Holm Altenbach Livres

This collection on "Mechanics of Generalized Continua" features contributions from leading scientists in France, Russia, and Germany, focusing on recent research, including new models, applications of existing models, micro-macro aspects, computational efforts, identification of constitutive equations, and unresolved classical continuum problems.

Focusing on practical computational simulation and analysis, this second part delves into creep modeling using constitutive equations for structural materials under multi-axial stress states. It builds on the foundational concepts established in the first part, applying these detailed equations to a variety of examples, providing essential insights for readers engaged in advanced engineering and materials science.

Focusing on the simulation and analysis of time-dependent stress and strain changes in engineering structures, this book explores creep mechanics in detail. It covers the formulation of constitutive equations for multi-axial stress states and applies structural mechanics models to various forms like beams and shells. Additionally, it reviews both classical and contemporary methods for modeling creep, aiming to enhance the existing solutions with sophisticated examples for structural analysis applications.

Classical plasticity theory of metals is independent of the hydrostatic pressure. However if the metal contains voids or pores or if the structure is composed of cells, this classical assumption is no more valid and the influence of the hydrostatic pressure must be incorporated in the constitutive description. Looking at the microlevel, metal plasticity is connected with the uniform planes of atoms organized with long-range order. Planes may slip past each other along their close-packed directions. The result is a permanent change of shape within the crystal and plastic deformation. The presence of dislocations increases the likelihood of planes slipping. Nowadays, the theory of pressure sensitive plasticity is successfully applied to many other important classes of materials (polymers, concrete, bones etc.) even if the phenomena on the micro-level are different to classical plasticity of metals. The theoretical background of this phenomenological approach based on observations on the macro-level is described in detail in this monograph and applied to a wide range of different important materials in the last part of this book.

This volume presents contributions describing the micro- and macro-behaviours, new existence and uniqueness theorems, the formulation of multi-scale problems, etc. and now it is time to ponder again the state of matter and to discuss new trends and applications. The main focus is directed on the following items - Modelling and simulation of materials with significant microstructure, - Generalized continua as a result of multi-scale models, - Multi-field actions on materials resulting in generalized material models, and - Comparison with discrete modelling approaches

This volume presents the major outcome of the IUTAM symposium on “Advanced Materials Modeling for Structures”. It discusses advances in high temperature materials research, and also to provides a discussion the new horizon of this fundamental field of applied mechanics. The topics cover a large domain of research but place a particular emphasis on multiscale approaches at several length scales applied to non linear and heterogeneous materials. Discussions of new approaches are emphasised from various related disciplines, including metal physics, micromechanics, mathematical and computational mechanics.

This book summarizes the actual state of the art and future trends of surface effects in solid mechanics. Surface effects are more and more important in the precise description of the behavior of advanced materials. One of the reasons for this is the well-known from the experiments fact that the mechanical properties are significantly influenced if the structural size is very small like, for example, nanostructures. In this book, various authors study the influence of surface effects in the elasticity, plasticity, viscoelasticity. In addition, the authors discuss all important different approaches to model such effects. These are based on various theoretical frameworks such as continuum theories or molecular modeling. The book also presents applications of the modeling approaches.

This monograph presents approaches to characterize inelastic behavior of materials and structures at high temperature. Starting from experimental observations, it discusses basic features of inelastic phenomena including creep, plasticity, relaxation, low cycle and thermal fatigue. The authors formulate constitutive equations to describe the inelastic response for the given states of stress and microstructure. They introduce evolution equations to capture hardening, recovery, softening, ageing and damage processes. Principles of continuum mechanics and thermodynamics are presented to provide a framework for the modeling materials behavior with the aim of structural analysis of high-temperature engineering components.

This book shows impressively how complex mathematical modeling of materials can be applied to technological problems. Top-class researchers present the theoretical approaches in modern mechanics and apply them to real-world problems in solid mechanics, creep, plasticity, fracture, impact, and friction. They show how they can be applied to technological challenges in various fields like aerospace technology, biological sciences and modern engineering materials.

Ziel des Buchs ist es, auf möglichst einfache Weise in die Grundlagen dieses anspruchsvollen Fachgebiets einzuführen. Gegliedert in Abschnitte zum historischen Abriss und zur Tensorrechnung, zu materialunabhängigen und zu materialabhängigen Gleichungen liegt der Schwerpunkt des Buchs bei festen deformierbaren Körpern. Viele Beispiele mit vollständigen Lösungen illustrieren den theoretischen Teil. Geeignet für Studierende im Bereich Maschinenbau und Bauingenieurwesens, Physik und Technomathematik sowie für Forscher und Praktiker in der Industrie.