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http://dx.doi.org/10.9726/kspse.2014.18.1.091

Effect of Crack Orientation on Spatial Randomness of Fatigue Crack Growth Rate in FSWed 7075-T651 Aluminum Alloy Joints  

Jeong, Yeui-Han (Department of Mechanical Design Engineering, Pukyong National University)
Kim, Seon-Jin (Department of Mechanical & Automotive Engineering, Pukyong National University)
Publication Information
Journal of Power System Engineering / v.18, no.1, 2014 , pp. 91-98 More about this Journal
Abstract
In this investigation, the effect of crack orientation on spatial randomness of fatigue crack growth rate (FCGR) in friction stir welded (FSWed) 7075-T651 aluminum alloy joints has been statistically analyzed by Weibull distribution. The fatigue crack growth tests are conducted under three different constant stress intensity factor range (SIFR) control at room temperature with R = 0.1 and frequency 10Hz on compact tension (CT) specimen machined at base metal (BM) and weld metal (WM). The experimental fatigue crack growth rate data were obtained for two types of specimens having LT and TL orientations. LT specimens both base metal and weld metal showed higher fatigue crack growth rate as compared to TL specimens. In the lower SIFR region, FCGR were found to be almost 3 times higher in higher SIFR region. The shape parameter of Weibull both LT and TL orientation for FCGR was increased with increasing SIFR, the scale parameter was also increased with increasing SIFR. The smallest value of the shape parameter was shown in weld metal specimens having LT orientation at lower SIFR region.
Keywords
Crack Orientation; Spatial Randomness; Fatigue Crack Growth Rate; Weibull Distribution;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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