Advances Repair Metallic Aircraft Structure（A.A.Baker 2002)

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  The introduction of the technology for bonded composite repairs of metallic airframe structures could not have come at a more opportune time. Today, many countries are facing the challenge of aging aircraft in their inventories. These airframes are degrading due to damage from fatigue cracking and corrosion. Repair with dependable techniques to restore their structural integrity is mandatory. The concept of using bonded composite materials as a means to maintain aging metallic aircraft was instituted in Australia approximately thirty years ago. Since that time it has been successfully applied in many situations requiring repair. These applications have not been limited to Australia. Canada, the United Kingdom, and the United States have also benefited from the use of this technology. The application for the solution of the problem of cracking in the fuel drain holes in wing of the C-141 is credited with maintaining the viability of this fleet.
  The concept for composite repair of metallic aircraft is simple. The bonded repair reduces stresses in the cracked region and keeps the crack from opening and therefore from growing. This is easy to demonstrate in a laboratory environment. It is another thing to do this in the operational environment where many factors exist that could adversely affect the repair reliability. The researchers at the Aeronautical and Maritime Research Laboratory in Australian realized there were many obstacles to overcome to achieve the desired reliability of the process. They also realized that failures of the repair on operational aircraft would mean loss of confidence and consequently enthusiasm for the process. They proceeded slowly. Their deliberate approach paid off in that they developed a process that could be transitioned to aircraft use by engineers and technicians. The essential ingredient for application of this technology is discipline. When the applicator of this process maintains the discipline required for the process and stays within the bounds of appropriate applications, then the repair will be successful.
  This book, edited by Drs A.A. Baker, L.R.F. Rose and R. Jones, includes the essential aspects of the technology for composite repairs. The editors have chosen some of the most knowledgeable researchers in the field of bonded repairs to discuss the issues with the many aspects of this technology. Included are discussions on materials and processes, design of repairs, certification, and application considerations. These discussions are sufficiently in-depth to acquaint the reader with an adequate understanding of the essential ingredients of the procedure. The application case histories are especially useful in showing the breadth of the possible uses of the technology.
  It is easy to be excited about the future of composite repairs to metallic airframes. It has all the ingredients for success. Today’s applications have shown that it is reliable, there is typically a significant return on the investment, and it can be transitioned to potential users. Additional research will open up possible new applications.
  This book is intended to provide the reader with a good understanding of the basic elements of this important technology. It fulfills that purpose.
  John W. Lincoln
  Technical Adviser for Aircraft Structural Integrity
  United States Air Force  

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Advances Repair Metallic Aircraft Structure（A.A.Baker 2002)