Classical and Improved Theories

In this chapter, the theoretical background for two commonly used structural theories for the modelling and analysis of laminates and sandwiches is considered, namely the classical laminate theory and the first-order shear deformation theory. The classica

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Springer-Verlag Berlin Heidelberg GmbH

H. Altenbach . 1. Altenbach . W. Kissing

Mechanics of Composite Structural Elements

With 123 Figures and 23 Tables

,

Springer

Prof. Dr.-Ing. habil. Holm Altenbach Professur Technische Mechanik Martin-Luther-Universität Halle- Wittenberg FB Ingenieurwissenschaften 06099 Halle (Saale), Germany Prof. Dr.-Ing . habil. Dr. h.c. Johannes Altenbach F örderstedter Str. 28 39112 Magdeburg, Germ any Prof. Dr.-Ing. habil. Wolfgang Kissing Professur Technische Mechanik/Festigkeitslehre Hochschule Wismar FB Maschinenbau/Verfahrens- und Umwelttechnik Philipp-Müller-Straße 23966 Wismar, Germany

ISBN 978-3-642-07411-0

ISBN 978-3-662-08589-9 (eBook)

DOI 10. 1007/978-3-662-08589-9 DOI 10.1007/978-3-662-08589-9

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© Springer-Verlag Berlin Heidelberg 2004 Originallypublishedby Springer-Verlag Berlin Heidelberg New Yorkin 2004 . Softcoverreprint of the hardcover 1st edition 2004 The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Typesetting: Dataconversion by authors Cover-design: deblik, Berlin Printed on acid-free paper 62 / 3020 hu - 5 4 3 2 1 0

Preface

Laminate and sandwich structures are typical lightweight elements with rapidly expanding application in various industrial fields. In the past, these structures were used primarily in aircraft and aerospace industries. Now, they have also found application in civil and mechanical engineering, in the automotive industry, in shipbuilding, the sport goods industries, etc. The advantages that these materials have over traditional materials like metals and their alloys are the relatively high specific strength properties (the ratio strength to density, etc). In addition, the laminate and sandwich structures provide good vibration and noise protection, thermal insulation, etc. There are also disadvantage s - for example, composite laminates are brittle, and the joining of such element s is not as easy as with classical materials. The recycling of these materials is also problematic,