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Boundary Methods: Elements, Contours, and Nodes [Kõva köide]

(Ithaca, New York, USA), (Cornell University, Ithaca, New York, USA)
  • Formaat: Hardback, 248 pages, kõrgus x laius: 229x152 mm, kaal: 385 g, 20 Tables, black and white; 85 Illustrations, black and white
  • Sari: Mechanical Engineering
  • Ilmumisaeg: 17-Mar-2005
  • Kirjastus: CRC Press Inc
  • ISBN-10: 0824725999
  • ISBN-13: 9780824725990
Teised raamatud teemal:
  • Formaat: Hardback, 248 pages, kõrgus x laius: 229x152 mm, kaal: 385 g, 20 Tables, black and white; 85 Illustrations, black and white
  • Sari: Mechanical Engineering
  • Ilmumisaeg: 17-Mar-2005
  • Kirjastus: CRC Press Inc
  • ISBN-10: 0824725999
  • ISBN-13: 9780824725990
Teised raamatud teemal:
Intending to expand knowledge in computational models of solving problems in potential theory and linear elasticity, the authors focus on the boundary element method combined with the mesh-free method. They begin by describing the boundary element method with the boundary integral equation, error estimation and thin features, followed by the boundary contour method with linear elasticity, shape sensitivity analysis, shape optimization, error estimation and adaptivity. They then describe the boundary mode methods, with surface approximants, potential theory and elasticity, adaptivity for three-dimension potential theory, and adaptivity of three-dimension linear elasticity. Annotation ©2004 Book News, Inc., Portland, OR (booknews.com)

Boundary Methods: Elements, Contours, and Nodes presents the results of cutting-edge research in boundary-based mesh-free methods. These methods combine the dimensionality advantage of the boundary element method with the ease of discretization of mesh-free methods, both of which, for some problems, hold distinct advantages over the finite element method.

After introducing some novel topics related to the boundary element method (BEM), the authors focus on the boundary contour method (BCM)-a variant of the BEM that further reduces the dimensionality of a problem. The final section of the book explores the boundary node method, which combines the BEM with moving least-squares approximants to produce a mesh-free, boundary-only method.

The authors, who are also the primary developers of these methods, clearly introduce and develop each topic. In addition to numerical solutions of boundary value problems in potential theory and linear elasticity, they also discuss topics such as shape sensitivities, shape optimization, and adaptive meshing. Numerical results for selected problems appear throughout the book, as do extensive references.
Preface v
INTRODUCTION TO BOUNDARY METHODS xiii
I SELECTED TOPICS IN BOUNDARY ELEMENT METHODS 1(64)
1 BOUNDARY INTEGRAL EQUATIONS
3(20)
1.1 Potential Theory in Three Dimensions
3(3)
1.1.1 Singular Integral Equations
3(2)
1.1.2 Hypersingular Integral Equations
5(1)
1.2 Linear Elasticity in Three Dimensions
6(6)
1.2.1 Singular Integral Equations
6(2)
1.2.2 Hypersingular Integral Equations
8(4)
1.3 Nearly Singular Integrals in Linear Elasticity
12(2)
