Additional evidence for the plastic blunting process of fatigue crack propagation

Laird, C.; Veaux, R. de la

doi:10.1007/bf02676989

Cited by 38 publications

(9 citation statements)

References 9 publications

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“…Stage II: Crack propagation (d) The plastic blunting process [24][25][26][27] has asymmetrical effects in the tensile and compressive loading cycles. This mechanism describes crack-growth behaviour in one loading cycle.…”

Section: Established Principles In the Literaturementioning

confidence: 99%

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Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Liú

Pons

2018

Metals

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Background-Creep-fatigue damage is generally identified as the combined effect of fatigue and creep. This behaviour is macroscopically described by crack growth, wherein fatigue and creep follow different principles. Need-Although the literature contains many studies that explore the crack-growth path, there is a lack of clear models to link these disparate findings and to explain the possible mechanisms at a grain-based level for crack growth from crack initiation, through the steady stage (this is particularly challenging), ending in structural failure. Method-Finite element (FE) methods were used to provide a quantitative validation of the grain-size effect and the failure principles for fatigue and creep. Thereafter, a microstructural conceptual framework for the three stages of crack growth was developed by integrating existing crack-growth microstructural observations for fatigue and creep. Specifically, the crack propagation is based on existing mechanisms of plastic blunting and diffusion creep. Results-Fatigue and creep effects are treated separately due to their different damage principles. The possible grain-boundary behaviours, such as the mismatch behaviour at grain boundary due to creep deformation, are included. The framework illustrates the possible situations for crack propagation at a grain-based level, particularly the situation in which the crack encounters the grain boundary. Originality-The framework is consistent with the various creep and fatigue microstructure observations in the literature, but goes further by integrating these together into a logically consistent framework that describes the overall failure process at the microstructural level.

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Section: Established Principles In the Literaturementioning

confidence: 99%

“…The crack-growth process of creep fatigue is mainly discussed under the second stage of crack growth, and this discussion is based on the idea of the plastic blunting process [24][25][26][27].…”

Section: Stage Ii: Crack Propagationmentioning

confidence: 99%

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Liú

Pons

2018

Metals

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“…8(d), the transgranular crack propagation is attributed to crack blunting and the re-sharpening mechanism. 18,19) In fact, these propagation behaviors are same as those of the Fe-0.017C steels.…”

Section: Fatigue Crack Propagation and Non-propagationmentioning

confidence: 53%

Fatigue Behavior in an Fe–N Binary Ferritic Steel: Similarity and Difference between Carbon and Nitrogen

et al. 2019

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Fatigue crack initiation and propagation behavior of a water-quenched fully ferritic nitrogen steel were investigated by means of tension-compression fatigue tests. The Fe-0.011 mass% N steel showed no serrated flow associated with dynamic strain aging, and showed a fatigue limit of 150 MPa alongside a non-propagating fatigue crack. The major mode of crack initiation was at the grain boundaries, and the cracks propagated along the grain boundaries and interiors at and above the fatigue limit. The Fe-N steel did not exhibit a significant level of coaxing effect. The results were compared with our previous findings in Fe-0.006 and 0.017C steels, and the similarity and difference were discussed.

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“…In contrast, the fatigue striation observed in Fig. 9(b) is evidence of the occurrence of crack blunting and resharpening, 35,36) indicating that transgranular propagation as the rest of the propagation path can be explained by the conventional mechanism. Thus, both repeated crack initiation and the conventional mechanism are responsible for crack propagation in the investigated steel.…”

Section: Resultsmentioning

confidence: 85%

“…It is likely that intergranular crack propagation occurs owing to the repeated initiation of cracks and their coalescence, which is associated with plastic strain localization at the crack tips, and not because of successive crack blunting and resharpening. 35,36) In other words, the intergranular cracking stems from strain-induced damage formation, not from slip-related change of the crack shape. This is because grain boundaries do not have a specific geometrical relationship with slip deformation, which is required for the blunting and resharpening of cracks.…”

Section: Resultsmentioning

confidence: 99%

Intergranular Fatigue Crack Initiation and Its Associated Small Fatigue Crack Propagation in Water-quenched Fe–C Fully Ferritic Steel

Koyama

Yoshida

et al. 2015

ISIJ Int.

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Additional evidence for the plastic blunting process of fatigue crack propagation

Cited by 38 publications

References 9 publications

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Fatigue Behavior in an Fe–N Binary Ferritic Steel: Similarity and Difference between Carbon and Nitrogen

Intergranular Fatigue Crack Initiation and Its Associated Small Fatigue Crack Propagation in Water-quenched Fe–C Fully Ferritic Steel

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