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http://dx.doi.org/10.5139/JKSAS.2003.31.9.026

A Study on the Application of Pre-Indentation Technique for Fastener Hole Model  

Hwang,Jeong-Seon (공군사관학교 기계공학과)
Jo,Hwan-Gi (공군사관학교 항공공학과)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.31, no.9, 2003 , pp. 26-31 More about this Journal
Abstract
Aging aircraft accumulates widespread fatigue damage commonly referred to as multiple site damage(MSO). For ductile material such as 2024-T3 aluminum, MSO may lower the service life below that which is predicted by conventional fracture mechanics. The present paper is concerned with the fatigue life extension by pre-indentation technique for thin 2024-T3 aluminum plate to decelerate the crack propagation rate in the panels with MSO. The panel with fastener holes can be simply modelled by Hole/Slot type Middle-Tension specimen. Results of fatigue testing show significantly improving failure cycles from 10 to 40 times. This retardation effect is decreased by increasing the loading level in the constant amplitude loading. In the sense of retardation mechanism, the crack propagation rate is gradually attenuated by entering the indentation mark and maintains at the lowest value for a long period after the edge of crack passes the center of indentation area.
Keywords
Multiple site damage; Pre-indentation; Crack propagation; Retardation Mechanism;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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