1.3.1 Displacements at Internal Points Close to the Boundary
12(1)
1.3.2 Stresses at Internal Points Close to the Boundary
13(1)
1.4 Finite Parts of Hypersingular Equations
14(9)
1.4.1 Finite Part of a Hypersingular Integral Collocated at an Irregular Boundary Point
14(3)
1.4.2 Gradient BIE for 3-D Laplace's Equation
17(2)
1.4.3 Stress BIE for 3-D Elasticity
19(1)
1.4.4 Solution Strategy for a HBIE Collocated at an Irregular Boundary Point
20(3)
2 ERROR ESTIMATION
23(16)
2.1 Linear Operators
23(2)
2.2 Iterated HBIE and Error Estimation
25(7)
2.2.1 Problem 1: Displacement Boundary Conditions
25(3)
2.2.2 Problem 2: Traction Boundary Conditions
28(2)
2.2.3 Problem 3: Mixed Boundary Conditions
30(2)
2.3 Element-Based Error Indicators
32(1)
2.4 Numerical Examples
33(6)
2.4.1 Example 1: Lame's Problem of a Thick-Walled Cylinder under Internal Pressure
34(2)
2.4.2 Example 2: Kirsch's Problem of an Infinite Plate with a Circular Cutout
36(3)
3 THIN FEATURES
39(26)
3.1 Exterior BIE for Potential Theory: MEMS
39(15)
3.1.1 Introduction to MEMS
39(2)
3.1.2 Electric Field BIEs in a Simply Connected Body
41(1)
3.1.3 BIES in Infinite Region Containing Two Thin Conducting Plates
41(5)
3.1.4 Singular and Nearly Singular Integrals
46(3)
3.1.5 Numerical Results
49(1)
3.1.6 The Model Problem - a Parallel Plate Capacitor
50(4)
3.2 BIE for Elasticity: Cracks and Thin Shells
54(13)
3.2.1 BIES in LEFM
54(6)
3.2.2 Numerical Implementation of BIES in LEFM
60(1)
3.2.3 Some Comments on BIEs in LEFM
61(1)
3.2.4 BIEs for Thin Shells
62(3)
II THE BOUNDARY CONTOUR METHOD 65(68)
4 LINEAR ELASTICITY
67(26)
4.1 Surface and Boundary Contour Equations
67(11)
4.1.1 Basic Equations
67(1)
4.1.2 Interpolation Functions
68(3)
4.1.3 Boundary Elements
71(2)
4.1.4 Vector Potentials
73(1)
4.1.5 Final BCM Equations
74(2)
4.1.6 Global Equations and Unknowns
76(1)
4.1.7 Surface Displacements, Stresses, and Curvatures
76(2)
4.2 Hypersingular Boundary Integral Equations
78(4)
4.2.1 Regularized Hypersingular BIE
78(1)
4.2.2 Regularized Hypersingular BCE
78(2)
4.2.3 Collocation of the HBCE at an Irregular Surface Point
80(2)
4.3 Internal Displacements and Stresses
82(3)
4.3.1 Internal Displacements
82(1)
4.3.2 Displacements at Internal Points Close to the Bounding Surface
82(1)
4.3.3 Internal Stresses
83(1)
4.3.4 Stresses at Internal Points Close to the Bounding Surface
84(1)
4.4 Numerical Results
85(8)
4.4.1 Surface Displacements from the BCM and the HBCM
85(2)
4.4.2 Surface Stresses
87(3)
4.4.3 Internal Stresses Relatively Far from the Bounding Surface
90(1)
4.4.4 Internal Stresses Very Close to the Bounding Surface
90(3)
5 SHAPE SENSITIVITY ANALYSIS
93(22)
5.1 Sensitivities of Boundary Variables
93(6)
5.1.1 Sensitivity of the BIE
93(1)
5.1.2 The Integral Ik
94(2)
5.1.3 The Integral Jk
96(2)
5.1.4 The BCM Sensitivity Equation
98(1)
5.2 Sensitivities of Surface Stresses
99(2)
5.2.1 Method One
100(1)
5.2.2 Method Two
100(1)
5.2.3 Method Three
100(1)
5.2.4 Method Four
101(1)
5.3 Sensitivities of Variables at Internal Points
101(5)
5.3.1 Sensitivities of Displacements
101(2)
5.3.2 Sensitivities of Displacement Gradients and Stresses
