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http://dx.doi.org/10.20910/JASE.2018.12.3.38

A Study on the Improvement of Crack Propagation in Wing Root Fairing Support by Pre-load in Military Aircraft Production Process  

Shin, Jae Hyuk (Defense Agency for Technology and Quality)
Jeong, Su-Heon (Defense Agency for Technology and Quality)
Kang, Gu-Heon (Defense Agency for Technology and Quality)
Lee, Heon Sub (Korea Aerospace Industries)
Publication Information
Journal of Aerospace System Engineering / v.12, no.3, 2018 , pp. 38-44 More about this Journal
Abstract
Military aircraft may have fatigue cracks in structurally weak areas due to multiple factors such as the accumulation of flight time while perform various missions and unpredictable air conditions. As a fatigue crack progresses, there is a risk that the structure will be destroyed in extreme cases, which can have a significant impact on flight safety. In this study, a cracking phenomenon was observed during the periodic inspection the inner support of the fairing, which is installed to protect the connection between the wing and the body of the aircraft. Therefore, a study on a series of quality improvement processes for reformation was described. In order to identify the causes of cracks, pre-load generation occurrence during the wing assembly process was investigated and a fracture analysis was performed. Also, the design of the support structure was suggested in terms of preventing recurrence of cracks. The structural integrity was verified using a stress and fatigue life analysis.
Keywords
Military Aircraft; Fatigue Crack; Fatigue Striation; Pre-load; Root Fairing Support;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 D. S. Shim, M. T. Kim, H. W. Yeom, D. M. Im, Y. J. Kim, W. S. Uhm, "A Study on the Elevator Spar Improvement for the Operating Aircraft", Journal of the KIMST, Vol. 17, No. 1, pp. 001-005, Jul 2016.
2 Y. J. Kim, H. G. Kim, C. Y. Kim, J. J. Chang, M. Y. Lee, "Fatigue Analysis to Determine the Repair Limit for the Damaged Fastener Hole of Aging Aircraft(P-3CK)", Journal of the Korean Society for Aeronautical and Space Sciences, Vol. 41, No. 12, pp. 959-966, Dec 2013.   DOI
3 F85PR0029, "Low Speed Wind Tunnel Test Report"
4 F85PR0030, "High Speed Wind Tunnel Test Report"
5 F85PR0028, "Loads Analysis Report"
6 Y. G. Kang, C. M. Suh, W. J. Park, "Fatigue Crack Shape Variations by a Residual Stress and Fatigue Life Prediction", Journal of Ocean Engineering and Technology, Vol. 7, No. 2, pp. 68-78, Dec 1993.
7 H. K. Cho, J. S. Park, "Analysis of the Extension Effect of Fatigue Life by Pre-Indentation in Aluminum Alloy Plates", Journal of Aerospace System Engineering, Vol. 1, No. 1, pp. 48-52, Mar, 2007.
8 Basic Reliability Engineering for Mechanical Series, pp. 23-30, GS intervision, Aug 2013.
9 S. M. Tak, M. K. Kang, D. J. Park, S. S. Lee, "FEM Analysis of the Spline Joint with Bolt Pre-load", Journal of the Korean Society for Precision Engineering, Vol. 28, No. 11, pp. 1316-1322, Nov 2011.
10 J. Woodtili, W. Muster, and J. C. Radon, "Residual Stress Effect in Fatigue Crack Growth", Engineering Fracture Mechanics, Vol. 24, No. 3, pp. 399-412, 1986.   DOI
11 K. J. Kang, J. H. Song and Y. Y. Earmme, "Fatigue Crack Growth and Closure Behaviour Through a Compressive Residual Stress Field", Fatigue Engng mater. Struct., Vol. 13, No. 1, pp. 1-13, 1990.   DOI