Short fatigue crack behaviour under low cycle fatigue regime

Hutař, Pavel; Poduška, Jan; Šmíd, Miroslav; Kuběna, Ivo; Chlupová, Alice; Náhlík, Luboš; Polák, Jaroslav; Kruml, Tomáš

doi:10.1016/j.ijfatigue.2017.06.002

Cited by 16 publications

(18 citation statements)

References 19 publications

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“…The crack growth rates of individual short cracks show considerable scatter, and therefore the “equivalent crack” has been introduced to characterize the growth of a typical largest crack at the applied plastic strain amplitude. The dependence of the crack growth rates on the plastic strain amplitude in low cycle fatigue domain is in accord with the Manson‐Coffin law while the dependence on the range of J integral represents general yield fracture mechanics approach to the analysis of the short crack growth …”

Section: Introductionmentioning

confidence: 72%

“…It has been demonstrated several times that crack growth of short cracks cannot be correlated with the parameters of linear elastic fracture mechanics. Stress and strain fields of short cracks under elasto‐plastic loading can be described using the J integral .…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the growth of short fatigue cracks under the large scale yielding has been related to the range of J integral ΔJ . Recently, Hutař et al evaluated ΔJ and its elastic and plastic components using numerical analyses and found that the growth rates of short cracks are better correlated with the plastic part of the J integral ΔJ p . However, most of the results were obtained by measuring the cracks initiated from the prefabricated notch or using long cracks.…”

Section: Discussionmentioning

confidence: 99%

“…The dependence of the crack growth rates on the plastic strain amplitude in low cycle fatigue domain is in accord with the Manson-Coffin law 4 while the dependence on the range of J integral represents general yield fracture mechanics approach to the analysis of the short crack growth. 36 In Sanicro 25 steel low cycle fatigue behavior 39 and dislocation structure evolution 40 during cyclic plastic straining at ambient and elevated temperature have been recently reported. Surface profile evolution leading to fatigue crack initiation 18,41,42 was also thoroughly studied.…”

Section: Introductionmentioning

confidence: 98%

“…Studies of crack growth in austenitic and austenitic-ferritic steels 30,[35][36][37][38] revealed that fatigue crack growth rates strongly depend on the applied plastic strain amplitude. In elastoplastic cyclic loading, multiple cracks are initiated and grow simultaneously.…”

Section: Introductionmentioning

confidence: 99%

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Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel

Mazánová

Polák

2018

Fatigue Fract Eng Mat Struct

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Austenitic heat‐resistant stainless steel Sanicro 25, often used in energy production installations, was cyclically strained at room temperature, and initiation and growth of short fatigue cracks have been studied. Cylindrical specimens with pre‐existing shallow notch were cyclically strained under constant total strain amplitudes, while the surface relief, crack initiation, and short crack growth were observed, in‐situ, using optical and electron microscopes. Persistent slip markings were found to be the principal locations where natural fatigue cracks initiated. The character of the crack paths of short cracks was studied using SEM and EBSD techniques. The results exhibit prevailing transgranular crack growth, ie, along the persistent slip markings within the grains. The growth of the largest cracks in the central part of the shallow notch was measured for different applied strain amplitudes. Because the coalescence of initiated cracks plays a significant role during crack growth, the use of the “equivalent crack” concept gives adequate results in the description of the crack growth rate. The crack growth law of short cracks was established and compared with the Manson‐Coffin law of the material.

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Section: Introductionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel

Mazánová

Polák

2018

Fatigue Fract Eng Mat Struct

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Recent Developments in Fatigue Assessment of Ships and Offshore Structures

Dong

Garbatov

Soares

2022

J. Marine. Sci. Appl.

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A review is provided of various approaches that have been adopted recently to assess the fatigue of ships and offshore structures. The relevant fatigue loading is reviewed first, focusing on the successive loading and unloading of the cargo and the transient loadings. The factors influencing fatigue strength are discussed, including the geometrical parameters, material, residual stress, and ones related to the environment. Different approaches for fatigue analyses of seam-welded joints are covered, i.e., the structural stress or strain approach, the notch stress or strain approach, notch intensity approach, and the crack propagation approach.

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