103(3)
5.4 Numerical Results: Hollow Sphere
106(4)
5.4.1 Sensitivities on Sphere Surface
107(1)
5.4.2 Sensitivities at Internal Points
108(2)
5.5 Numerical Results: Block with a Hole
110(5)
5.5.1 Geometry and Mesh
110(2)
5.5.2 Internal Stresses
112(1)
5.5.3 Sensitivities of Internal Stresses
112(3)
6 SHAPE OPTIMIZATION
115(10)
6.1 Shape Optimization Problems
115(1)
6.2 Numerical Results
116(9)
6.2.1 Shape Optimization of a Fillet
116(2)
6.2.2 Optimal Shapes of Ellipsoidal Cavities Inside Cubes
118(4)
6.2.3 Remarks
122(3)
7 ERROR ESTIMATION AND ADAPTIVITY
125(8)
7.1 Hypersingular Residuals as Local Error Estimators
125(1)
7.2 Adaptive Meshing Strategy
126(1)
7.3 Numerical Results
127(8)
7.3.1 Example One - Short Clamped Cylinder under Tension
127(3)
7.3.2 Example Two - the Lame Problem for a Hollow Cylinder
130(3)
III THE BOUNDARY NODE METHOD 133(70)
8 SURFACE APPROXIMANTS
135(16)
8.1 Moving Least Squares (MLS) Approximants
135(4)
8.2 Surface Derivatives
139(2)
8.3 Weight Functions
141(1)
8.4 Use of Cartesian Coordinates
142(9)
8.4.1 Hermite Type Approximation
142(1)
8.4.2 Variable Basis Approximation
143(8)
9 POTENTIAL THEORY AND ELASTICITY
151(24)
9.1 Potential Theory in Three Dimensions
151(14)
9.1.1 BNM: Coupling of BIE with MLS Approximants
151(4)
9.1.2 HBNM: Coupling of HBIE with MLS Approximants
155(1)
9.1.3 Numerical Results for Dirichlet Problems on a Sphere
156(9)
9.2 Linear Elasticity in Three Dimensions
165(10)
9.2.1 BNM: Coupling of BIE with MLS Approximants
165(2)
9.2.2 HBNM: Coupling of HBIE with MLS Approximants
167(1)
9.2.3 Numerical Results
168(7)
10 ADAPTIVITY FOR 3-D POTENTIAL THEORY
175(18)
10.1 Hypersingular and Singular Residuals
175(2)
10.1.1 The Hypersingular Residual
175(1)
10.1.2 The Singular Residual
176(1)
10.2 Error Estimation and Adaptive Strategy
177(3)
10.2.1 Local Residuals and Errors - Hypersingular Residual Approach
178(1)
10.2.2 Local Residuals and Errors - Singular Residual Approach
178(1)
10.2.3 Cell Refinement Criterion
179(1)
10.2.4 Global Error Estimation and Stopping Criterion
179(1)
10.3 Progressively Adaptive Solutions: Cube Problem
180(8)
10.3.1 Exact Solution
181(1)
10.3.2 Initial Cell Configuration #1 (54 Surface Cells)
181(1)
10.3.3 Initial Cell Configuration #2 (96 Surface Cells)
182(6)
10.4 One-Step Adaptive Cell Refinement
188(5)
10.4.1 Initial Cell Configuration #1 (54 Surface Cells)
190(1)
10.4.2 Initial Cell Configuration #2 (96 Surface Cells)
191(2)
11 ADAPTIVITY FOR 3-D LINEAR ELASTICITY
193(10)
11.1 Hypersingular and Singular Residuals
193(1)
11.1.1 The Hypersingular Residual
193(1)
11.1.2 The Singular Residual
194(1)
11.2 Error Estimation and Adaptive Strategy
194(1)
11.2.1 Local Residuals and Errors - Hypersingular Residual Approach
194(1)
11.2.2 Local Residuals and Errors - Singular Residual Approach
195(1)
11.2.3 Cell Refinement Global Error Estimation and Stopping Criterion
195(1)
11.3 Progressively Adaptive Solutions: Pulling a Rod
195(3)
11.3.1 Initial Cell Configuration
197(1)
11.3.2 Adaptivity Results
197(1)
11.4 One-Step Adaptive Cell Refinement
198(5)
Bibliography 203(16)
Index 219
Subrata Mukherjee, Yu Xie Mukherjee