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On the definition of the local brittle fracture criterion to predict the crack resistance of high-strength steel
https://doi.org/10.22349/1994-6716-2020-103-3-114-134
Abstract
The use of local brittle fracture criteria for predicting the crack resistance of low-alloy steels is a generally accepted approach. The paper analyzes the possibility of its use for experimental melts of highstrength low-alloy steel sheets with yield strength of about 1000 MPa, the structural state of which was previously studied. Cylindrical specimens with an annular notch of three types differing in the stress-strain state in the net cross-section were tested. It is found that the use of the simplest formulation of such a criterion in the form of an energy condition for the propagation of microcracks through structural barriers (large-angle grain boundaries) gives acceptable results for notched specimens made of metal with different grain sizes, and allows linking these results with the crack resistance of the studied materials.
Keywords
Supporting agencies: Experimental studies were performed on the equipment of the Center for Collective Use “Composition, Structure and Properties of Structural and Functional Materials” of the NRC “Kurchatov Institute” – CRISM “Prometey”.
About the Authors
A. V. Ilyin
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Dr Sc. (Eng)
49 Shpalernaya St, 191015 St Petersburg
A. A. Lavrentiev
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
A. V. Mizetsky
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
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Review
For citations:
Ilyin A.V., Lavrentiev A.A., Mizetsky A.V. On the definition of the local brittle fracture criterion to predict the crack resistance of high-strength steel. Voprosy Materialovedeniya. 2020;(3(103)):114-134. (In Russ.) https://doi.org/10.22349/1994-6716-2020-103-3-114-134
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