A method to evaluate ductile fracture toughness based on load separation principle

作者：Bao, Chen^*; Cai, Li xun; He, Guang wei; Wu, Yuan jun

来源：Fatigue and Fracture of Engineering Materials and Structures, 2019, 42(1): 178-186.

DOI：10.1111/ffe.12893

• ductile fracture toughness
• instantaneous crack size
• J-resistance curves
• load separation-based direct calibration (LSDC) method

In combination with load separation principle, the P-V curves of blunt-notched specimens with different stationary cracks can be explicitly expressed as a unified formula. Further, a load separation-based direct calibration (LSDC) method to predict instantaneous crack size and J-resistance curve of growing cracked specimen has been developed. Two specimen configurations, compact tension and single edge-notched bending, which are made of Cr2Ni2MoV and Q345B, respectively, are employed to verify the validity of LSDC method. The results show that the estimated J-resistance curves are more reasonable in comparison with those obtained by unloading compliance and normalization method.

• 出版日期2019-1
• 单位西南交通大学