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