The most catastrophic brittle failure in ferritic steels is observed as their tendency of losing almost all of their toughness when the temperature drops below their ductile-to-brittle transition (DBT) temperature. There have been put large efforts in experimental and theoretical studies to clarify the controlling mechanism of this transition; however, it still remains unclear how to model accurately the coupled ductile=brittle fracture behavior of ferritic steels in the region of ductileto/brittle transition. Therefore, in this study, an important attempt is made to model coupled ductile/brittle fracture by means of blended micro-void and micro-cracks. To this end, a thermomechanical finite strain-coupled plasticity and continuum damage mechanics models which incorporate the blended effects of microheterogeneities in the form of micro-cracks and micro-voids are proposed. In order to determine the proposed model material constant, a set of finite element model, where the proposed unified framework, which characterizes ductile-to-brittle fracture behavior of ferritic steels, is implemented as a VUMAT, is performed by modeling the benchmark experiment given in the experimental research published by Turba et al., then, using these models as a departure point, the fracture response of the small punch fracture testing is investigated numerically at 22°C and -196°C and at which the fracture is characterized as ductile and brittle, respectively.
CITATION STYLE
Deliktas, B., Turtuk, I. C., & Voyiadjis, G. Z. (2019). Modeling temperature-driven ductile-to-brittle transition fracture in ferritic steels. In Handbook of Nonlocal Continuum Mechanics for Materials and Structures (pp. 1099–1122). Springer International Publishing. https://doi.org/10.1007/978-3-319-58729-5_6
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