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Author : Jean Salençon
Publisher : Unknown
Page : 207 pages
File Size : 45,9 Mb
Release : 2019
Category : Structural analysis (Engineering)
ISBN : 1523128585
Author : Jean Salençon
Publisher : John Wiley & Sons
Page : 145 pages
File Size : 46,6 Mb
Release : 2019-04-29
Category : Technology & Engineering
ISBN : 9781119618355
The theory of viscoelasticity has been built up as a mechanical framework for modeling important aspects of the delayed behavior of a wide range of materials. This book, primarily intended for civil and mechanical engineering students, is devoted specifically to linear viscoelastic behavior within the small perturbation framework. The fundamental concepts of viscoelastic behavior are first presented from the phenomenological viewpoint of the basic creep and relaxation tests within the simple one-dimensional framework. The linearity and non-ageing hypotheses are introduced successively, with the corresponding expressions of the constitutive law in the form of Boltzmann’s integral operators and Riemann’s convolution products respectively. Applications to simple quasi-static processes underline the dramatic and potentially catastrophic consequences of not taking viscoelastic delayed behavior properly into account at the design stage. Within the three-dimensional continuum framework, the linear viscoelastic constitutive equation is written using compact mathematical notations and takes material symmetries into account. The general analysis of quasi-static linear viscoelastic processes enhances similarities with, and differences from, their elastic counterparts. Simple typical case studies illustrate the importance of an in-depth physical understanding of the problem at hand prior to its mathematical analysis.
Author : Aleksey D. Drozdov
Publisher : Academic Press
Page : 596 pages
File Size : 54,7 Mb
Release : 1998-02-09
Category : Science
ISBN : 008054360X
Viscoelastic Structures covers the four basic problems in the mechanics of viscoelastic solids and structural members: construction of constitutive models for the description of thermoviscoelastic behavior of polymers; mathematical modeling of manufacturing advanced composite materials; optimal-design of structural members and technological processes of their fabrication; and stability analysis for thin-walled structural members driven by time-varying loads. This book familiarizes the reader with state-of-the-art mathematical models for advanced materials and processes, and demonstrates their applications in modeling and simulating specific manufacturing processes. Viscoelastic Structures also demonstrates the effects of material, geometrical, and technological parameters on the characteristic features of viscoelastic structures. 1Presents state-of-the-art mathematical models and methods which serve for the analysis of advanced technological processes 1Includes numerous examples to demonstrate theory which have not been included in previous literature 1Employs one consistent, user-friendly method to study a number of technological processes 1Features unique approach to aging materials 1Appendices cover background material on tensor calculus, kinematics with finite strains, stochastic differential equations, and evolutionary equations with operator coefficients
Author : Guillermo J. Creus
Publisher : Springer Science & Business Media
Page : 177 pages
File Size : 40,5 Mb
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 9783642826863
This book contains notes for a one-semester graduate course which is an introduction to the study of viscoelasticity and creep of concrete. Emphasis was set on the conceptual aspects rather than on the mathematical or computational refinements. The mathematical structure of viscoelasticity is discussed with some care because it clarifies the basic concepts and has important consequences in computa tional applications. Basic ideas are exemplified using the simplest problems and constitutive models in order to be able to show complete solutions. In the computational applications we have also chosen to present the sim plest situations with the greatest possible detail. It has been the author's experience that once the basic concepts are well understood the students are able to follow the rest of the course more easily and to accede to more advanced literature and applications. Chapters I to III furnish the foundations for the course, that may be expanded in diverse ways. If we are interested in finite elements applications we should look at Chapter IV and then go direct ly to Chapter VII. If we are interested in the simplified analysis of frame structures we should study Chapter VI in detail. Chapter V re views the viscoelastic behavior of concrete and Chapter VIII studies the problem of creep buckling. At the end of each chapter we give se lected references to works that complete and extend the subject matter.
Author : Konstantin Naumenko,Holm Altenbach
Publisher : Springer
Page : 210 pages
File Size : 46,9 Mb
Release : 2019-06-01
Category : Science
ISBN : 9783030203818
This second part of the work on creep modeling offers readers essential guidance on practical computational simulation and analysis. Drawing on constitutive equations for creep in structural materials under multi-axial stress states, it applies these equations, which are developed in detail in part 1 of the work, to a diverse range of examples.
Author : Claudio Modena,P.B. Lourenço,P. Roca
Publisher : CRC Press
Page : 758 pages
File Size : 45,8 Mb
Release : 2004-11-15
Category : Technology & Engineering
ISBN : 0415363799
Structural Analysis of Historical Constructions contains about 160 papers that were presented at the IV International Seminar on Structural Analysis of Historical Constructions that was held from 10 to 13 November, 2004 in Padova Italy. Following publications of previous seminars that were organized in Barcelona, Spain (1995 and 1998) and Guimarães, Portugal (2001), state-of-the-art information is presented in these two volumes on the preservation, protection, and restoration of historical constructions, both comprising monumental structures and complete city centers. These two proceedings volumes are devoted to the possibilities of numerical and experimental techniques in the maintenance of historical structures. In this respect, the papers, originating from over 30 countries, are subdivided in the following areas: Historical aspects and general methodology, Materials and laboratory testing, Non-destructive testing and inspection techniques, Dynamic behavior and structural monitoring, Analytical and numerical approaches, Consolidation and strengthening techniques, Historical timber and metal structures, Seismic analysis and vulnerability assessment, Seismic strengthening and innovative systems, Case studies. Structural Analysis of Historical Constructions is a valuable source of information for scientists and practitioners working on structure-related issues of historical constructions
Author : Dimitris I Chortis
Publisher : Springer Science & Business Media
Page : 240 pages
File Size : 44,8 Mb
Release : 2013-06-29
Category : Technology & Engineering
ISBN : 9783319008646
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.
