The Symposium was initiated in 1977 by Dr. M. G. CHABERT, Directeur des plans et programmes du C. E. T. I. M. His death, which occurred a few weeks before the Symposium, was deeply felt by all participants, who decided to dedicate this volume to his memory. The purpose, as set out by Dr. CHABERT, was to bring together people speaking the language of research and the language of industry in discussing problems of structural analysis. The Centre Technique des Industries M~caniques (C. E. T. I. M. ) at Sen1is was considered a suitable place for organizing such a meeting. Modern structural analysis, aided by high speed computers, is mainly concerned with non-linear phenomena, such as plasticity, visco-plasticity, damage and fracture mecha­ nics. Scientists involved in research in this field also speak two different languages: that of material analysts and that of structural analysts. The Bureau of IUTAM had appointed the following Scientific Committee to implement the ideas proposed by Dr. CHABERT: J. LEMAITRE, Universite Paris VI, ENSET, Cachan, France Chairman J. HULT, Chalmers University of Technology, Gothenburg, Sweden, Co-Chairman G. CHABERT, Centre Technique des Industries M~caniques, Sen1is, France F. A. LECKIE, University of Illinois, Urbana, Illinois, USA G. MAIER, Istituto di Scienza e Technica delle Costruzi­ oni, Po1otechnico di Milano, Italy Z. MROZ, Polish Academy of Sciences, Warsaw, Poland G. S.

Préambule inaugural.- Numerical Techniques for the Finite Element Analysis of Elastic and Inelastic Material Nonlinearities.- Elastic-Plastic Fracture Mechanics of Cantilever Beam Specimen.- A Procedure for Including Damage in Constitutive Equations for Elastic-Viscoplastic Work-Hardening Materials.- The Use of Statistical Reference Stress Techniques in Nonlinear Structural Analysis.- Analyse d'une Structure Elastoplastique Soumise à un Chargement Cyclique.- Discussion on Problems of Models Identification.- Strain Hardening Effects and Damage in Plastic Fatigue.- The Concept and Application of the Bounding Surface in Plasticity Theory.- Deflexions of Elastic-Plastic Beams at Finite Spread of Plastic Zones.- Axial Strain in Cyclic Torsion.- Effect of Physical Nonlinearities on Optimal Design of Structures.- A Comparison of the Plastic Buckling Behaviour of 2:1 Ellipsoidal and 2:1 Torispherical Shells Subjected to Internal Pressure.- Shakedown of Plates under Moving Patch Loads.- Comportement Asymptotique des Structures Elastoplastiques sous Chargement Periodique.- A Constitutive Modelling of Time-Dependent Plastic Material with Work-Hardening and Recovery Effects.- Limit Analysis of Prefabricated Large Panel Buildings by the Use of Discrete Models.- Inelastic Constitutive Equations and Phenomenological Laws of Damage Accumulation for Structural Metals.- The Yield Condition of Crystalline Solids.- Tensorial Nature of Damage Measuring Internal Variables.- On the Effect of Physical Non-Linearities in the Aeroelastic Stability Problem of Supersonic Panels.- Plasticity and Ultimate Strength of Concrete.- An Internal Variable Approach to the Formulation of Finite Element Problems in Plasticity.- Sur la Consolidation Post-Fluage des Materiaux Metalliques Soumis à unEtirement Progressif.- The Use of an Empirical Yield Surface Model in Predicting Shakedown Loads.- Plasticity Solutions by Finite Element Method.- About the Periodic Contact Problem for the Maxwell Body.- Dynamic Analysis of Structural Problems with Strong Physical Non-Linearities Described by Superpotentials.- A Quadratic Approximation of a Non-Linear Structural Design Problem.- Calculation of Viscoelastic Response.- Calcul par Elements Finis de l'Evolution d'une Inclusion dans une Matrice Deformee Uniformement.- Creep and Plastic Ratchetting in Cyclically Thermally Loaded Structures.- Une Formulation par la Methode des Elements Finis d'Analyse Dynamique Non-Lineaire Appliquee aux Systemes Tridimensionelles de Poutres et de Tuyaux.- Prediction of Concrete Behaviour Using a Non-Linear Incremental Law.- Description of Anisotropic Damage Application to Elasticity.- Mixed Work-Hardening Law for Steels under Complex Loading Histories and its Application to Finite Element Analysis.- Incremental Analysis of Elasto-Plastic Shells of Revolution and its Application to Practical Design.- Neutral and Shakedown-Type Domains for Axisymmetric Plates and Shells under Cycles of Pressure and Temperature.- Accuracy of Numerical Solutions of Problems Involving Physical Non-Linearities.- Physical and Phenomenological Model with Non-Linearity in Ductile Fracture and Fatigue Crack Growth.