文献类型：会议论文

英文题名：Energy dissipation as a parameter to characterize creep crack growth

作者：Ma, Chunwei; Xuan, Fu-Zhen; Wang, Zhengdong; Tu, Shan-Tung

机构：[1]E China Univ Sci & Technol, Shanghai 200237, Peoples R China

会议论文集：Joint Meeting of the Annual Conference of Fracture Mechanics/Triennial Conference of High Temperature Strength of Material and Structure (FM 2006/HTSMS)

会议日期：NOV 17-20, 2006

会议地点：Nanjing, PEOPLES R CHINA

语种：英文

外文关键词：energy dissipation; creep crack growth; CT specimen; initial crack length; 2.25Cr1Mo; high temperature

摘要：A parameter named creep energy dissipation rate is proposed to interpret the creep crack behavior. First of all, creep crack growth rate is experimentally determined under monotonic loading condition by utilizing compact tension (CT) specimens of 2.25CrlMo steel with variable effective thickness and initial crack length. The grooves are machined in both sides of the compact tension (CT) specimens. Results indicate that the values of the creep energy dissipation rate at creep crack initiation depend on the initial crack length. The creep energy dissipation rate increases when the increment of crack length Delta a increases and decreases with the increasing effective thickness of CT specimen. Nevertheless, the size dependence of the global creep energy dissipation rate is insignificant and thus can be ignored in practice.