Topic
Fatigue limit
About: Fatigue limit is a research topic. Over the lifetime, 20489 publications have been published within this topic receiving 305744 citations. The topic is also known as: endurance limit & fatigue strength.
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TL;DR: In this paper, the authors reveal extraordinary fatigue resistance in nanocrystalline (NC) alloys, which appears to be associated with the small ( 107 cycles to failure) crack initiation site.
Abstract: Fatigue failure due to repetitive loading of metallic devices is a pervasive engineering concern. The present work reveals extraordinary fatigue resistance in nanocrystalline (NC) alloys, which appears to be associated with the small ( 107 cycles to failure). Postmortem examinations show that failed samples contain an aggregate of coarsened grains at the crack initiation site. The experimental data and accompanying microscopy suggest that the NC matrix undergoes abnormal grain growth during cyclic loading, allowing dislocation activity to persist over length scales necessary to initiate a fatigue crack by traditional fatigue mechanisms. Thus, the present observations demonstrate anomalous fatigue behavior in two regards: (1) quantitatively anomalous when considering the extremely high stress levels needed to drive fatigue failure and (2) mechanistically anomalous in light of the grain growth process that appears to be a necessary precursor to crack initiation.
90 citations
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TL;DR: In this paper, the influence of strength level and loading frequency on the fatigue behavior in very high-cycle regime was investigated on a bearing steel, which were quenched and tempered at 150 degrees, 300 degrees, 450 degrees, and 600 degrees C, respectively.
90 citations
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90 citations
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TL;DR: A significant finding is that the fatigue strengths of HP-Mg, Mg-1Ca and Mg -2Zn-0.2Ca are all around 90MPa in air but 52MPa, 70MPa and 68 MPa in SBF at 4×10(6)cycles, which will provide the first-hand data for the future magnesium implants design.
90 citations
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TL;DR: In this article, the physical and statistical aspects of structural fatigue have been discussed, and the increase of design stresses resulting from the use of metal of increasing static strength but decreasing relative fatigue resistance has reduced the fatigue life of aircraft structures by approximately four orders of magnitude.
Abstract: Publisher Summary This chapter discusses the physical and statistical aspects of fatigue Structural fatigue has established itself as a major factor in modern aircraft design The increase of design stresses resulting from the use of metal of increasing static strength but decreasing relative fatigue resistance has reduced the fatigue life of aircraft structures by approximately four orders of magnitude In conventional fatigue tests, at constant stress amplitude, the range of variation of number of cycles to failure is at least one, more frequently two, occasionally even three orders of magnitude The fatigue crack progresses quickly under a high intensity of the cyclic force, but take years to develop under low force amplitude An inverse relation exists between the force or deformation amplitude and their specific intensities expressed in terms of nominal stress or strain and the “fatigue life”—the number of repetitions of the stress or strain cycle producing fractures at the applied amplitude The fatigue life of a material at a given stress amplitude and mean stress is controlled by a number of variables defining the structure of the material, the geometry and size of the specimen, and the properties of its surface and of its environment
90 citations