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Criteria evaluation for the transition of cracking modes in a single-crystal nickel-base superalloy
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-1688-9732
Siemens Ind Turbomachinery AB, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Siemens Ind Turbomachinery AB, Sweden.
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2020 (English)In: Theoretical and applied fracture mechanics (Print), ISSN 0167-8442, E-ISSN 1872-7638, Vol. 106, article id 102453Article in journal (Refereed) Published
Abstract [en]

Single-crystal nickel-base superalloys frequently experience two distinct fatigue crack growth modes. It has been observed that, under certain conditions, cracks transition from a path perpendicular to the loading direction to a crystallographic slip plane. As crystallographic cracking is associated with an increased fatigue crack growth rate, it is important to be able to predict when this transition occurs. In this work three different criteria for crystallographic cracking based on resolved anisotropic stress intensity factors are evaluated in a three-dimensional finite element context. The criteria were calibrated and evaluated using isothermal fatigue experiments on two different specimen geometries. It is suggested by the results, that a threshold value of a resolved shear stress intensity factor can act as a conservative criterion indicating cracking mode transition. Further, a trend hinting towards a loading frequency dependency could be observed.

Place, publisher, year, edition, pages
ELSEVIER , 2020. Vol. 106, article id 102453
Keywords [en]
Single-crystal nickel-base superalloys; Finite element analysis; Fracture mechanics; Resolved stress intensity factor; Crystallographic cracking
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-164998DOI: 10.1016/j.tafmec.2019.102453ISI: 000519657500033OAI: oai:DiVA.org:liu-164998DiVA, id: diva2:1422734
Note

Funding Agencies|Linkoping University; Siemens Industrial Turbomachinery AB

Available from: 2020-04-08 Created: 2020-04-08 Last updated: 2022-04-01

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