Abstract Structural Integrity Programs as part of the development of new aircraft, a major change to type design, a continued airworthiness program, or the development of a supplemental structural inspection document; require a large set of initial assumptions, particularly in the area of fatigue and damage tolerance. This review paper outlines assumptions, the associated risks, and methods of how to manage these risks. Airplane or Rotorcraft certified under the requirements of Part 23 and Part 27 respectively, are considered as “small”. The selected certification basis defines the fatigue evaluation requirement, where different concepts are applicable depending on the type of component, the design, and the material. The structural development process involves the steps of mission and usage assumptions, spectrum development for components including principal structural elements, fatigue load derivation, material selection, and material data derivation as part of the building block testing approach. This process includes development, certification, and qualification tests to cover conventional designs and advanced manufacturing technologies. Damage tolerance analyses require software tools and adequate libraries of Stress Intensity Factors. The selection of scatter factors and life improvement factors for interference fit fasteners, cold worked holes, or shot peened structure as well as the definition of initial and detectable crack sizes with their probability of detection are important parameters. Every step involves assumptions and simplifications with associated risks, that are often covered by conservatism and defined by judgement, however, when quantification becomes inevitable, probabilistic approaches should be employed.


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    Title :

    Risks of Initial Assumptions in Fatigue and Damage Tolerance of Small Aircraft Development Programs


    Contributors:


    Publication date :

    2019-07-03


    Size :

    14 pages





    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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