Opening and Closing Lectures. Bifurcations and singularities in mathematics and mechanics (V.I. Arnold). The Pendulum, from Huygens' Horologium to symmetry breaking and chaos (J.W. Miles). Introductory Lectures of Minisymposia. MECHANICS OF LARGE DEFORMATION AND DAMAGE. Phenomenological aspects of continuum damage mechanics (J.L. Chaboche). Computational micromechanics (A. Needleman). Plasticity and creep at finite strains (V. Tvergaard). THE DYNAMICS OF TWO-PHASE FLOW. A brief guide to two-phase flow (G.K. Batchelor). Fluidisation of solid particles (J.F. Davidson). Flow of bubbly liquids (L. Van Wijngaarden). MECHANICS OF THE EARTH'S CRUST. Fluid driven fractures (D.A. Spence). Fractal applications to complex crustal problems (D.L. Turcotte). Sectional Lectures. Bifurcations and modal interactions in fluid mechanics: surface waves (J.P. Gollub, F. Simonelli). Active vibration damping in large flexible structures (P. Hagedorn). Numerical simulation of turbulence (J.R. Herring, R.M. Kerr). Turbulence and vortices in rotating fluids (E.J. Hopfinger). Mechanisms of toughening in ceramics (J.W. Hutchinson). Multiphase flow in explosive volcanic and geothermal eruptions (S.W. Kieffer). Separation bubbles (M. Kiya). Flow of granular materials (S.B. Savage). Interactions in boundary-layer transition (F.T. Smith). Stochastic modelling of fatigue accumulation (K. Sobczyk). Non-linear aspects of delamination in structural members (B. Storakers, B. Andersson). Some physical aspects associated with cavitation (J.H.J. Van Der Meulen). Some problems of mechanics in tectonic analysis (R. Wang). Contributed Papers. List of Contributed Papers presented at the Congress. Alphabetical list of topics - Contributed papers & Minisymposia.