In 1978, the European Mechanics Committee and the French Centre National de la Recherche Scientifique agreed to the organization of an Interna­ tional Colloquium on the "Mechanical Behavior of Anisotropic Solids". The meeting was held at Villard-de-Lans (near Grenoble, France) from 19th to 22 nd June 1979. The Colloquium considered mechanical aspects of the anisotropy of solids, both initial and induced by permanent deformation, anisotropic hardening and damage, oriented fissuration, etc. Topics concerned mathematical, experimental and engineering aspects of the anisotropy of metals, composites, soils and rocks. The aim of the Colloquium was to bring together experimentalists, theoretecians and engineers interested in various features of mechanical anisotropy, in order to permit an interdisciplinary exchange of understanding, experience and methods. A detailed description of the scope, aim and proposed topics is contained in the Preface. The announcement of the Colloquium attracted a large number of sub­ mitted contributions. Conforming with the principles of Euromech Colloquia and of the Colloques Internationaux du CNRS, the accepted contributions were limited to 50 communications. A general description of the scientific program is to be found in the Preface. Five general lectures gave state-of-the-art reports concerning some areas of the behavior of anisotropic solids; the 50 communications were divided into 12 sessions dealing with specific topics (see "Contents"). In order to facilitate subsequent contact between the reader and the contributors, full addresses are given in the "List of Authors".

- Sommaire.- Session 1 Invariant Formulation of Constitutive Equations Formulation/Invariante des Lois de Comportement.- General Lecture; Conférence Générale.- The Formulation of Constitutive Equations for Anisotropic Solids.- Communications.- Anisotropic Constitutive Expressions.- On the Structure of Anisotropic Tensor Functions in Continua.- Symmetry Relations for Anisotropic Materials.- Theory of Invariants in Creep Mechanics of Anisotropic Materials.- Description of Deformation and Fracture of Anisotropic Solids.- Les Invariants des Tenseurs d'Ordre 4 du Type de l'Elasticité.- Session 2 Physical Properties of Anisotropic Materials/Propriétés Physiques des Matériaux Anisotropes.- Communications.- L'Anisotropic Magnétique: un Moyen de Caractérisation des Matériaux.- Birefringence in Finitely-Deformed Materials.- State Functions for a Pseudoelastic Body.- Anisotropies and Elasticity in Liquid Crystals.- Aspects Théoriques et Expérimentaux des Equations d'Etat d'Origine Elastique de Solides Anisotropes.- The Formation Factor Tensor in Relation to Structural Characteristics of Anisotropic Granular Soils.- Session 3 Changes of Macroscopic Anisotropy in Metals, Evolution de l'Anisotropic Macroscopique des Métau.- General Lecture; Conférence Générale.- Experimental Plasticity on the Anisotropy of Metals.- Communications.- A Rule of Anisotropic Hardening with Taking into Account Preliminary and Actual Plastic Deformations and Strain Rates.- Plastic Behaviours of Initially Anisotropic Metals after Multi Prestrainings.- Anistropic Behaviour at Cyclic Plastic Deformation.- On Changes of Anisotropy during Thermo-Mechanical Processes.- Session 4 Anisotropy of Metallic Polycrystals/Anisotropic des Polycristaux Métalliques.- General Lecture; ConférenceGénérale.- Relations entre Textures et Comportement Mécanique Anisotrope des métaux.- Communications.- Etude de l'Anisotropic Elastique, Plastique et Géométrique dans les Polycristaux Métalliques.- Anistropie de Comportement Plastique de Tôles d'Aluminium et de Titane Possédant une Texture Cristallographique.- Dynamic Plastic Deformation for Non-Proportional Loading Paths.- Session 5 Analytical and Numerical Methods for the Determination of Mechanical Properties of Composites/Méthodes Analytiques et Numériques pour la Détermination des Propriétés Mécaniques des Composites.- General Lecture; Conférence Générale.- Mechanical Properties of Composites.- Communications.- Analysis of the Effects of Fiber Anisotropy on the Properties of Carbon and Graphite Fiber Composites.- Elasto-Plastic Theory of Composites with Regular Internal Structure.- Finite Strip Method for the Analysis of Visco-Elastic Two-Dimensional Structures.- Session 6 Strength of Composites/Résistance des Composites.- Communications.- Strenght Ratios of Orthotropic Materials.- Failure Criteria for Unidirectional Fiber-Reinforced Composites under Confining Pressure.- Delamination and Interlaminar Strength of Graphite/Epoxy Laminates.- Session 7 Mechanics of Anisotropic Rocks/Mécanique des Roches Anisotropes.- General Lecture; Conférence Générale.- Anisotropie Mécanique des Roches.- Communications.- Modélisation de l'Anisotropie par un Complexe Stratifié de Corps Isotropes. Application au Comportement au-delà de la Limite Elastique.- Slip, Dilation and Closure of Joints in a Regularly Jointed Rock Mass.- Comportement Mécanique d'une Roche Anisotrope Thermiquement Fissurée.- Session 8 Anisotropy of Consolidated Clays and of Materials with Internal Friction/Anisotropie desArgiles Consolidées et des Matériaux à Frottement Interne.- Communications.- Anisotropic Consolidation of Initially Isotropic Soil.- Description of Anisotropic Consolidation of Clays.- A Generalized Failure Condition for Orthotopic Solids.- Cisaillement Positif, Négatif et Neutre.- Session 9 Vibrations, Waves' Propagation and Induced Anisotropy/Vibrations, Propagation des Ondes et Anisotropie Induite.- Communications.- On the Problem of Oscillations of the Anisotropic Electroconductive Plates in the Magnetic Field.- On Deformational Anistropy.- Anisotropie Induite par les Fissures dans les Roches sous Contrainte: Modules Elastiques Effectifs et Atténuation.- Electroacoustic Waves in Elastic Ferroelectrics.- Microfissuration du Béton et Propagation d'Ondes Ultrasonores.- Session 10 Damage and Creep/Endommagement et Fluage.- Communications.- Le Concept de Contrainte Effective Appliqué à l'Elasticité et à la Viscoplasticité en Présence d'un Endommagement Anisotrope.- Damage Induced Elastic Anisotropy.- Creep Characterization of Eutectic Composites.- Relations entre la Vitesse du Fluage de la Glace Polycristalline et la Texture Cristalline.- Session 11 Experimental Investigations and Interpretation of Mechanical Tests/Recherches Expérimentales et Interprétation des Essais Mécaniques.- Communications.- On a Continuum Approach to Plastic Anisotropy of Perforated Materials.- Apparatus Effects in the Determination of Strength Variation in Anisotropic Rock.- The Experimental Behavior of Anisotropic Clay.- Saint-Venant's Principle in Anisotropic Elasticity Theory.- Interprétation d'Essais de Traction, de Flexion Trois Points et de Dilatométrie de Plaques Stratifiées Epoxy/Carbone.- Session 12 Problems of Civil Engineering/Problèmes de GénieCivil.- Communications.- Engineering Problems Caused by the Anisotropic Behaviour of the Rock Mass.- Theory of Explosions in Anisotropic Media.- Axisymmetric Loads on a Semi-Infinite Transversely Isotropic Body.