydro-mechanical framework is studied in a thermal triaxial apparatus described in the paper. The results of the first tests performed, under a given state of stress, on both silty and clayey soils, show some similarities between purely thermal consolidation and mechanical consolidation on saturated soils. Key words: unsaturated soils, temperature, triaxial, consolidation. [Journal translation]

A New Suction-Controlled True Triaxial Apparatus for Unsaturated Soil Testing

2020 ◽  
Vol 44 (4) ◽  
pp. 20190015
Author(s):  
Fang Zheng ◽  
Shengjun Shao ◽  
Yongxin Wang ◽  
Shuai Shao
Keyword(s):  
Unsaturated Soil ◽  
Soil Testing ◽  
True Triaxial ◽  
Triaxial Apparatus ◽  
True Triaxial Apparatus

Nonlinear models for design of circular RC columns under ultimate and service states

2021 ◽  
Author(s):  
Helena Barros ◽  
Carla Ferreira ◽  
Joaquim Figueiras ◽  
Mário Pimentel
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Models ◽  
Bending Moment ◽  
Constitutive Law ◽  
Equilibrium Equations ◽  
Linear Elastic ◽  
Compressive Stresses ◽  
Steel Bar ◽  
Tension And Compression ◽  
Definition Of

<p>The present paper is dedicated to the ultimate and to the service design of circular reinforced concrete sections under axial load and bending moment, according to Eurocode 2 [1].</p><p>The objective of the present work is to develop design equations for circular reinforced concrete sections, solving the equilibrium equations by mathematic symbolic software. The concrete only supports compressive stresses and the steel can hold both tension and compression. The nonlinear equation of EC2 [1] is used for compressed concrete in the ultimate design. The steel is considered to have a linear elastic constitutive law up to the yield stress, followed by a plastic behaviour. The ultimate design condition is posed in terms of maximum strains for the most compressed concrete fibre or for the tensioned steel bar, permitting the definition of interaction abacuses, shown in the present paper.</p>

Finite Element Analysis of the non Linear Behavior of a Multilayer Piezoelectric Actuator

2005 ◽  
Vol 881 ◽  
Author(s):  
M. Elhadrouz ◽  
T. Ben Zineb ◽  
E. Patoor
Keyword(s):  
Degrees Of Freedom ◽  
Constitutive Law ◽  
Element Analysis ◽  
Linear Behavior ◽  
Time Element ◽  
Non Linear ◽  
Multilayer Actuator ◽  
Element Type ◽  
Definition Of ◽  
The Right

AbstractA constitutive law for ferroelectric and ferroelastic piezoceramics is implemented in ABAQUS Standard using the subroutine user element. A linear solid element is defined: it is an eight-node hexahedron having the mechanical displacement components and the electric potential as degrees of freedom for each node. The element is formulated for static analysis and it needs the definition of the contribution of this element to the Jacobian (stiffness) and the definition of an array containing the contributions of this element to the right-hand-side vectors of the overall system of equations The subroutine is called for each element that is of a user-defined element type each time element calculations are required. As an example, the element is used for the simulation of a multilayer actuator made of piezoceramics. In this case, the piezoelectric equations are not valid since the electric loading induces non linear phenomena, which are captured through the constitutive law implemented in the user element.

3D Hyperelastic Constitutive Model for Yarn Behaviour Description

2012 ◽  
Vol 504-506 ◽  
pp. 267-272 ◽  
Author(s):  
Adrien Charmetant ◽  
Emmanuelle Vidal-Sallé ◽  
Philippe Boisse
Keyword(s):  
Longitudinal Shear ◽  
Constitutive Law ◽  
Energy Potential ◽  
Double Curvature ◽  
Axial Tension ◽  
Proposed Model ◽  
Tension And Compression ◽  
Bias Extension ◽  
Definition Of ◽  
Continuous Material

The preforming stage of the LCM composite manufacturing processes lead to fibrous reinforcement deformations which may be very large especially for double curvature shapes. Those deformations have significant influence on the second stage of the process, i.e. the injection of the resin. A way to predict accurately the spatial distribution of the permeability tensor consists in simulating for various configurations, the deformed shape of the reinforcement at the scale of the yarns. Mesoscopic scale analyses of textile reinforcements generally consider the yarns as a continuous material despite their fibrous nature. In order to have an accurate simulation tool, it is necessary to build up a constitutive law which accounts for the physical specificities linked to the microstructure of the yarns. Several models exist with reasonable accuracy. The present paper proposes a new approach in the hyperelasticity framework. The proposed model is based on the definition of mathematical invariants linked to the four main deformation modes of the yarn material: tension, compaction, longitudinal shear and transverse shear. The strain energy potential build up with those invariants is identified using classical fabric material tests: uni- and bi-axial tension and compression. The model has been validated on laboratory tests such as bias extension tests and gives promising results.

The Experimental Study of the Influence of the Matric Suction on the Unsaturated Soil Strength

2014 ◽  
Vol 580-583 ◽  
pp. 514-517 ◽  
Author(s):  
Cui Ran Liu
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Moisture Content ◽  
Unsaturated Soil ◽  
Matric Suction ◽  
Saturated Soil ◽  
Triaxial Apparatus ◽  
Soil Shear Strength ◽  
Soil Triaxial Apparatus ◽  
Water Contents

With modified unsaturated soil triaxial apparatus, unsaturated soil shear strength of the tests under the condition of different water contents are done. Experimental results show that the matric suction exist in unsaturated soil and increases with the decrease of moisture content. And the shear strength of unsaturated soil is higher than that of saturated soil. Shear strength of unsaturated soil varies as the matric suction and water content. The shear strength increases when the matric suction increases. when soil tend to be saturated, the matric suction will tend to be zero. And the shear strength of unsaturated soil values gradually close to the strength of the saturated soil.

Sign in / Sign up

Export Citation Format

Share Document