Upon the request of the International Union of Theoretical and Applied Mechanics (IUTAM) the Swedish National Committee for Mechanics organized a colloquium on fatigue, which was held at the Royal Institute of Technology (Kung!. Tekniska Hogskolan) in Stock holm, May 25-27, 1955. 35 lectures were delivered, principally dealing with problems of statistical and basic nature. Among the topics were to be found statis tical theory of fatigue, cumulative damage, mechanism of fatigue, me tallurgical aspects on fatigue, velocity of fatigue cracks, fatigue at elevated temperature, and fatigue at combined stresses. Lectures were going on simultaneously in two sections. Each lecturer had 15 minutes for presentation of his communication, and afterwards 15 minutes were reserved for discussion. Abstracts of the lectures were distributed about a month before the colloquium. The colloquium was attended by 149 participants from the follow ing countries: Denmark (1), Finland (2), France (5), Germany (6), Italy (2), Netherlands (2), Norway (2), Poland (2), Saar (1), Spain (3), Sweden (100), Switzerland (1), United Kingdom (10), USA (8), USSR (3), and Yugoslavia (1). A complete list of the participants will be found below. The languages of the Colloquium were English, French, German and Italian. No lectures were delivered in Italian. Also, all contributions to the discussions have been translated to one of the first three languages. Statements and opinions advanced are always those of the individual authors or participants in the discussions.

Inhalt
Sommaire Inhalt.- Étude critique de la notion de dommage appliquée à une classe étendue d?essais de fatigue.- Essais de fatigue statistiques suivant la méthode de charge progressive.- Contribution à I?étude de la fatigue des matériaux avec essais à charge progressive.- Theories relating to fatigue of materials under combinations of stress.- Effect of simultaneous cyclic variation of stress and tempe rature on a high temperature material.- Physical and statistical aspects of cumulative damage.- Ermüdungsfestigkeit bei statistisch veränderlichen Spannungsamplituden.- New statistical methods applied to the analysis of fatigue data..- Über Verformungserscheinungen in Stählen bei der Wechselbeanspruchung.- The effect of high loads on fatigue.- Modifications de texture cristalline produites par des efforts alternés.- Fatigue of steels at constant strain amplitude and elevated temperature;.- Une définition théorique de la limite de fatigue.- Effect of geometric size on notch fatigue.- Les travaux récents de l?Institut de Recherches Métallurgiques de Sarrebruck dans le domaine de la fatigue.- Einige Versuche über die Vorgänge in der Oberflächenschicht von Ermüdungsproben.- Essais de fatigue par flexion avec fréquences superposéas.- Ziele der Ermüdungsforsehung in der Schweiz, gezeigt am Beispiel von Dauerversuchen an Schraubenverbindungen.- Variability in fatigue testing: sources and effect on notch sensitivity.- Über den Meehanismus der Zerstörung bei der zyklischen Belastung von Metallen.- Torsion and tension relations for slip and fatigue.- Einige Besonderheiten der Kontaktermüdung.- Some observations on the propagation of fatigue cracks.- Some investigations on cumulative damage.- A guide to statistical methods for use in fatigue testing.-Die durch große Zug- und Druekermüdungsbelastungen hervorgebrachte mechanische Hysterese in Stählen.- Der Meehanismus des Dauerbruchs metallischer Werkstoffe.- A proposed mechanism of fatigue failure.- Recent researches on fatigue at the Mechanical Engineering Research Laboratory, East Kilbride.- Experimental design and methods of analysis used in studying effects of metallurgical variation on fatigue.- A contribution to the theory of the fatigue of metals.- Basic aspects of fatigue.- Ausscheidungsvorgänge in Stählen bei ruhender und wechselnder Beanspruchung.- Bending fatigue of large welded test pieces with regard to velocity of crack propagation.- Cumulative damage in fatigue.- Table des matières.