{"title":"Relation between Stresses for the Boundaries of Scale Levels of the Fatigue Diagram and Difference of the Meso- and Macroscale Fracture Mechanisms","authors":"A. A. Shanyavskiy, A. P. Soldatenkov","doi":"10.1134/s1029959924030032","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Statistical data analysis was performed based on the results of standard tests with metallic materials. The relation was found between the so-called fatigue limit, which is considered as the boundary between micro- and mesoscale fatigue fracture processes, and mechanical characteristics under monotonic tension. Using heat-resistant alloy EI698 and titanium alloy VT22 as examples, it was shown that the mechanisms of fatigue crack initiation and growth in materials with different ratios of fatigue limit to yield stress are different. The mechanism of slip band formation determines the fatigue crack initiation and its early growth stage for materials with the σ<sub>–1</sub>/σ<sub>0.2</sub> ratio close to 1 and higher, as was shown for EI698. For materials with the σ<sub>–1</sub>/σ<sub>0.2</sub> ratio below 1, the fatigue crack initiation is associated with mechanisms other than slipping, as demonstrated for VT22.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Mesomechanics","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1134/s1029959924030032","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
引用次数: 0
Abstract
Statistical data analysis was performed based on the results of standard tests with metallic materials. The relation was found between the so-called fatigue limit, which is considered as the boundary between micro- and mesoscale fatigue fracture processes, and mechanical characteristics under monotonic tension. Using heat-resistant alloy EI698 and titanium alloy VT22 as examples, it was shown that the mechanisms of fatigue crack initiation and growth in materials with different ratios of fatigue limit to yield stress are different. The mechanism of slip band formation determines the fatigue crack initiation and its early growth stage for materials with the σ–1/σ0.2 ratio close to 1 and higher, as was shown for EI698. For materials with the σ–1/σ0.2 ratio below 1, the fatigue crack initiation is associated with mechanisms other than slipping, as demonstrated for VT22.
期刊介绍：
The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.
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