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Gunawan Dwi Haryadi,김선진 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.9
The present study evaluates the influences of PWHT on FCG behavior and tensile properties of TIG butt welded Al 6013-T4 sheets. Crack propagation tests were carried out on compact tension (CT) specimens. The T82 heat treatment was varied in three artificial aging times (soaking) of 6, 18 and 24 hours. The results of T82 heat treatment with artificial aging variations were tested for their fatigue crack growth rates at the main metal zone, the heat-affected zone (HAZ), and the welded metal zone. It has been observed that the various agings in heat treatment T82 are sensitive to the mechanical properties (fatigue crack growth rate test, tensile test). The results show that PWHT-T82 for 18 hours aging is the highest fatigue resistance, while the aging 18 hours provided the highest tensile test result.
손혜정,Gunawan Dwi Haryadi,김선진 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
The statistical aspects of fatigue crack growth life of base metal (BM), weld metal (WM) and heat affected zone (HAZ) in friction stirwelded (FSWed) 7075-T651 aluminum alloy has been studied by Weibull statistical analysis. The fatigue crack growth tests were performedat room temperature on ASTM standard CT specimens under three different constant stress intensity factor range controls. Themain objective of this paper is to investigate the effects of statistical aspects of fatigue crack growth life on stress intensity factor rangesand material properties, namely BM, WM and HAZ specimens. In this work, the Weibull distribution was employed to estimate the statisticalaspects of fatigue crack growth life. The shape parameter of Weibull distribution for fatigue crack growth life was significantlyaffected by material properties and the stress intensity factor range. The scale parameter of WM specimen exhibited the lowest value atall stress intensity factor ranges.