[PDF] A Finite Element Based Continuum Damage Model For Mechanical Joints In Fiber Metal Laminates Under Static And Fatigue Loading eBook

Author : P.I. Kattan
Publisher : Springer Science & Business Media
Page : 116 pages
File Size : 27,21 MB
Release : 2012-12-06
Category : Science
ISBN : 3642563848

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The major goal of this book is to present the implementation of some damage models with finite elements. The damage models are based on the principles of continuum damage mechanics and the effective stress concept. Several books have appeared recently on damage mechanics but are mostly theoretical in nature. Alternatively, this book provides a complete finite element program that includes the effects of damage. The book consists of two parts. Part I includes two chapters mainly review ing topics from finite element analysis and continuum damage mechanics. The reader is cautioned that the material contained in this part is introductor- other references must be consulted for the theoretical aspects of these topics. For a complete theoretical treatment of the subject, the reader is referred to the book Advances in Damage Mechanics: Metals and Metal Matrix Composites by Voyiadjis and Kattan, published in 1999. In Part II the finite element program DNA is introduced in three chapters. DNA stands for "Da mage Nonlinear Analysis". The program can be used for the analysis of elasto plastic material behavior including the effects of damage within the frame work of damage mechanics. Two versions of DNA are presented - one for small strain analysis and one for finite strain analysis. The program makes extensive calls to a library of tensor operations developed by the authors. The tensor library is extensively outlined in the last chapter of the book.

Author : Antonio J.M. Ferreira
Publisher : Società Editrice Esculapio
Page : 212 pages
File Size : 38,20 MB
Release : 2016-08-01
Category : Technology & Engineering
ISBN : 8874889771

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Nowadays, it is quite easy to see various applications of fibrous composites, functionally graded materials, laminated composite, nano-structured reinforcement, morphing composites, in many engineering fields, such as aerospace, mechanical, naval and civil engineering. The increase in the use of composite structures in different engineering practices justify the present international meeting where researches from every part of the globe can share and discuss the recent advancements regarding the use of standard structural components within advanced applications such as buckling, vibrations, repair, reinforcements, concrete, composite laminated materials and more recent metamaterials. For this reason, the establishment of this 19th edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Porto (Portugal), selected plenary and keynote lectures have been collected in the present book.

Author : Shiguang Deng
Publisher :
Page : 129 pages
File Size : 11,19 MB
Release : 2012
Category : Composite materials
ISBN : 9781267648990

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Finite element modeling provides an efficient approach to simulate the mechanical behaviors of composite materials. Many finite element models were built to predict the mechanical responses of composite materials under the static loading conditions. Such static-loading models of composite materials were too modest to predict their behaviors under the dynamic loading process, say varying strain rates. In this thesis, we established both macromechanical and micromechanical finite element models to simulate the progressive damages of fiber reinforced composite materials under varying intermediate strain rates. With the application of the strain-rate-dependent composite properties, failure analysis and associated property degradations of failed composites, we were able to build a macromechanical finite element model to simulate the strain-rate-dependent mechanical behaviors of composite materials under intermediate strain rates. Through the comparison of our numerical results with experimental observations and modeling results reported in the literature, recommended values of mesh densities were presented and the correctness of our macromechanical mode was validated. The model was further developed with a multicontinuum theory (MCT). Based on the macromechanical model, a micromechanical model was developed to study the effects of a MCT-based constituent stress interactive failure criterion on the numerical results of a tensile test on a composite coupon with varying strain rates. The MCT is based on a constituent volume average procedure and was used to calculate the stress and strain states of every constituent within the composite. Based on the stress information of the constituents, associated failure criteria and degradation rules were presented for the model. By comparing the simulation results of the macromechanical and micromechanical models, we found some differences between them and further recommendations were given for modifying the present model to simulate the progressive damage dynamic responses of composite structures more precisely.

Author : O. Allix
Publisher : Elsevier
Page : 397 pages
File Size : 49,69 MB
Release : 2002-08-13
Category : Computers
ISBN : 0080545998

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Created in 1975, LMT-Cachan is a joint laboratory École Normale Superieure de Cachan, Pierre & Marie Curie (Paris 6) University and the French Research Council CNRS (Department of Engineering Sciences). The Year 2000 marked the 25th anniversary of LMT. On this occasion, a series of lectures was organized in Cachan in September-October, 2000. This publication contains peer-reviewed proceedings of these lectures and is aimed to present engineers and scientists with an overview of the latest developments in the field of damage mechanics. The formulation of damage models and their identification procedures were discussed for a variety of materials.

Author : Peter Amaya
Publisher :
Page : 239 pages
File Size : 21,45 MB
Release : 2012
Category :
ISBN :

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Abstract: A progressive damage and failure model is proposed for continuous fiber reinforced composite laminates under triaxial loading conditions. A literature review with emphasis on macromechanics based failure theories applied to composite laminates under static loading conditions shows that there is a need to validate failure models for composite laminates under triaxial loading conditions. Available experimental data show that the mechanical behavior and progressive damage of composite laminates may be different under multiaxial loading than under uniaxial loading conditions. The proposed failure model is an extension of the strain energy failure theory for triaxial loading conditions. The proposed strain energy model requires six parameters in order to predict the mechanical behavior and progressive damage of a composite laminate. Three material parameters are determined through laboratory tests involving unidirectional laminates subjected to multiaxial loading or multidirectional laminates subjected to uniaxial loading. The remaining three model parameters are used to represent unloading of failed lamina after initial failure has occurred. The proposed strain energy based failure theory and post initial-failure degradation model are combined with a stress field developed using either classical lamination theory or the finite element method using reduced integration quadratic hexahedral elements. The proposed failure model with classical lamination theory stress field gave adequate predictions compared with published experimental results for the initial failure, progressive damage, and final failure for tubular specimens under combined torsion and hydrostatic pressure as well as cylindrical dogbone specimens under combined uniaxial loading and hydrostatic pressure. The proposed failure model with the finite element stress field was able to adequately model stress concentrations near the free edges as well as predict initial, intermediate, and final failures for a cross-ply coupon under uniaxial extension as compared with experimental data. The validation of the proposed model suggests that it may be extended to predict the progressive damage and failure of composite laminate structures of complex geometries under complex loading conditions.