A microplasticity evaluation method in very high cycle fatigue

Wang, X.G.; Feng, Ensheng; Jiang, Chao

doi:10.1016/j.ijfatigue.2016.09.004

Cited by 33 publications

(22 citation statements)

References 54 publications

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“…Regardless the large variability in the loading history of materials in real engineering practice, researchers categorized laboratory fatigue tests into low cycle fatigue, high cycle fatigue (HCF), and very high cycle fatigue (VHCF) [1][2][3][4][5][6][7][8][9]. The latter is particularly referred to fatigue failure beyond 10 7 loading cycles [10][11][12][13]. VHCF becomes a new regime of fatigue research for the everlasting demand of faster speed and longer duration.…”

Section: Introductionmentioning

confidence: 99%

The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue

Sun

Song

Zhou

et al. 2019

International Journal of Fatigue

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While fatigue is ubiquitous and is responsible for a large proportion of failure in engineering structures, we understand little regarding the mechanism of crack initiation and early-stage crack growth especially for very high cycle fatigue (VHCF) behavior. We identified in this report the microstructural evolution during interior crack initiation and early growth in a martensitic stainless steel in VHCF regime by constant and variable amplitude loading method. We observed in the post-mortem samples after VHCF a discontinuous gradient layer composed of ultrafine grains and coarse grains in the fractured surfaces using both electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The gradient ultrafine grains are resulted from excessive cyclic plastic deformation in the vicinity of the crack origin or crack tip, which promotes the formation of crack initiation. The equivalent crack growth rate in FGA (fine granular area) is also estimated based on the "tree ring" patterns under variable amplitude loading, which is in the magnitude of 10 −12-10 −11 m/cyc.

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Section: Introductionmentioning

confidence: 99%

The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue

Sun

Song

Zhou

et al. 2019

International Journal of Fatigue

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“…By determining the corresponding scores of each grade, the weighted average of the scores of each grade is carried out, and the evaluation score is obtained. 20 The formula for calculating the evaluation score is as follows:…”

Section: Compound Operations Of Fuzzy Matrixmentioning

confidence: 99%

Evaluation method for heavy metal pollution control effect in rural areas of northern Anhui Province

Chen

Deng

2020

Asia-Pacific J Chem Eng

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Soil is an important part of human survival, and people's lives cannot be separated from soil. At present, soil pollution in China is becoming more and more serious, especially heavy metal pollution. Based on this, a method for evaluating the effect of heavy metal pollution treatment in rural areas in northern Anhui was proposed. Taking Liulangguan Lane, Nanling, and Dapu in the south of Anhui Province as the study area, the PLSR model was used to collect soil heavy metal content in the area as sample data. The fuzzy comprehensive evaluation method was used to analyze the effect of heavy metal pollution control in rural areas. The results show that most of the soil quality evaluation grades are grades 2 and 3 and need to be retreated. And the evaluation accuracy of the method is always greater than 0.9500, and the evaluation results are more credible.

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“…The predominant proportion of 90% to 95% of the deformation energy dissipates as heat, which is why the temperature change can be correlated directly with the plastic deformation or the cumulative damage. 2,3 Through the very good heat conductivity of metallic materials, the change in temperature, which is related to the dissipated heat energy, can be measured on the specimens' surface. Over the past decades, thermographic measurements have already been widely used along fatigue tests as a nondestructive testing (NDT) method mainly in view of determining fatigue properties.…”

Section: Introductionmentioning

confidence: 99%

Thermography in high cycle fatigue short‐term evaluation procedures applied to a medium carbon steel

Teng

Boller

et al. 2019

Fatigue Fract Eng Mat Struct

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This paper focuses on the fatigue life calculation for an unalloyed medium carbon steel SAE1045 (German DIN-standard: C45E), by applying an energy dissipation-based approach quantified through thermographic measurements. The purpose of this approach is to establish an intrinsic dissipation model and to predict characteristics derived from the cyclic deformation behavior of stress-controlled fatigue tests, eg, the fatigue limit and the S-N data by using simplified (zero-dimensional, 0D) thermodynamic equations. In order to investigate the possibilities for a rapid evaluation while simultaneously reducing the experimental effort, one load increase test (LIT) and two constant amplitude tests (CATs) were carried out. The S-N data evaluated on such a basis is competitive to conventionally determined S-N data as will be shown. K E Y W O R D Sfatigue life evaluation, intrinsic dissipation, medium carbon steel, thermography

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A microplasticity evaluation method in very high cycle fatigue

Cited by 33 publications

References 54 publications

The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue

The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue

Evaluation method for heavy metal pollution control effect in rural areas of northern Anhui Province

Thermography in high cycle fatigue short‐term evaluation procedures applied to a medium carbon steel

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