The general objective of the Tenth Canadian Fracture Conference was to respond to progress in the engineering sciences - in particular with r- pect to rapidly developing new trends in the theory and methodology of researcr and designing - and to the resulting needs of practical engineering in the specific field of fracture mechanics and related areas of engineering mechanics. The basic underlying issue is the theory and practice of physical analytical and iconic (reduced) modelling of the actually involved physical processes and of the responses of physical bodies and systems to actual energy flow - a problem which is becoming dominant in all fields of the natural sciences. Accordingly, the theme of the CFCIO was "Modelling Problems in Crack Tip Mechanics", a well defined and limited subject, the scope of treatment of which can be as deep and as comprehensive as an in­ volved researcher wishes it to be.

I - General Lectures (Invited).- Some Finite Elasticity Problems Involving Crack-Tips.- Advanced Experimental Methods in Crack Tip Mechanics.- Lifetime Prediction for Metallic Structural Components Subjected to Loading with Varying Intensity.- The State of Affairs Near the Crack Tip.- Mathematical Modelling of Ductile and Time-dependent Fracture.- II - Particular Basic Problems Session (Invited).- Nonlocal Stress Fields of Dislocations and Crack.- The Micromechanics of Fatigue Crack Initiation.- Mechanics of Nonlinear Crack Growth: Effects of Specimen Size and Loading Step.- III - Session Papers.- Strain Rate Dependence of Fracture Toughness JIc and Ductility.- A Numerical Investigation of Crack Tip Parameters in Creeping Solids.- Fatigue Crack Closure Analysis and Crack Propagation Estimation.- Determining Stress Intensity Factors for Running Cracks.- Experimental Mechanics and Modelling of Fatigue Crack Growth.- Crack-Tip Growth Rate Model for Cyclic Loading.- A Stochastic Approach to the Growth and Coalescence of Microvoids in a Ductile Solid.- On the Influence of High Stress Gradients on Light Propagation in the Neighbourhood of Crack Tips.- On the Three Dimensional J Integral Evaluation in the Inelastic and Transient Stress Fields.- Analysis of Models of Stress States in the Regions of Cracks Using Isodyne Photoelasticity.- A Calibration Technique for the D.C. Potential Drop Method of Monitoring Three Dimensional Crack Growth.- Ductile Failure of High Toughness Line Pipe Containing Circumferential Defects.- On the Development of a Mixed Mode Tensile-Shear Interlaminar Fracture Criterion for Graphite-Epoxy Composites.- The Influence of Non-Singular Stresses on Experimental Measurements of the Stress Intensity Factor.- Measurement of Near Tip Fields Near theRight Angle Intersection of Straight Front Cracks with Free Surfaces.- Plastic Collapse Stresses of Plates with Surface Grooves.- Transient Strain Fields of Ductile Fracture of a Centrally Cracked Aluminium Sheet.- Authors' Index.