Mathematical modelling of weld phenomena 4 PDF

INTRODUCTION

This volume contains the papers presented at the fourth International Seminar 'Numerical Analysis of Weldability' held in September 1997 at Schlo Seggau near Graz, Austria. This conference, the fourth in a series of bi-annual meetings, was organised by the Institute of Materials Science and Welding Technology of the Technical University Graz and the working group 'Mathematical Modelling of Weld Phenomena' of Commission IX of the International Institute of Welding (IIW).

The geographical location of Graz ensures full international participation in a relaxing atmosphere which allows the free flow of ideas in the calm surroundings of an ancient castle in the Styrian province famous for its wine.

A central aim of this meetings is to publish articles which are written in sufficient depth and extent to be of use in the reproduction of the work and to serve as a learning aid to those who wish to join the subject. We are happy that once again, outstanding speakers in the field of Mathematical Modelling of Weld Phenomena and other associated disciplines accepted our invitation to add new topics to the set of proceedings published previously (Mathematical Modelling of Weld Phenomena, H. Cerjak and K.E. Easterling eds, The Institute of Materials, 1993; Mathematical Modelling of Weld Phenomena 2, H. Cerjak and H.K.D.H. Bhadeshia eds, The Institute of Materials, 1995 and Mathematical Modelling of Weld Phenomena 3, H. Cerjak and H.K.D.H. Bhadeshia eds, The Institute of Materials, 1997).

It is possible to recognise progress in practically all of the topics covered. The importance of fundamental research, its interdisciplinary nature and the cooperation across borders was clearly visible. Impressive lectures on the basics of fluid mechanics, solidification, new alloy design approaches, microstructure development, fast transformations, stress evolution and deformation were given. In addition to the 'traditional items' (heat flow, microstructure, development and residual stresses), an increasing interest in flow and solidification phenomena were noted. New approaches appeared, for example CIP-solver, flow characteristics during friction welding and the inherent strain concept. The dissemination of software and data via the MAP 'Materials Algorithms Project' via Internet was explained.

Further applicable software packages based on modelling approaches available for different applications and a successful application of (simplified) approaches to solve practical problems in the aircraft and nuclear industries were presented. The modelling of weld phenomena is no longer a 'computer game', but a methodology which is serving the community rather well. This is probably why many young, talented and enthusiastic scientists continue to be attracted to the meeting.

We would like to thank the local organisers in Graz who made all the visitors welcome and who are now preparing the 5th International Seminar to be held in October 1999. A special thanks is given to Bernhard Schaffernak who was not only in charge of the local organisation of the event but also of organising the papers for this publication. As ever Peter Danckwerts and his team and the Institute of Materials, who unanimously support our ideas have done again a marvellous job in producing this publication, a job we truly appreciate.

Finally we would like to thank all those who have participated in this interesting and challenging project by putting their ideas and results down on paper.

Edited by: H. Cerjak, H.K.D.H. Bhadeshia