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Composite Repair Theory and Design

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ISBN-10: 0080451462

ISBN-13: 9780080451466

Edition: 2007

Authors: Cong N. Duong, Chun Hui Wang

List price: $260.00
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Description:

'Composite Repair' is entirely devoted to the design and analysis of bonded repairs, focusing on the mathematical techniques and analysis approaches that are critical to the successful implementation of bonded repairs.
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Book details

List price: $260.00
Copyright year: 2007
Publisher: Elsevier Science & Technology
Publication date: 5/30/2007
Binding: Hardcover
Pages: 480
Size: 6.50" wide x 9.45" long x 0.48" tall
Weight: 2.046
Language: English

Dr. Cong Duong received a B.S. degree in Aerospace Engineering from California Polytechnic State University, Pomona (1984), a S.M. degree in Aeronautics and Astronautics from Massachusetts Institute of Technology (1986), and a Ph.D. in Applied Mechanics from California Institute of Technology (1994). He is currently an Associated Technical Fellow of the Boeing Company where he has been working in the durability and damage tolerance group for sixteen years. From 1999-2005, he was a principal investigator of the USAF funded Composite Repair of Aircraft Structures (CRAS) program. Under that program, he had developed and implemented analytical and computational methods for design and analysis…    

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