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Experimental and numerical investigation of the ductile fracture of structural steel at elevated temperatures
Abstract Fracture of steel at ambient temperature has been extensively studied. Such studies developed efficient micromechanical fracture models, which can be used to predict the behaviour of steel structures and components up to failure under extreme monotonic or cyclic loading, e.g. extreme deformations due to loss of column scenarios or large earthquakes. Considerable research has been also carried out on the high-temperature fracture of steel under creep conditions but its findings have not yet been applied to structural fire engineering practice, though ductile fracture has been reported as a common mode of failure for steel structural elements under fire conditions. This paper reports results of an experimental program carried out to investigate fracture of the S275 structural steel grade at temperatures ranging from 20 °C to 450 °C. A series of tests, including tensile and shear tests, are executed to extract information on fracture of structural steel for a wide range of stress triaxiality values. Moreover, numerical simulations of the tests are carried out using MSC Marc to get further insight for the role of stress triaxiality, Lode angle parameter, and temperature. Based on both the experimental and numerical results, a fracture model proposed in the literature is calibrated to predict fracture of structural steel for the temperature range 20 °C - 450 °C.
Graphical abstract Display Omitted
Highlights The plastic response of steel is affected by the stress state. The material constants of the plasticity model depend on temperature. Stress triaxiality and Lode angle parameter affect the ductility of steel at high temperatures. The overall level of fracture strains increases at T = 450 °C.
Experimental and numerical investigation of the ductile fracture of structural steel at elevated temperatures
Abstract Fracture of steel at ambient temperature has been extensively studied. Such studies developed efficient micromechanical fracture models, which can be used to predict the behaviour of steel structures and components up to failure under extreme monotonic or cyclic loading, e.g. extreme deformations due to loss of column scenarios or large earthquakes. Considerable research has been also carried out on the high-temperature fracture of steel under creep conditions but its findings have not yet been applied to structural fire engineering practice, though ductile fracture has been reported as a common mode of failure for steel structural elements under fire conditions. This paper reports results of an experimental program carried out to investigate fracture of the S275 structural steel grade at temperatures ranging from 20 °C to 450 °C. A series of tests, including tensile and shear tests, are executed to extract information on fracture of structural steel for a wide range of stress triaxiality values. Moreover, numerical simulations of the tests are carried out using MSC Marc to get further insight for the role of stress triaxiality, Lode angle parameter, and temperature. Based on both the experimental and numerical results, a fracture model proposed in the literature is calibrated to predict fracture of structural steel for the temperature range 20 °C - 450 °C.
Graphical abstract Display Omitted
Highlights The plastic response of steel is affected by the stress state. The material constants of the plasticity model depend on temperature. Stress triaxiality and Lode angle parameter affect the ductility of steel at high temperatures. The overall level of fracture strains increases at T = 450 °C.
Experimental and numerical investigation of the ductile fracture of structural steel at elevated temperatures
Pantousa, Dafni (author) / Karavasilis, Theodore (author)
2020-11-05
Article (Journal)
Electronic Resource
English
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