Study on Test Method for Fracture Toughness of TA16 Heat Transfer Tube

In recent years, the fracture toughness assessment for small size tubes represented by SG heat transfer tubes has received more and more attention. In this study, a type of radial cracked C-shaped specimen was designed to estimate the fracture toughness of TA16 heat transfer tubes. The expressions of stress intensity factor K and J integral were obtained based on elastic plastic finite element analyses. A group of radial cracked C-shaped specimens for TA16 heat transfer tubes were carried out by using normalization method. The test results show that small data dispersions of J resistance curves and conditional initiation toughness J_Q are observed, the mean value of J_Q is 32.875 MPa•mm, and the standard deviation is 1.377 MPa•mm.