Engineering Damage Mechanics - J. Lemaitre, R. Desmorat (Springer, 2005) WW.pdf - Dokumenty - djokupolska

Engineering Damage Mechanics

Jean Lemaitre Rodrigue Desmorat

Engineering

Damage Mechanics

Ductile, Creep, Fatigue and Brittle Failures

With 135 Figures

123

Professor Jean Lemaitre

Professor Rodrigue Desmorat

Universite Paris 6

L.M.T. Cachan

61, Av. du Président Wilson

94230 Cachan, France

ISBN 3-540-21503-4 Springer Berlin Heidelberg New York

Library of Congress Control Number: 2004111141

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Foreword

The analysis of stress and deformation of structures and components is not an

end in itself. The aim is to predict the serviceability, reliability, and manu-

facturability of both existing structures and components and of proposed

designs. In order to make such assessments, the mode (or modes) of failure

need to be known and accounted for. The damage can take many forms, e.g.,

cracks, voids, chemical attack. In any case, the result is deterioration of the

structure or component. Predicting the implications of that deterioration for

mechanical integrity is the goal of damage mechanics.

The concept of damage and the realization of its importance for engineer-

ing are not new. What is relatively new (within the last 35 years or so) is

the development of the framework of Continuum Damage Mechanics. There

have been many contributors to this development, but the contributions of

the French school and particularly those of Jean Lemaitre stand out. The

ﬁeld of damage mechanics has advanced to the point where it is an engineer-

ing tool, with wide applications in industry. In practice, needs arise at several

levels. In a preliminary design stage, the need is often for rapid methods of

analysis that exhibit trends. In a ﬁnal design stage or in carrying out a safety

assessment the need can be for accurate quantitative predictions. This book

provides formulations that span such a range for a variety of technologically

important modes of failure, providing a perspective on the advantages and

disadvantages of various approaches – from uncoupled, post-processing anal-

yses to fully coupled damage analyses.

After introductory chapters on Continuum Damage Mechanics and nu-

merical analysis of damage, the remaining chapters focus on a mode of dam-

age – ductile failures; low-cycle fatigue; creep, creep-fatigue and dynamic

failures; high-cycle fatigue; and failure of brittle and quasi-brittle materials.

Each of these chapters appropriately begins with a section on engineering

considerations to set the stage and provides a guide to analysis methods and

tools. It is quite remarkable that such a wide range of behaviors are incor-

porated within a uniﬁed presentation. The damage mechanics “apple” has

blossomed into a tree with many branches!

Foreword

Since failure is a complex nonlinear process, the predicted behavior can

be sensitive to parameter values. Their appropriate identiﬁcation is key for

reliable engineering predictions, as is understanding the sensitivity of predic-

tions to the particular choice of parameter values. The presentation here pays

attention to parameter sensitivity as well as to parameter identiﬁcation.

This book provides a comprehensive guide to Engineering Damage Me-

chanics. It should appeal to all engineers and students of engineering con-

cerned with lifetime prediction and with the failure resistant design of struc-

tures, components, and processes.

Brown University, USA

Alan Need leman

Engineering Damage Mechanics - J. Lemaitre, R. Desmorat (Springer, 2005) WW.pdf

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