A new specimen for high-grade pipeline steels CTOA test

作者：Di, Yan; Shuai, Jian^*; Wang, Junqiang; Tu, Shengwen

来源：Engineering Fracture Mechanics, 2015, 148: 203-212.

DOI：10.1016/j.engfracmech.2015.06.088

• Crack tip opening angle
• Modified compact tension specimen
• X80 pipeline steel
• Digital image correlation method
• Gurson-Tvergarrd-Needleman model

In order to accurately measure CTOA of high-grade pipeline steels, a new modified compact tension (MCT) specimen was designed to alleviate the drawbacks of standard tests specimens and MDCB specimen. CTOA of X80 pipeline steel was measured using DIC technology with MCT specimen which behaves steady-state propagation in tearing process. FE method was adopted to verify the accuracy of results acquired from experiment tests. Results from DIC technology agree well with those from FE method. Based on the results of tests, FE simulation and comparison with MDCB specimen test previously conducted with the same material, it shows that MCT specimen is available for high grade pipeline steel CTOA test.

• 出版日期2015-11
• 单位中国特种设备检测研究院; 中国石油大学（北京）