Reliability Evaluation of 7A60 Aluminum Alloy with Defects
Reliability of 7A60 Aluminum Alloy with defects is evaluated.Creep fracture time of the alloy with artificial scrape under constant load is measured at a dedicated temperature.In addition,size allowance of outer surface defects of the alloy is calculated and reliability of the alloy is evaluated according to the stress strength factor threshold Kth of creep fracture obtained by the creep testing of the alloy cylinders.The stress strength factor threshold Kth of creep rupture of Al alloy is 16MPam1/2 and the depth allowance a/ of outer surface scrape is 0.18 millimeter when the maximal service stress of Al alloy is half of the yield strength of the alloy and allowable stress strength factor KI(allowance) is 8MPam1/2.These results are consistent with that from the accelerated life testing of Al alloy cylinders with defects.These results indicate that Al alloy with cracks less than 0.18 millimeter in depth rarely creep or rupture and could be used safely in a highspeed rotary device for a long term.
7A60 Aluminum Alloy reliability creep fracture depth allowance of crack
Kai Zhao Kai Zhao Yiqiang Kou
School of Material Science and Engineering TIANJIN University TIANJIN,P.R.China Research Institute of Physical and Chemical Engineering of Nuclear Industry TIANJIN,P.R.China
国际会议
2009 8th International Conference on Reliability,Maintainability and Safety(第八届中国国际可靠性、维修性、安全性会议)
成都
英文
1208-1211
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）