Author : Anonim
Publisher : Unknown
Page : 768 pages
File Size : 51,5 Mb
Release : 1994
Category : Aeronautics
ISBN : MINN:30000005901347
Author : Sondipon Adhikari
Publisher : John Wiley & Sons
Page : 373 pages
File Size : 55,7 Mb
Release : 2013-11-25
Category : Technology & Engineering
ISBN : 9781848215214
Since Lord Rayleigh introduced the idea of viscous damping in his classic work "The Theory of Sound" in 1877, it has become standard practice to use this approach in dynamics, covering a wide range of applications from aerospace to civil engineering. However, in the majority of practical cases this approach is adopted more for mathematical convenience than for modeling the physics of vibration damping. Over the past decade, extensive research has been undertaken on more general "non-viscous" damping models and vibration of non-viscously damped systems. This book, along with a related book Structural Dynamic Analysis with Generalized Damping Models: Identification, is the first comprehensive study to cover vibration problems with general non-viscous damping. The author draws on his considerable research experience to produce a text covering: dynamics of viscously damped systems; non-viscously damped single- and multi-degree of freedom systems; linear systems with non-local and non-viscous damping; reduced computational methods for damped systems; and finally a method for dealing with general asymmetric systems. The book is written from a vibration theory standpoint, with numerous worked examples which are relevant across a wide range of mechanical, aerospace and structural engineering applications. Contents 1. Introduction to Damping Models and Analysis Methods. 2. Dynamics of Undamped and Viscously Damped Systems. 3. Non-Viscously Damped Single-Degree-of-Freedom Systems. 4. Non-viscously Damped Multiple-Degree-of-Freedom Systems. 5. Linear Systems with General Non-Viscous Damping. 6. Reduced Computational Methods for Damped Systems
Author : Douglas M. Marshall,Richard K. Barnhart,Eric Shappee,Michael Thomas Most
Publisher : CRC Press
Page : 1944 pages
File Size : 41,9 Mb
Release : 2015-10-26
Category : Political Science
ISBN : 9781138026933
The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.
Author : Anonim
Publisher : Unknown
Page : 20 pages
File Size : 44,7 Mb
Release : 1988
Category : Science
ISBN : OSU:32435021763651
Author : Konstantin Naumenko,Holm Altenbach
Publisher : Springer
Page : 371 pages
File Size : 45,5 Mb
Release : 2016-05-11
Category : Science
ISBN : 9783319316291
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.
Author : Gerald G. Trantina,Ron Nimmer
Publisher : McGraw Hill Professional
Page : 382 pages
File Size : 51,7 Mb
Release : 1994
Category : Science
ISBN : 0070652023
How to predict thermoplastics behavior in high-performance structural applications Here's the very first engineering resource with all the data and design/analysis techniques you need to work with even the newest thermoplastics. Structural Analysis of Thermoplastic Components by Gerry Trantina and Ron Nimmer shows you how to predict stiffness, creep and fatigue of polymeric components--PLUS non-homogeneous materials such as structural foams and composites. You'll benefit from detailed comparisons of analytic prediction versus measured behavior and much more: Nonstandard property measurement and analysis; Nonlinearities associated with large deformations; Using structural geometry to offset low material stiffness; Designing thermoplastics to withstand impacts; Important loading variables, component lifetimes, frequency effects, hysteric heating and cyclic crack growth.
Author : Jan Awrejcewicz,Dariusz Grzelczyk
Publisher : BoD – Books on Demand
Page : 186 pages
File Size : 45,7 Mb
Release : 2020-03-25
Category : Mathematics
ISBN : 9781838802295
The quest to ensure perfect dynamical properties and the control of different systems is currently the goal of numerous research all over the world. The aim of this book is to provide the reader with a selection of methods in the field of mathematical modeling, simulation, and control of different dynamical systems. The chapters in this book focus on recent developments and current perspectives in this important and interesting area of mechanical engineering. We hope that readers will be attracted by the topics covered in the content, which are aimed at increasing their academic knowledge with competences related to selected new mathematical theoretical approaches and original numerical tools related to a few problems in dynamical systems theory.
Author : David I. G. Jones
Publisher : John Wiley & Sons
Page : 412 pages
File Size : 44,9 Mb
Release : 2001-07-10
Category : Technology & Engineering
ISBN : 0471492485
Die weitestgehende Verhinderung unerwünschter Vibrationen ist eine unbedingte Voraussetzung für eine fehlerfreie Funktion von Maschinen und Anlagen. Eine wirksame Lösung besteht darin, viskoelastische Werkstoffe in oder um das vibrierende Bauteil einzufügen. Dieser Band erklärt die Grundlagen der viskoelastischen Dämpfung in leicht verständlichem Stil.
