E-Book Overview
This book concerns the development of novel finite elements for the structural analysis of composite beams and blades. The introduction of material damping is also an important aspect of composite structures and it is presented here in terms of their static and dynamic behavior. The book thoroughly presents a new shear beam finite element, which entails new blade section mechanics, capable of predicting structural blade coupling due to composite coupling and/or internal section geometry. Theoretical background is further expanded towards the inclusion of nonlinear structural blade models and damping mechanics for composite structures. The models effectively include geometrically nonlinear terms due to large displacements and rotations, improve the modeling accuracy of very large flexible blades, and enable the modeling of rotational stiffening and buckling, as well as, nonlinear structural coupling. Validation simulations on specimen level study the geometric nonlinearities effect on the modal frequencies and damping values of composite strips of various angle-ply laminations under either tensile or buckling loading. A series of correlation cases between numerical predictions and experimental measurements give credence to the developed nonlinear beam finite element models and underline the essential role of new nonlinear damping and stiffness terms.
E-Book Content
RESEARCH TOPICS IN WIND ENERGY 1 Dimitrios I. Chortis Structural Analysis of Composite Wind Turbine Blades Nonlinear Mechanics and Finite Element Models with Material Damping 123 Research Topics in Wind Energy Volume 1 Series Editor Joachim Peinke For further volumes: http://www.springer.com/series/11859 Dimitrios I. Chortis Structural Analysis of Composite Wind Turbine Blades Nonlinear Mechanics and Finite Element Models with Material Damping ABC Dimitrios I. Chortis Department of Mechanical Engineering and Aeronautics Structural Analysis and Active Materials Group Applied Mechanics Laboratory University of Patras Patras Greece ISSN 2196-7806 ISBN 978-3-319-00863-9 DOI 10.1007/978-3-319-00864-6 ISSN 2196-7814 (electronic) ISBN 978-3-319-00864-6 (eBook) Springer Cham Heidelberg New York Dordrecht London Library of Congress Control Number: 2013941372 c Springer International Publishing Switzerland 2013 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law. The use of general descriptive names, registered names, trademarks, service marks, 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. While the advice and information in this book are believed to be true and accura