539.3 «Chemical» criterion for modeling the fatigue life of materials with different resistance to tension and compression

Dimitrienko Y. I. (Bauman Moscow State Technical University), Dimitrienko A. Y. (Lomonosov Moscow State University)

“CHEMICAL” CRITERION, FATIGUE, DURABILITY, DAMAGE ACCUMULATION, RESISTANCE DIFFERENCE, TENSION-COMPRESSION, GOODMAN DIAGRAMS


doi: 10.18698/2309-3684-2024-3-1842


The problem of developing a universal criterion for long-term fatigue strength of isotropic materials, in which the accumulation of damage differs significantly under loading in the region of tension and compression, is considered. Usually, to model the durability of such materials, Goodman diagrams are used, which take into account the dependence of durability on the load asymmetry coefficient. However, this model, as a rule, contains only one so-called S-N curve, as a result of which the fatigue life curves at different asymmetry coefficients turn out to be self-similar, which is not always observed in experimental data. In addition, Goodman diagrams are only applicable for cyclic loading. This article proposes a further development of the “chemical” criterion, which was previously developed in the author’s works, and which is applicable for a wide range of loads, both long-term static and cyclic with a random form of the loading cycle. The development of the “chemical” criterion for fatigue strength was carried out by separately taking into account the accumulation of damage in the areas of tension and compression. For mixed loading modes in the tension-compression region, a special layer accumulates damage in the tension and compression areas. A method for determining the constants of the proposed fatigue life model has been developed. It is shown how Goodman diagrams are constructed for the developed version of the fatigue life criterion. An example of using the “chemical” criterion to simulate the fatigue life of 34CrNiMo6 steel is considered.


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Димитриенко Ю.И., Димитриенко А.Ю. «Химический» критерий для моделирования усталостной долговечности материалов, разносопротивляющихся растяжению-сжатию. Математическое моделирование и численные методы, 2024, № 3, с. 18–42.



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