Evaluation of the influence of surface crack-like defects on fatigue life for a P/M nickel-based superalloy FGH96

Shi, Yi; Yang, Xiaoguang; Yang, Di; Miao, Guolei; Wang, Zhifang

doi:10.1016/j.ijfatigue.2020.105639

Cited by 33 publications

(11 citation statements)

References 38 publications

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“…This area is brighter and smoother than the others. Stage II represents the fast crack propagation area, and stage III represents the final fast fracture area 43 . It can be seen that the stage I region of specimen 9 smaller than that of specimens 7 and 8.…”

Section: Results Analysismentioning

confidence: 99%

Experimental study of the strengthening effect of low amplitude loading history for a P/M nickel-based superalloy FGH96

Yang

Jiang

Shi

et al. 2022

Preprint

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The influence of preloading on the residual fatigue life of nickel-based superalloys under elevated temperatures was investigated experimentally. A powder metallurgy nickel-based superalloy FGH96 was preloaded with different number of cycles, and the residual fatigue life was tested under subsequent high-amplitude loads. The test results show that the fatigue life of the material was increased when the preloading cycle number within a specific range. At the same time, the fatigue life of virgin specimens under high-amplitude loads shows little scatter, which provides the possibility to consider the strengthening effect of low-amplitude loads. A novel damage accumulation model was proposed to incorporate the strengthening effect of low-amplitude loads into the life prediction framework. The proposed model provides better life prediction than some existing models. Finally, the proposed model was validated using experimental data for various materials under the low-high loading sequence.

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Section: Results Analysismentioning

confidence: 99%

Experimental study of the strengthening effect of low amplitude loading history for a P/M nickel-based superalloy FGH96

Yang

Jiang

Shi

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Stage II represents the fast crack propagation area, and stage III represents the final fast fracture area. 44 The stage I area of each specimen shows a semi-circle shape, which suggests that the crack initiated from the surface. Figure 9 demonstrates the crack initiation areas of the specimens with different number of preloading cycles.…”

Section: Methodsmentioning

confidence: 94%

“…The stress level and temperature of the test are based on the maximum stress level and typical temperature at the hot point in turbine discs. 44 The test temperature was 600 C, and the test was conducted in the air environment. The maximum stresses of high and low amplitude loads were designed to be the same value.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of the strengthening effect: A novel fatigue life prediction method for variable amplitude loads

Jiang,

Yang,

Shi

et al. 2023

Fatigue Fract Eng Mat Struct

Self Cite

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The strengthening effect of low‐amplitude loading at elevated temperatures was investigated experimentally. A powder metallurgy nickel‐based superalloy FGH96 was preloaded with different cycle numbers and stress levels, and the residual fatigue life was tested under subsequent high‐amplitude loads. The results show that when the number of preloading cycles is in a specific range, the residual fatigue life is higher than that of the virgin specimen under the same load. A novel damage accumulation model was proposed to incorporate the strengthening effect into the life prediction framework. The proposed model was validated using experimental results for various materials in the literature. The mechanism of the strengthening effect of FGH96 was discussed based on electron backscatter diffraction (EBSD) analysis.

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“…The majority of scientifically based approaches to assessing the degree of damage to metal structures are based on models that use the parameters of the limit sizes of crack-like defects [3], the determination of which is a complicated resource-consuming task in the case of the need to predict the durability of materials and structural elements under multi-cycle fatigue. There is a need to develop alternative methods of research that allow obtaining parameters of the limit state of damage of highly stressed metal structures regardless of the limit characteristics of local centers of destruction.…”

Section: Introductionmentioning

confidence: 99%

A methodical approach to determining the damage characteristics of cyclically loaded samples of metal structures

Pysarenko¹,

Voinalovich²,

Maylo³

et al. 2022

Tehnìka ta energetika

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The article deals with an actual task of developing engineering methods for predicting the durability of modern long-life machines should be based on the methodology for determining the degree of fatigue damage to materials and structural elements. In the development of such a methodology, the work proposes to use modern optical and computer tools that allow analyzing the parameters of the deformed surface of metal structure samples and, on this basis, to estimate the residual resource of the metal structure. The purpose of the article was to substantiate a methodical approach for determining the limit state of damage using photometric analysis of the topography of the micro-deformed surface of cyclically loaded metal structure samples. To analyze the fatigue damage characteristics of metals and alloys, an experimental information system was developed based on the method of coherent optical scanning of the deformed surface of metal structure samples with a resolution of 0.2 μm/px. The obtained specklograms of the photodiode matrix, corresponding to the two-dimensional image of the micro-deformed surface of the sample in shades of gray 0-255, were computer analyzed. This made it possible to construct diagrams of the kinetics of the process of accumulation of the amplitude of the deformation microrelief of the surface of the laboratory samples for the studied steels St 45 and St 20. It is shown that the kinetics of speckle brightness obtained in the work by the correlation method, which corresponds to the evolution of the accumulation of fatigue damage on the surface of the studied structural steel samples, is characterized by a nonlinear function, which is consistent with the results of deformation microrelief studies obtained by other methods. The proposed methodology for analyzing the discrete distribution of specklogram brightness can be used to predict the onset of the limit state of a metal structure before failure due to fatigue

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Evaluation of the influence of surface crack-like defects on fatigue life for a P/M nickel-based superalloy FGH96

Cited by 33 publications

References 38 publications

Experimental study of the strengthening effect of low amplitude loading history for a P/M nickel-based superalloy FGH96

Experimental study of the strengthening effect of low amplitude loading history for a P/M nickel-based superalloy FGH96

Experimental study of the strengthening effect: A novel fatigue life prediction method for variable amplitude loads

A methodical approach to determining the damage characteristics of cyclically loaded samples of metal structures

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