Composite Repair

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 of bonded repairs over metallic aircraft structures. He is currently developing analytical methods for determining the allowable damage limits and the allowable repair limits on airframe of the new Boeing 787. He has published about twenty papers in peer-review journals, mostly on the subjects of bonded repairs, bonded joints and fracture mechanics. Dr. Chun Wang is a Principal Research Scientist and the Head of Composite and Low-Observable Structures in the Air Vehicles Division, DSTO, Australia. He has a PhD in Mechanical Engineering from the University of Sheffield, UK. Prior to joining DSTO in 1995, he held academic positions at the University of Sheffield (UK), the University of Sydney (Australia) and Deakin University (Australia). His main research expertises are in the areas of fatigue and fracture mechanics, composite structures, bonded structural repairs, and scattering of acoustic and electromagnetic waves. He has published over eighty journal articles and book chapters, and over eighty conference papers.

• 1. Introduction2. Theory of Bonded Doublers and Bonded Joints3. Fundamental Concept of Crack Patching4. Mathematical Theory of Supported One-Sided Crack Patching or Two-Sided Crack Patching5. Approximate Theory of Unsupported One-Sided Crack Patching6. Analytical Approach to Repairs of Corrosion Grind-Outs7. Bond Line Analysis at Patch Ends8. Fatigue Crack Growth Analyses of Repaired Structures9. A Preliminary Design Approach for Crack Patching10. A Preliminary Design Approach for Corrosion Repairs11. Experimental Verification of Analytical Methods12. Repair of Sonic Fatigue13. Repair Analysis Methods Accounting for Secondary Effects14. Concluding Remarks