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Stress-Strain-Based Approach to Catastrophic Failure of Steel Structures at Low Temperatures

  • V. M. KornevEmail author
Conference paper
First Online:
Part of the Mechanisms and Machine Science book series (Mechan. Machine Science, volume 75)

Abstract

The paper concerns propagation of cracks in structures. The coupled fracture criterion is used when plotting diagrams of quasi-brittle failure of structures made of elastic-plastic material having ultimate strain. Diagrams of quasi-brittle fracture for commonly occurring simplest components of structures just as homogeneous, so with welded joins are given. Analysis of parameters entering into the proposed model has been performed. Diagrams of quasi-brittle fracture were used in analyzing catastrophic failures of steel structure components operating at temperatures lower the cold-brittleness threshold. Parameters of the model are selected from two laboratory experiments (critical stress intensity factor and classical stress-strain diagram) performed at appropriate temperatures. It has been established that weld structures with cracks in the vicinity of a welded joint possess decreased crack toughness. The break-down effect of construction under monotonic loading is clearly expressed: critical loadings significantly decrease with increasing crack lengths. The attention is given to the parameter characterizing plastic material deformation and exhaustion of plasticity resource under preliminary plastic material deformation. After the plasticity resource is exhausted, the temperature of brittleness threshold approaches a room temperature.

Keywords

Quasi-brittle failure Elastic-plastic materials Parameters of cold-brittleness Embrittlement Ultimate strain 
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Notes

Acknowledgements

This work was supported by the Russian Science Foundation (Grant No. 19-19-00126).

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Authors and Affiliations

  1. 1.Lavrentyev Institute of Hydrodynamics, Siberian Branch of Russian Academy of SciencesNovosibirskRussia

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