Durability and Damage Tolerance Evaluations of Jet Transport Structures

by I. C. Whittaker, Boeing Commerical Airplanes, United States,
M. Miller, Boeing Commerical Airplanes, United States,
U. G. Goranson, Boeing Commerical Airplanes, United States,



Document Type: Proceeding Paper

Part of: Structural Safety and Reliability

Abstract:

Many design considerations are involved in ensuring structural integrity of Boeing jet transports, which have common design features validated by extensive analyses, tests, and service performance. Designing for continued structural integrity in the presence of damage such as fatigue or corrosion is an evolutionary process. Performance demands, increasing structural complexity, and aging fleet reassessments have required development of standards suitable for application by large teams of engineers. This presentation is focused on such technology control methods with special emphasis on practical reliability considerations. Fatigue evaluations are based on a durability system that uses quantitative fatigue ratings that incorporate reliability considerations for test data reduction and fleet performance predictions. Damage detection assessments are based on detection reliability estimates coupled to damage growth and residual strength evaluations. Data are presented to airlines on check forms that permit efficient maintenance planning to achieve required detection reliability levels.

Subject Headings: Structural analysis | Structural reliability | Maintenance and operation | Fatigue tests | Fatigue (material) | Data analysis | Residual strength

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