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01-03-2013 | SCIENTIFIC AND TECHNICAL SECTION

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

Authors: B. Z. Margolin, A. A. Sorokin

Published in: Strength of Materials | Issue 2/2013

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Abstract

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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Title: A Physical-Mechanical Model of Ductile Fracture in Irradiated Austenitic Steels
Authors: B. Z. Margolin
A. A. Sorokin
Publication date: 01-03-2013
Publisher: Springer US
Published in: Strength of Materials / Issue 2/2013
Print ISSN: 0039-2316
Electronic ISSN: 1573-9325
DOI: https://doi.org/10.1007/s11223-013-9440-7

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