文献类型：期刊文献

英文题名：Experimental investigation of in-plane constraint and out-of-plane constraint effects on creep crack growth

作者：Tan, Jian-Ping[1]; Wang, Guo-Zhen[1]; Xuan, Fu-Zhen[1]; Tu, Shan-Tung[1]

机构：[1] MOE Key Laboratory of Pressurized System and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

年份：2012

卷号：5

起止页码：271

外文期刊名：American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

收录：EI(收录号：20133716713642)

语种：英文

外文关键词：Crack propagation - Pressure vessels

摘要：In order to establish an accurate integrity assessment of structures containing defects at high temperature, it is necessary to clarify the constraint effect on creep crack growth (CCG) property. However, the experimental investigation of constraint effects on creep crack growth has been little studied. In this study, the effects of the out-of-plane constraint and the in-plane constraint were investigated and considered via data obtained from compact tension (CT) specimens with different thicknesses and single edge-notched tensile (SENT) specimen. The results show that the constraint effect induced by specimen thickness (out-of-plane) and specimen types (in-plane) on CCG rate is related to load level C*. In the lower C* region, there are obvious differences in the CCG rate for different specimens, while the CCG rates of the different specimens are within a scatter band in the higher C* region. Meanwhile, the CCG rate da/dt versus C* on log-log scale is composed of two straight lines with different slops instead of a single linear relation. Because the straight line slope in the lower C* region is smaller than that in the higher C* region, it would be non-conservative if the CCG rate in the lower C* was extrapolated from that in the higher C*. Therefore, in order to conduct integrity assessment and life prediction at high temperature accurately, it is necessary to obtain the actual CCG rate in the lower C* (long-term data), and the constraint effect induced by specimen thickness and loading modes should be considered. Copyright ? 2012 by ASME.