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A Physical-Mechanical Model of Ductile Fracture in Irradiated Austenitic Steels

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Strength of Materials Aims and scope

We present the equations that describe nucleation and growth of voids in austenitic steels during deformation under various stress-state triaxiality ratios. The authors put forward a criterion of fracture due to void merging through the plastic instability mechanism in a void-containing material or through the channel mechanism, i.e., shearing of bridges between voids. The equations include two void populations – the deformation-caused voids and the vacancy voids that arise during irradiation and result in the irradiation-induced swelling. The authors perform modeling of the influence of various factors (test temperature, neutron irradiation dose, stress-state triaxiality, irradiation-induced swelling) on plasticity and fracture toughness of material. The calculated results are compared to experimental findings. The influence of the stress-state triaxiality on plasticity of an irradiated material has been clarified. A relation has been found between the strain hardening parameters and plasticity, fracture toughness of material.

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  1. Federal State Unitary Enterprise Central Research Institute of Structural Materials “Prometey”, St. Petersburg, Russia

    B. Z. Margolin & A. A. Sorokin

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  1. B. Z. Margolin
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  2. A. A. Sorokin
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Translated from Problemy Prochnosti, No. 2, pp. 5 – 30, March – April, 2013.

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Margolin, B.Z., Sorokin, A.A. A Physical-Mechanical Model of Ductile Fracture in Irradiated Austenitic Steels. Strength Mater 45, 125–143 (2013). https://doi.org/10.1007/s11223-013-9440-7

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