Journal
APPLIED SCIENCES-BASEL
Volume 10, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/app10207034
Keywords
ductile fracture; shear fracture; shipbuilding steel; fracture prediction; stress triaxiality; Lode angle parameter
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Funding
- Korea Research Fellowship Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2017H1D3A1A01055137]
- INHA Research Grant
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A comparison is made of the ductility limits of one mild (normal) and two high-tensile strength shipbuilding steels with an emphasis on stress state and loading path dependency. To describe the ductile fracture behavior of the considered steels accurately, an alternative form of ductile fracture prediction model is presented and calibrated. The present fracture model combines the normalized Cockcroft-Latham and maximum shear stress criterion, and is dependent on both stress triaxiality and Lode angle parameter. The calibrations indicate that, depending on the hardening characteristics of the steels, ductile fracture behavior differs considerably with stress state. It is demonstrated that the adopted fracture model is able to predict the ductile fracture initiation in various test specimens with good accuracy and is flexible in addressing the observed differences in the ductile fracture behavior of the considered steel grades.
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