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<p>To establish the regularities of fatigue crack growth in structural steels, cyclic crack resistance studies were performed on specimens in the form of a double-cantilever beam (DCB), and an interpretation of the results obtained based on bi-criterial fracture assessment diagrams was proposed. The concept of the <i>K</i><sub><i>I</i></sub>-controlled process is introduced, which reflects the deformation of the specimen in its mass linearly-elastically in accordance with the criteria of linear fracture mechanics. The effect of significant applied amplitude forces in DCB specimens of small thicknesses and relatively short initial cracks, made of both 5KhNM steel and EP921 (03Kh9K14H6M3DF-VD) steel, was observed in the form of an extreme scatter of experimental data for the left (first) section of the kinetic diagram of fatigue crack growth and is explained by a plastic <i>P</i><sub><i>LL</i></sub>-controlled or mixed (bi-criterial with coexisting <i>K</i><sub><i>I</i></sub>- and <i>P</i><sub><i>LL</i></sub>-controlled processes of fatigue crack growth. A set of studies was carried out on the chemical composition, mechanical properties, fracture toughness, and cyclic crack resistance characteristics of 5KhNM and EP921 steels used in the production of gas static unit housings, and an approach was proposed for engineering assessment of the residual durability of the structure at the design stage.</p>

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Bi-Criterial Interpretation of Fatigue Crack Growth. Part 1. Investigation of Fatigue Crack Growth in Double-Cantilever Beam Specimens

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • V. M. Torop

摘要

To establish the regularities of fatigue crack growth in structural steels, cyclic crack resistance studies were performed on specimens in the form of a double-cantilever beam (DCB), and an interpretation of the results obtained based on bi-criterial fracture assessment diagrams was proposed. The concept of the KI-controlled process is introduced, which reflects the deformation of the specimen in its mass linearly-elastically in accordance with the criteria of linear fracture mechanics. The effect of significant applied amplitude forces in DCB specimens of small thicknesses and relatively short initial cracks, made of both 5KhNM steel and EP921 (03Kh9K14H6M3DF-VD) steel, was observed in the form of an extreme scatter of experimental data for the left (first) section of the kinetic diagram of fatigue crack growth and is explained by a plastic PLL-controlled or mixed (bi-criterial with coexisting KI- and PLL-controlled processes of fatigue crack growth. A set of studies was carried out on the chemical composition, mechanical properties, fracture toughness, and cyclic crack resistance characteristics of 5KhNM and EP921 steels used in the production of gas static unit housings, and an approach was proposed for engineering assessment of the residual durability of the structure at the design stage.