Modelling of short crack propagation – Transition from stage I to stage II

Künkler, Boris; Düber, O.; Köster, Philipp; Krupp, Ulrich; Fritzen, Claus‐Peter; Christ, H.‐J.

doi:10.1016/j.engfracmech.2007.02.018

Cited by 102 publications

(51 citation statements)

References 9 publications

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“…The rationale for mesoscopic FIPs based on the deformation behaviour of individual grains corresponds well with the need to understand the driving forces behind crystallographic fatigue crack nucleation and early growth (cf. [45,46,48,66] of microstructurally small cracks.…”

Section: Role Of Microstructure In Multistage Fatiguementioning

confidence: 99%

“…Heuristic multistage modelling framework for nucleation and growth of fatigue cracks. Cycles N MSC and N PSC , respectively, represent the number of cycles to propagate the crack(s) in the regimes of micro-structurally small (normally 3-10 times the grain or second phase size/spacing) that affects retardation and undulation of the crack driving force, see inset figure (lower right) from Künkler et al [48,40], physically small crack (PSC) growth, and long crack (LC) growth. In the PSC regime, the crack is suitably long to be treated using conventional LEFM, but is still below the size considered amenable to a definition of the initial crack length for propagation analyses using LEFM.…”

Section: Role Of Microstructure In Multistage Fatiguementioning

confidence: 99%

See 1 more Smart Citation

Failure of metals II: Fatigue

Pineau¹,

McDowell²,

Busso³

et al. 2016

Acta Materialia

234

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Section: Role Of Microstructure In Multistage Fatiguementioning

confidence: 99%

Section: Role Of Microstructure In Multistage Fatiguementioning

confidence: 99%

Failure of metals II: Fatigue

Pineau¹,

McDowell²,

Busso³

et al. 2016

Acta Materialia

234

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“…It was shown that the shear stress on inactive slip systems at the crack tip increases with growing crack length [10,11].…”

Section: Modelling Of Short Fatigue Cracks 41 Short Crack Modelmentioning

confidence: 99%

Ausbreitungsverhalten mikrostrukturell kurzer Ermüdungsrisse – experimentelle Charakterisierung und mechanismenorientierte Simulation

Christ¹,

Düber²,

Knobbe³

et al. 2008

Materialwissenschaft Werkst

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In diesem Beitrag werden Ergebnisse eines interdisziplinären Forschungsprojekts präsentiert, welches die Autoren während der letzten sieben Jahren durchgeführt haben. Schlü sselworte: Ausbreitung kurzer Ermüdungsrisse, mikrostrukturelle Barrieren, Randelementemethode, virtuelle Mikrostruktur This paper presents results of an interdisciplinary research project, which was undertaken by the authors during the past seven years on the subject of experimental characterization and modelling of microstructurally short fatigue crack growth. Fatigue testing was carried out on the austenitic-ferritic duplex stainless steel X2 CrNiMoN 22 -5-3. It was shown clearly that microstructural features like grain size, phase distribution or yield stress of the grain containing the crack tip control an advancing short crack.On the basis of these findings, a mechanism-oriented model was established, which is able to simulate the growth of microstructurally short fatigue cracks in a physically reasonable way. Microstructural parameters like grain size, grain distribution, grain orientation etc. are taken into account by assigning measured values to a modelled microstructure, in which the crack growth simulation takes place. The comparison of experimentally observed and calculated values shows excellent agreement.

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“…Several researchers have focused on the study of small crack growth behavior and different small-crack test methods [1][2][3][4]; but no AE-based model for small crack growth have been offered. However, most of the success in correlating AE activities with crack growth has involved the latter stages of crack growth (Regions II and III of the crack growth curve) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Probabilistic Approach to Small Fatigue Crack Initiation and Sizing Using Acoustic Emission

Keshtgar

Modarres

2017

Preprint

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Abstract:One of the major concerns in structural health management (SHM) is the early detection of a growing crack. Using this, future damage due to crack propagation can be mitigated or eliminated by implementing proper repair and maintenance. Acoustic Emission (AE) is a non-destructive testing (NDT) method with potential applications for locating and monitoring fatigue cracks. The research presented in this paper focuses on SHM using AE. A novel AE signal analysis approach was proposed in order to detect crack initiation and assess small crack lengths. Experimental investigation indicated that initiation of a crack could be identified through the statistical analysis of the resulting features of the AE signals. A probabilistic AE-based model for small fatigue crack sizing was developed and the uncertainties of the model were estimated. In addition, a probabilistic model validation approach was implemented to confirm accurate estimation of the results. The outcome of this research can be used to evaluate the integrity of structures under fatigue loading. The proposed approach can also be applied as an approach to manage health and assess prognosis of structures.

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Modelling of short crack propagation – Transition from stage I to stage II

Cited by 102 publications

References 9 publications

Failure of metals II: Fatigue

Failure of metals II: Fatigue

Ausbreitungsverhalten mikrostrukturell kurzer Ermüdungsrisse – experimentelle Charakterisierung und mechanismenorientierte Simulation

A Probabilistic Approach to Small Fatigue Crack Initiation and Sizing Using Acoustic Emission

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