Mode I fatigue crack growth at notches considering crack closure

Savaidis, Georgios; Savaidis, A.; Zerres, Patrick; Vormwald, Michael

doi:10.1016/j.ijfatigue.2010.02.010

Cited by 27 publications

(12 citation statements)

References 21 publications

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“…The DJ eff -based approach has been applied to calculate the crack growth process from the very beginning up to final fracture of a component (Savaidis et al 2010). This procedure is representative for the initiation of a technical crack at the root of mildly notched specimens or structures.…”

Section: Life Analysismentioning

confidence: 99%

Advanced Methods of Fatigue Assessment

Radaj¹,

Vormwald

2013

102

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Section: Life Analysismentioning

confidence: 99%

Advanced Methods of Fatigue Assessment

Radaj¹,

Vormwald

2013

102

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“…The crack closure and opening effects can be estimated using an elastoplastic analysis based on analytical [3,19] or numerical [13,14] approaches. Vormwald [4,5] and Savaidis et al [6,7] estimated the crack closure and opening effects proposing the use of an analytical elastoplastic analysis developed by Neuber [19] and the modified crack closure and opening model suggested by Newman Jr. [3]. The numerical elastoplastic analysis, using the finite element method, is proposed by McClung and Sehitoglu [13] and Nakagaki and Atluri [14].…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

“…Later studies determined that the quantitative parameter is dependent on max . After the proposal developed by Elber [1,2], other proposals appeared, based on elastoplastic analytical concepts [3][4][5][6][7] or the near-threshold fatigue crack growth regimes [8][9][10][11][12]. All approaches are important contributions of the crack closure and opening effects, which occur in materials when subjected to constant amplitude loading, particularly in the near-threshold regime of the fatigue crack growth.…”

Section: Introductionmentioning

confidence: 99%

Crack Closure Effects on Fatigue Crack Propagation Rates: Application of a Proposed Theoretical Model

Correia

Jesus²,

Moreira³

et al. 2016

Advances in Materials Science and Engineering

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Structural design taking into account fatigue damage requires a thorough knowledge of the behaviour of materials. In addition to the monotonic behaviour of the materials, it is also important to assess their cyclic response and fatigue crack propagation behaviour under constant and variable amplitude loading. Materials whenever subjected to fatigue cracking may exhibit mean stress effects as well as crack closure effects. In this paper, a theoretical model based on the same initial assumptions of the analytical models proposed by Hudak and Davidson and Ellyin is proposed to estimate the influence of the crack closure effects. This proposal based further on Walker’s propagation law was applied to the P355NL1 steel using an inverse analysis (back-extrapolation) of experimental fatigue crack propagation results. Based on this proposed model it is possible to estimate the crack opening stress intensity factor,Kop, the relationship betweenU=ΔKeff/ΔKquantity and the stress intensity factor, the crack length, and the stress ratio. This allows the evaluation of the influence of the crack closure effects for different stress ratio levels, in the fatigue crack propagation rates. Finally, a good agreement is found between the proposed theoretical model and the analytical models presented in the literature.

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“…Many researches have been paid attention to the development of the normalized opening stress r op /r max based on theoretical and finite element analyses [19][20][21][22][23][24][25][26]. Here, the model of r op /r max proposed by Newman [27,28] is most widely used,…”

Section: The Correction Of Da/dn $ Dk Curves In Consideration Of Cracmentioning

confidence: 99%