SYMPOSIA PAPER Published: 01 January 2000
STP14805S

Local Approach to Dynamic Fracture Toughness Evaluation

Source

Fracture toughness properties of structural steels of 490-MPa strength class and weld metals under dynamic loading are studied in the light of the near crack tip stress fields. The loading rate in toughness tests range from 0.1 to 500 mm/s. The near-tip stress fields are analyzed by 3D-FEM considering the strain rate effect on the flow properties of materials. Temperature rise caused by high-speed plastic deformation is also included in the FE analysis. The critical CTOD at brittle fracture initiation decreases when increasing the loading rate. This is due to the elevation of a local stress near the crack tip. The local approach is applied to the dynamic fracture toughness evaluation. It is shown that the brittle fracture resistance evaluated in terms of the Weibull stress, an integrated stress over a highly stressed region near the crack tip, is a material property independent of the loading rate. Based on the Weibull stress fracture criterion, the dynamic fracture toughness can be predicted from static toughness results. An engineering procedure to estimate the loading rate effect on the fracture toughness is also presented.

Author Information

Minami, F
Graduate School of Engineering, Osaka University, Osaka, Japan
Ochiai, T
Katayama Stratech Corporation, Osaka, Japan
Hashida, T
Katayama Stratech Corporation, Osaka, Japan
Arimochi, K
Corporate Research and Development Laboratories, Sumitomo Metal Industries Ltd., Amagasaki, Japan
Konda, N
Corporate Research and Development Laboratories, Sumitomo Metal Industries Ltd., Amagasaki, Japan
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Details
Developed by Committee: E08
Pages: 271–304
DOI: 10.1520/STP14805S
ISBN-EB: 978-0-8031-5437-7
ISBN-13: 978-0-8031-2868-2