OLLER  Sergio Horacio Cristobal
Numerical Simulation of Mechanical Behavior of Composite Materials
Springer International Publishing
Año: 2014 p. 229
This is a summary of the research work on "composite materials? carried out by the author since 1990.  It reflects my personal work with other researchers and also with senior engineering and PhD students whose thesis I have advised on this research line[1]. The subjects included in the present work are oriented mainly towards the constitutive modeling and structural evaluation of structures built with composite materials. Many of these subjects were and are still today original. Therefore, they do not represent a simple continuity of the research line trends of the past. All the concepts presented here are a summary of a more extensive work carried out by the author and other collaborators whose texts can be found in the references mentioned in each case.  It is worthwhile mentioning that all these subjects are still under development and require the additional participation and dedication of more people. This summary shows the subjects are not at the same conceptual and technical level. Some ideas are more developed than others, however, in general, all of them show that the numerical-mechanical study of composite materials is a very promising area for both, research work and industrial potential, and consequently to improve their use for the best interest of society. This research work started in 1990 and has progressed on two different research lines: the ?Mixing Theory? and its modifications and the ?Homogenization Theory? and its comprehensive study. Both lines have given way to a significant scientific production. The original objective of the research project was and is still today to design composite materials from their own components basic properties, without handling the composite as a single material.  This ?concern? has permanently pushed forward the research development and has opened the path towards the ?material design? suitable for each structure. The subject?s complexity and difficulty have demanded the intensive implementation of many techniques previously developed by the author in other research lines such as plasticity, anisotropy, introduction of rigid-body movements using the constitutive equation, local instability through a constitutive formulation, large strains, delamination problems, composites fatigue, etc. Simultaneously, a thorough data base and parallelization intensive computational work has been carried out. Moreover, a finite element code -PLCd[2]- has been developed and used as a ?development and testing tool? to implement these formulations. All this technology has been transferred to the COMET[3] program, which is a finite element code developed at CIMNE for more general purposes. Currently, research on composites is still under way and the temperature and humidity effects on the behavior have been included for a more comprehensive study of the matrix-fiber sliding phenomena. We are also trying to take these formulations to the structural finite elements, such as shells and membranes. This work has been possible thanks to the institutional support of CIMNE (International Center for Numerical method in Engineering), which has financially supported this book since its first edition in Spanish in 2003, and later in its English edition. In this latter task many people have participated, and particularly I thank Ms. Hamdy Briceño, Prof. Miguel Cerrolaza and Cristina Pérez Arias for their careful translation and revision of this text. I also thank all my students who have contributed to the correction of the text during the eleven years that this book has been used as a syllabus of "the Nonlinear Dynamics course" in the Department of Strength of Materials, of the Technical University of Catalonia, Spain. I hope these notes will contribute to a better understanding of the non-linear dynamics and encourage the reader to study this subject in greater depth.