National Research Council of Canada. NRC Institute for Aerospace Research
27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010, Sept. 19-24, 2010, Nice, France
Damage tolerance; Fea; Monte Carlo; Multi-Site damage; Risk assessment
This paper presents results from NRC's development of advanced damage tolerance analysis (DTA) and risk assessment methods and tools for aircraft structures, including build-up structures containing multi-site fatigue damage (MSD) and multi-element damage (MED), to support the Canadian Forces (CF) aircraft structural life cycle management. The DTA methods developed include new closedform solutions and generic finite element (FE) based tools to calculate the stress intensity factor (SIF) and the ß-solutions for build-up structural configurations. To facilitate the risk assessment, an in-house crack growth analysis program, CanGROW, was developed to simultaneously grow multiple cracks. Guidelines were established to calculate the residual strength of MSD/MED structures using global and/or local FE models, considering load redistribution among adjacent components. For the MSD risk analysis, an efficient Monte Carlo simulation technique was developed to determine the crack size distributions at different inspection intervals, which were then used in NRC's risk analysis code ProDTA to calculate the single flight hour probability of failure. Case studies on critical locations of the CC-130 centre wing structure are presented to demonstrate the capability of the developed methods and tools.
Congress of International Council of the Aeronautical Sciences (ICAS 2010): 1863–1872.