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http://dx.doi.org/10.3795/KSME-A.2007.31.3.344

The Effect of Defect Location Near a Circular Hole Notch on the Relationship Between Crack Growth Rate (da/dN) and Stress Intensity Factor Range (δK) - Comparative Studies of Fatigue Behavior in the Case of Monolithic Al Alloy vs. Al/GFRP Laminate -  

Kim, Cheol-Woong (고려대학교 기계공학과/(주)비엠바이텍)
Ko, Young-Ho (숭실대학교 대학원 기계공학과)
Lee, Gun-Bok (숭실대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.3, 2007 , pp. 344-354 More about this Journal
Abstract
The objective of this study is to investigate the effect of arbitrarily located defect around the circular hole in the aircraft structural material such as Al/GFRP laminates and monolithic Al alloy sheet under cyclic bending moment. The fatigue behavior of these materials may be different due to the defect location. Material flaws in the from of pre-existing defects can severely affect the fatigue crack initiation and propagation behavior. The aim of this study is to evaluate effects of relative location of defects around the circular hole in monolithic Al alloy and Al/GFRP laminates under cyclic bending moment. The fatigue behavior i.e., the stress concentration factor($K_t$), the crack initiation life($N_i$), the relationship between crack length(a) and cycles(N), the relationship between crack growth rate(da/dN) and stress intensity factor range(${\Dalta}K$) near a circular hole are considered. Especially, the defects location at ${\theta}_1=0^{\circ}\;and\;{\theta}_2=30^{\circ}$ was strongly effective in stress concentration factor($K_t$) and crack initiation life($N_i$). The test results indicated the features of different fatigue crack propagation behavior and the different growing delamination shape according to each location of defect around the circular hole in Al/GFRP laminates.
Keywords
Al/GFRP Laminate; Fiber Bridge Effect; Circular Hole Notch; Artificial Defect; Fatigue Crack Initiation Life($N_i$; Crack Growth Rate(da/dN); Stress Intensity Factor Range${\Dalta}K$; Multi Site Damage(MSD); Delamination;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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