03 February 2009

[yim333] Computational Welding Mechanics - John A. Goldak, Mehdi Akhlaghi

Computational welding mechanics (CWM) provides an important technique for modelling 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 modelling thermomechanical and microstructural phenomena in metals. This important book reviews the principles, methods and applications of CWM.

Table of Contents

Introduction
Computational welding mechanics - Contents of 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 - Linearised 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 modelling 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
Definitions of concepts used - Code verification - Model refinement and qualification - General approach for validation - Calibration and validation strategy - Validation using subsystems and complete systems
Modelling options in computational welding mechanics (CWM)
A note about computability in CWM - The importance of material modelling - Effect of temperature and microstructure - Density - Thermal properties - Elastic properties - Plastic properties and models - Thermomechanical properties - Microstructure evolution - Material modelling in weld pool - Surface properties - Heat input models - Geometric models
Modelling strategy
Accuracy and weld flexibility categories for CWM models - Characteristics of different accuracy categories - Motivation for proposed modelling 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 or residual stresses - Improved life - Repair welding - Optimisation - Simulation of welding and other manufacturing steps
Using computational welding mechanics (CWM) in practice: the Volvo Aero story H Runnemalm and H Alberg, Volvo Aero Corporation, Sweden
History - Strategic decisions for successful implementation - Business motivation for CWM - Examples
Index

# Title : Computational Welding Mechanics
# Author : John A. Goldak, Mehdi Akhlaghi
# Paperback: 641 pages
# Publisher: Springer (2005)
# Language: English
# ISBN: 0387232877

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