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Preface | |
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Acknowledgements | |
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Disclaimer | |
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Introduction | |
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Objectives of Bonded Repairs and an Overview of the Repair Process | |
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Structural assessment | |
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Repair design | |
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Installation of the repair | |
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Objectives of This Book | |
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Review of Past and Current Work on Design and Analysis of Bonded Repair | |
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Basic Elements of Fracture Mechanics Theory | |
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Theory of Bonded Doublers and Bonded Joints | |
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Introduction | |
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Stress Analysis of Two-Sided Doublers and Double-Strap Joints | |
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Elastic analysis of two-sided doublers and double-strap joints | |
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Elastic-plastic analysis of two-sided doublers and double-strap joints | |
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Peel stresses in two-sided doublers and double-strap joints | |
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Stress Analysis of One-Sided Bonded Double and Single-Strap Joints | |
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Stage I: Solution for bending moment at ends and middle of overlap | |
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Stage II: Solution for induced adhesive peel stresses | |
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Stage III: Solution for induced adhesive shear stresses | |
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Consideration of Other Important Effects in Bonded Doublers and Joints | |
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Stress-free condition at the adhesive ends | |
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Corner singularity | |
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Stress concentration in adherends | |
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Triaxial stresses and plastic yielding | |
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Failure Criteria for Bonded Doublers and Joints | |
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Summary | |
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Fundamental Concept of Crack Patching | |
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Introduction | |
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Formulation and Notation | |
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Symmetric or Fully Supported One-Sided Repairs | |
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Stage I: Load attraction by patch | |
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Stage II: Stress intensity factor | |
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The effect of plastic adhesive | |
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The effect of finite crack size | |
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The effect of mixed mode loading | |
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One-Sided Repairs | |
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Thermal Stresses | |
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Summary | |
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Mathematical Theory of Supported One-Sided Crack Patching or Two-Sided Crack Patching | |
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Introduction | |
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Stage I: Load Attraction | |
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Equivalent inclusion method | |
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Inclusion problem with polynomial eigenstrains | |
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Solution of the load attraction problem | |
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Load attraction with thermal effects | |
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Stage II: Fracture Analysis | |
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Cracked sheet displacements and stresses | |
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Composite patch displacements and stresses | |
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Stress intensity factor evaluation | |
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Numerical Illustrations | |
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Thermal Constraints | |
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Summary | |
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Approximate Theory of Unsupported One-Sided Crack Patching | |
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Introduction | |
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Stage I: Geometrically Linear Analysis | |
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Inclusion with constant eigencurvature | |
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Geometrically linear analysis of polygonal patch | |
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Geometrically Nonlinear Analysis of Stage I | |
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Thermal stresses in polygonal patch | |
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Patch spanning across the entire plate's width under purely mechanical loading | |
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Polygonal patch under combined thermo-mechanical loading | |
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Stage II: Fracture Analysis Using Crack-bridging Model | |
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Determination of spring constants | |
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Fracture analysis by crack-bridging model | |
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Numerical solutions of integral equations | |
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Illustrative examples | |
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Thermal Residual Stresses Resulting from Bonding | |
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Rose's or Barneveld-Fredell's curing model | |
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Duong and Yu's curing model | |
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Wang and Erjavec's curing model | |
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Characterization of Fatigue Crack Growth in One-Sided Patching | |
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Summary | |
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Analytical Approach to Repairs of Corrosion Grind-Outs | |
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Introduction | |
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Fundamental Concepts | |
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Eshelby solution for elliptical inhomogeneities | |
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Analytical solution of elliptical patches | |
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Formulas for a special case of an elliptical isotropic patch with a Poisson's ratio same as skin | |
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General Solution of Polygon-Shaped Patches | |
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Polygonal inhomogeneity with variable stiffness | |
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Repair over an elliptical grind-out | |
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Summary | |
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Bond-line Analysis at Patch Ends | |
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Introduction | |
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One-Dimensional Analysis of Tapered Patches and Doublers | |
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Mathematical formulation and two-step solution method | |
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Solution for nonlinear moment distribution along the joint | |
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Solutions for peel and shear stresses in the adhesive | |
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Numerical examples | |
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One-Dimensional Analysis of Tapered Patches and Doublers Including Effects of Thermal Mismatch and Adhesive Plasticity | |
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Extension to include the effect of thermal mismatch | |
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Extension to include the effect of adhesive plasticity | |
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Approximate Method for Adhesive Stresses at Patch End in a One-Sided Repair | |
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Approximate Method for Adhesive Stresses at Patch End in a Two-Sided Repair | |
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Summary | |
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Fatigue Crack Growth Analysis of Repaired Structures | |
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Introduction | |
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Crack-Closure Analysis of Repaired Cracks | |
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Crack closure of repaired cracks under small-scale yielding | |
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Crack closure of repaired cracks under large-scale yielding | |
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Overload Effect and Validation Using Finite Element Method | |
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Comparison with Experimental Results | |
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Summary | |
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A Preliminary Design Approach for Crack Patching | |
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Introduction | |
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Basic Analysis Methods Used in the Preliminary Design Approach | |
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Analysis method for a repair subjected only to mechanical loads | |
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Analysis method for a repair subjected to thermo-mechanical loads | |
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Design Criteria | |
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Design criteria for cracked skin | |
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Design criteria for patch | |
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Design criteria for adhesive | |
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Material Selection | |
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Patch materials | |
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Adhesive materials | |
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Preliminary Design Procedure | |
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Design procedure for a repair subjected only to mechanical loads | |
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Design procedure for a repair subjected to thermo-mechanical loads | |
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An Illustrative Example Using Design Process | |
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Loading conditions | |
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Design parameters | |
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Summary | |
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A Preliminary Design Approach for Corrosion Repairs | |
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Introduction | |
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Basic Analysis Methods Used in the Preliminary Design Approach | |
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Analysis method for a repair subjected only to mechanical loads | |
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Analysis method for a repair subjected to thermo-mechanical loads | |
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Design Criteria | |
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Design criteria for corroded skin or substrate | |
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Design criteria for patch | |
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Design criteria for adhesive | |
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Preliminary Design Procedure | |
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Summary | |
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Experimental Verifications of Analytical Methods | |
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Introduction | |
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Fatigue Crack Growth Tests and Method Validation | |
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Fatigue crack growth tests | |
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Characterization of fatigue crack growth in one-sided and two-sided repairs | |
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Fatigue crack growth analysis | |
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Comparison between analytical predictions and test results | |
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Load Attraction Tests and Method Validation | |
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Load attraction tests | |
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Comparison between analytical prediction and test results | |
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Summary | |
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Repair of Sonic Fatigue | |
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Introduction | |
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Structural Response to Acoustic Loading | |
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Analysis of Damped Repairs | |
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Dynamic analysis of layered beams | |
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Influence of structural damping | |
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Static and dynamic responses of damped repair | |
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Stresses and stress intensity factors in the repaired skin | |
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Fatigue Crack Growth Analysis | |
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Optimization of Damped Repairs | |
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An Illustrative Example | |
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Repair Analysis Methods Accounting for Secondary Effects | |
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Effect of Tapering on Load Attraction of Bonded Patches | |
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Effect of Patches in Proximity on Load Attraction | |
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Effect of Adherend Shear Deformation on Repair Efficiency | |
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Concluding Remarks | |
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Introduction to CRAS Software | |
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References | |
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Index | |