Nom : JONGCHANSITTO
Prénom : Pawarut
Laboratoire de thèse : Institut Pascal (UBP/IFMA/CNRS UMR 6602) et Department of Mechanical
Engineering (Chiang Mai University, Thailand) – Co-tutelle
Directeur de thèse : Prof. Xavier Balandraud, Prof. Michel Grédiac et Prof. Ittichai Preechawuttipong
Date de la soutenance : 28 août 2015
Nom des personnes composant le jury :
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Rapporteur 1 : Supasit RODKWAN, Asst. Professor, Department of Mechanical Engineering, Kasetart
University (THAILAND)
Rapporteur 2 : Farhang RADJAI, Directeur de Recherche, LMGC, Université Montpellier 2 (FRANCE)
Directeur de thèse 1 : Xavier BALANDRAUD, Professeur, Institut Français de Mécanique Avancée,
Institut Pascal (FRANCE)
Directeur de thèse 2 : Michel GREDIAC, Professeur, Université Blaise Pascal, Institut Pascal
(FRANCE)
Directeur de thèse 3 : Ittichai PREECHAWUTTIPONG, Professeur, Department of Mechanical
Engineering, Chiang Mai University (THAILAND)
Somchai PATTANA, Asst. Professor, Department of Mechanical Engineering, Chiang Mai University
(THAILAND)
Wetchayan RANGSRI, Dr. HDR, Department of Mechanical Engineering, Chiang Mai University
(THAILAND)
Titre de thèse : Mechanical analysis of 2D composite granular materials: thermomechanical experiments
and numerical simulations
Résumé de la thèse : The main objective of the research work is to analyze the mechanical behavior of twodimensional composite granular materials without cohesion through the granular textures. Thermoelastic
stress analysis experiments and molecular dynamics simulations are used for this purpose. The composite
granular systems are prepared from polyoxymethylene (POM) and high-density polyethylene (HDPE)
cylinders with a stiffness ratio of about four between them. Several configurations with difference in term
of ratio of diameter size and ratio of particle number are systematically investigated. Experimental and
numerical results are quite good correlated in overview. In particular the strong network, which is here
characterized by stresses higher than the mean value, exhibits an exponential decay and consists of less
than 50% of all particles whatever the type of particles considered for the analysis (soft, stiff, or both
types). In addition, the contact distributions between the stiff particles (POM particles) is anisotropic with
an effort to arrange parallel to the direction of the external applied load, whereas the other types of
contacts just act to sustain the granular system in equilibrium.