Influence of Microstructural Inhomogeneities on the Fatigue Crack Growth Behavior Under Very Low Amplitudes for Two Different Aluminum Alloys

Kirsten, Tina; Kuczyk, Martin; Wicke, Marcel; Brückner‐Foit, A.; Bülbül, Fatih; Christ, H.‐J.; Zimmermann, Martina

doi:10.1007/978-3-030-13980-3_39

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…Grain boundaries, twins, and precipitations form obstacles, hinder crack growth and lead to a longer crack growth phase. This effect has been proven for EN-AW 6082, where microstructural features such as large precipitates and grain boundaries had a significant effect on the crack propagation at growth rates close to the threshold region [20]. In the finer microstructure of batch two, mainly transcrystalline crack growth was observed.…”

Section: Discussionmentioning

confidence: 73%

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VHCF Behavior of Inconel 718 in Different Heat Treatment Conditions in a Hot Air Environment

Schöne

Schettler

Kuczyk

et al. 2022

Metals

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The very high cycle properties of Inconel 718 in two different heat treatment conditions were investigated at a test temperature of 500 °C. One condition was optimized for fatigue strength and displayed a finer-grained microstructure, while the second batch had a more coarse-grained microstructure. For the high-temperature ultrasonic fatigue testing, a new test concept was developed. The method is based on the principle of a hot-air furnace and thus differs from the conventionally used induction heaters. The concept could be successfully evaluated in the course of the investigations. The materials’ microstructure was analyzed before and after fatigue testing by means of metallographic and electron backscatter diffraction (EBSD)analysis. The results show a significant influence of the heat treatment on the fatigue strength caused by the specific microstructure. Further, a difference in crack propagation behavior due to microstructural influences and non-metallic precipitations was observed.

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Section: Discussionmentioning

confidence: 73%

“…In contrast to the crack initiation site's effect, precipitations are also able to slow down or even stop early crack propagation by obstacle effect, as well as grain boundaries can do [20]. These effects, which counteract crack growth, are particularly noticeable in the case of batch two.…”

Section: Discussionmentioning

confidence: 99%

VHCF Behavior of Inconel 718 in Different Heat Treatment Conditions in a Hot Air Environment

Schöne

Schettler

Kuczyk

et al. 2022

Metals

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show abstract

“…However, the effect of high frequency on fatigue has been a major focus of attention due to the use of ultrasonic fatigue tests, that may reach frequencies around 20 kHz . The main goal of these experiments is to attain high cycle fatigue (10 8 cycles) in a reasonable test time, being the dynamic effects of the loading an undesirable outcome of the test. The observed effects are diverse and often at odds.…”

Section: Introductionmentioning

confidence: 99%

Inertial effects on fatigue crack growth

Almeida

Moresco

Bittencourt

2019

Fatigue Fract Eng Mat Struct

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In this paper, a cohesive zone model is used to study the influence of inertial effects on crack growth considering cyclic loading in homogenous rate‐independent materials. Quasi‐static and dynamic solutions are compared in order to establish the conditions in which the inertial effects become important in the analysis. It is discussed how speed and frequency of the loading and specimen sizes modify crack growth characteristics. In general, an increase in the loading frequency leads to a higher propagation velocity. Very high loading frequencies may lead to the formation of microcracks ahead of the crack tip and may change the failure mode of the cracked structure from crack propagation to uniform debonding. This work shows that inertial effects are specially noticeable for frequencies in the kHz range. However, applied frequencies close to natural frequencies of the cracked specimen can give rise to strong inertial effects and then a substantial reduction of fatigue life for much lower frequencies. This work also shows that critical frequencies depend on the specimen size.

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Influence of Microstructural Inhomogeneities on the Fatigue Crack Growth Behavior Under Very Low Amplitudes for Two Different Aluminum Alloys

Cited by 2 publications

References 4 publications

VHCF Behavior of Inconel 718 in Different Heat Treatment Conditions in a Hot Air Environment

VHCF Behavior of Inconel 718 in Different Heat Treatment Conditions in a Hot Air Environment

Inertial effects on fatigue crack growth

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