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Estimation of failure strain of EH36 high strength marine structural steel using average stress triaxiality
Abstract We describe the theoretical background of fracture phenomena in marine structural steels and provide a failure strain criterion for EH36, one of the most popular polar class steels, based on experimental and numerical investigations. Various fracture criteria are theoretically investigated including shear failure criteria such as constant/variable failure strain and forming limit diagram failure strain, porosity failure criterion, and damage failure criterion. Based on our theoretical evaluation, we suggest that stress triaxiality is a key index that can be used to determine fracture phenomena for ductile metals. A new criterion to predict ductile fracture is proposed based on tensile tests of notched specimens and numerical simulations for EH36 high strength marine structural steel. We prove that stress triaxiality is one of the important factors governing material failure. Instead of using local stress triaxiality, this paper introduces critical strain energy concept and corresponding average failure stress triaxiality. It is proved that EH36 high strength steel well obeys a failure strain curve with 100% critical energy in a limited average failure stress triaxiality zone from 0.5 to 1.0.
Highlights ► Theoretical failure models are reviewed. ► Fracture tests are carried out for various notched specimens. ► Average stress triaxilaity and critical energy are introduced. ► A new formula for failure strain is proposed.
Estimation of failure strain of EH36 high strength marine structural steel using average stress triaxiality
Abstract We describe the theoretical background of fracture phenomena in marine structural steels and provide a failure strain criterion for EH36, one of the most popular polar class steels, based on experimental and numerical investigations. Various fracture criteria are theoretically investigated including shear failure criteria such as constant/variable failure strain and forming limit diagram failure strain, porosity failure criterion, and damage failure criterion. Based on our theoretical evaluation, we suggest that stress triaxiality is a key index that can be used to determine fracture phenomena for ductile metals. A new criterion to predict ductile fracture is proposed based on tensile tests of notched specimens and numerical simulations for EH36 high strength marine structural steel. We prove that stress triaxiality is one of the important factors governing material failure. Instead of using local stress triaxiality, this paper introduces critical strain energy concept and corresponding average failure stress triaxiality. It is proved that EH36 high strength steel well obeys a failure strain curve with 100% critical energy in a limited average failure stress triaxiality zone from 0.5 to 1.0.
Highlights ► Theoretical failure models are reviewed. ► Fracture tests are carried out for various notched specimens. ► Average stress triaxilaity and critical energy are introduced. ► A new formula for failure strain is proposed.
Estimation of failure strain of EH36 high strength marine structural steel using average stress triaxiality
Choung, Joonmo (author) / Shim, Chun-Sik (author) / Song, Ha-Cheol (author)
Marine Structures ; 29 ; 1-21
2012-08-07
21 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2012
Atmospheric Corrosion Resistance of EH36 Ocean Platform Steel
| British Library Online Contents | 2012