This volume contains the lectures presented at the mini-symposium on "Micromechanics" held in conjunction with the CSME Mechanical Engineer­ ing Forum 1990 between the 3rd and 8th June, 1990 at the University of Toronto, Canada. The expressed purpose of this symposium was to discuss some recent developments in the Micromechanics of Materials and how ad­ vances in this field now relate to the solution of practical engineer­ ing problems. Due to the time limit set for this section of the Engineer­ ing Forum as well as the restriction on the number of papers to be pre­ sented, it was not possible to cover a much wider range of topics. How­ ever, an attempt was made to include the most important advances asso­ ciated with the progress made in micromechanics in its application to material science and engineering over the past decade. Thus, the topics are concerned with: the fundamental aspects of the thermodynamics of structured solids (part I), - the micromechanical behaviour of alloys (part II), - the modelling of the material behaviour on the basis of continuum theory (part III), and finally the important new approach to the characterization of various mate­ rials and their responses to external agencies by the use of proba­ bilistic micromechanics (part IV). We would like to take this opportunity to thank the Chairman of the Organizing Committee, Prof. F. P. J. Rimrott, and the President of the CSME, Prof. T. S.

I. Thermodynamics of Materials.- 1. Non-Equilibrium Thermal/Mechanical Behaviour.- 2. Internal Variables in Non-Equilibrium Thermodynamics.- 3. Evaporation in Porous Media.- II. Micromechanics of Alloys.- 1. Micro-Macro and Meso Mechanics of Alloys with Shape Memory.- 2. Nonlinear Localized Effects in Micromechanics.- 3. Micromechanics of Conductive Polymeric Materials.- 4. Large Elasto-Plastic Deformation of Two-Phase Alloys - Structural Continuous Model.- III. Micro-Continuum Mechanics.- 1. Micromechanical Modelling and Computation of Shakedown with Nonlinear Kinematic Hardening - Including Examples for 2D-Problems.- 2. New Variational Principles in Heterogeneous Elasticity Derived by Lagrange's Multiplier Method.- 3. A Constitutive Model for Cyclic Inelastic Deformation of Solids.- IV. Stochastic and Experimental Micromechanics.- 1. Stochastic Flow Dynamics of Polymer Melts.- 2. Microstructure and the Fatigue Reliability of Metals.- 3. The Measurement of Microdeformations in Structured Solids.- 4. Micro-Rheology of Multi-Phase System: An Experimental Assessment.- Closure.