The airline structure design engineers often need to design repairs to restore structural integrity for conditions not covered in the Structural Repair Manuals (SRM) provided by the OEM. This is normally called repair beyond specification. Reasons for having to modify SRM repair include: variations in local structural configuration, limitations on space and variations in fastener usage or availability, and so on. As the local design loads are always unavailable for airline design engineers, the principle for repair design is to restore the ultimate static strength and the equivalent fatigue life. Through an example of a chord structure repair design, this paper provides an integrated methodology to design aircraft structure repairs beyond specification. The repair design is based on static analysis. In order to determine the minimum number of fasteners to fulfill the ultimate static strength requirement, the general failure modes for the joint structure and the approach to get its allowable is described. Since the end fasteners transfer more load than the center fasteners when parts are below yield, a joint modeling method is used to calculate the joint load distribution for the operating fatigue load. Based on the load distribution of the critical end fasteners and their geometry properties, the fatigue life could be calculated with a professional Damage Tolerance Analysis (DTA) software AFGROW. The results would be compared to the recommended SRM repair to check whether the fatigue life could be restored. Following the method provided in this paper, engineers could design repairs which can restore the integrity of the damaged aircraft structures.
Design and Stress Analysis for Aircraft Structure Repair Beyond Specification
Lect. Notes Electrical Eng.
International Conference on Aerospace System Science and Engineering ; 2019 ; Toronto, ON, Canada July 30, 2019 - August 01, 2019
Proceedings of the International Conference on Aerospace System Science and Engineering 2019 ; Kapitel : 19 ; 253-264
2020-03-01
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Repairs beyond specification , Fatigue life , Damage Tolerance Analysis Physics , Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) , Aerospace Technology and Astronautics , Control and Systems Theory , Vibration, Dynamical Systems, Control , Engineering Design , Physics and Astronomy
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