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This book provides a comprehensive introduction to numerical modeling of size effects in metal plasticity. The main classes of strain gradient plasticity formulations are described and efficiently implemented in the context of the finite element method. A robust numerical framework is presented and employed to investigate the role of strain gradients on structural integrity assessment. The results obtained reveal the need of incorporating the influence on geometrically necessary dislocations in the modeling of various damage mechanisms. Large gradients of plastic strain increase dislocation density, promoting strain hardening and elevating crack tip stresses. This stress elevation is quantified under both infinitesimal and finite deformation theories, rationalizing the experimental observation of cleavage fracture in the presence of significant plastic flow. Gradient-enhanced modeling of crack growth resistance, hydrogen diffusion and environmentally assisted cracking highlighted the relevance of an appropriate characterization of the mechanical response at the small scales involved in crack tip deformation. Particularly promising predictions are attained in the field of hydrogen embrittlement. The research has been conducted at the Universities of Cambridge, Oviedo, Luxembourg, and the Technical University of Denmark, in a collaborative effort to understand, model and optimize the mechanical response of engineering materials.
El Mexico envenenado de odios sera un Mexico de burocratas aprovechadores e ineficientes que, convencidos de la imposibilidad de hacer nada efectivo, se lanzan a la voragine de la corrupcion y la apatia. Un hombre desmoralizado es un protagonista de mordidas y delincuencia. Es la torpeza y el desgano. El Mexico grande esta entre su misma gente, si desmonta la trampa afectiva que le han tendido los militares del odio. El Mexico optimista e industrioso es el que puede pensar que su pasado indigena y espanol es plataforma y no lastre. El Mexico grandioso dejara de ser un sueno cuando los mexicanos, todos, sientan orgullo de ese pasado. Este es un libro escrito por muchos autores y realizado por muchos personajes. Es la tarea de autores al encuentro con la historia. El libro tiene el doble papel de ensayo y obra de texto. Como ensayo intenta analizar la formacion del pueblo de Mexico, la creacion de la nacionalidad mexicana. Como obra de textotoma en cuenta la investigacion historica de muchos autores y narra los hechos fundamentales.
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