Computational Welding Mechanics: Thermomechanical and Microstructural Simulations - Rilegato

9781420063370: Computational Welding Mechanics: Thermomechanical and Microstructural Simulations

Rilegato

ISBN 10: 1420063375 ISBN 13: 9781420063370

Casa editrice: CRC Press, 2007

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Computational Welding Mechanics (CWM) provides an important technique for modeling welding processes. Welding simulations are a key tool in improving the design and control of welding processes and the performance of welded components or structures. CWM can be used to model phenomena such as heat generation, thermal stresses, and large plastic deformations of components or structures. It also has a wider application in modeling thermomechanical and microstructural phenomena in metals. This important book reviews the principles, methods, and applications of CWM. The book begins by discussing the physics of welding before going on to review modeling methods and options as well as validation techniques. It also reviews applications in areas such as fatigue, buckling, and deformation, improved service life of components, and process optimization. Some of the numerical methods described in the book are illustrated using software available form the author that allows you to explore CWM in more depth. Computational Welding Mechanics will be a standard work for welding engineers and all those researching welding processes and wider thermomechanical and microstructural phenomena in metals.

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Contenuti

INTRODUCTION
Computational Welding Mechanics
of the Book
The Competent Company
Driving Forces for Increased Use of Welding Simulations
THE MULTI-PHYSICS OF WELDING
COUPLINGS AND REFERENCE FRAMES
Coupled Systems and Solution Procedures
Linearized Coupled Thermo-Elasticity
Decoupling of the Sub-Domains of Welding Simulations
THERMO-MECHANICS OF WELDING
The Thermal Cycle and Microstructure Evolution
The Satoh Test
Welding of Plate
Welding of Pipe
NONLINEAR HEAT FLOW
Basic Equations of Nonlinear Heat Conduction
Finite Element Formulation of Nonlinear Heat Conduction
NONLINEAR DEFORMATION
Basic Choices in Formulation of Nonlinear Deformation
Finite Element Formulation of Nonlinear Deformation
Constitutive Model
Stress Updating Algorithm for Deviatoric Plasticity
NUMERICAL METHODS AND MODELING FOR EFFICIENT SIMULATIONS
Element Technologies
Meshing
Dynamic and Adaptive Meshing
Substructuring
Parallel Computing
Dimensional Reduction
Weld Pass Reduction
Replacement of Weld by Simplified Loads
CALIBRATION AND VALIDATION STRATEGY
Definition of Concepts Used
Code Verification
Model Refinement and Qualification
General Approach for Validation
Calibration and Validation Strategy
Validation Using Subsystems and Complete Systems
MODELING OPTIONS IN COMPUTATIONAL WELDING MECHANICS (CWM)
A Note about Computability in CWM
The Importance of Material Modeling
Effect of Temperature and Microstructure
Density
Thermal Properties
Elastic Properties
Plastic Properties and Models
Thermomechanical Properties
Microstructure Evolution
Material Modeling in Weld Pool
Surface Properties
Heat Input Models
Geometric Models
MODELING STRATEGY
Accuracy and Weld Flexibility Categories for CWM Models
Characteristics of Different Accuracy Categories
Motivation for Proposed Modeling Strategy
ROBUSTNESS AND STABILITY
Definitions Concerned with Robustness and Stability
Perturbation Methods for Investigation of Robustness
Methods for Analysis of Stability
Application of Robustness and Stability Analysis in CWM
THE CURRENT STATE OF COMPUTATIONAL WELDING MECHANICS (CWM)
Heat Input Models
Material Models
Models for Fatigue and Cracking
Computational Efficiency
Simplified Method
Reducing Risk for Buckling, Deformations, and Residual Stresses
Improved Life
Repair Welding
Optimization
Simulation of Welding and Other Manufacturing Steps
USING COMPUTATIONAL WELDING MECHANICS (CWM) IN PRACTICE: THE VOLVO AERO STORY
History
Strategic Decisions for Successful Implementation
Business Motivation for CWM
Examples
INDEX