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@PHDTHESIS{Heine:750471,
author = {Heine, Luisa-Marie},
othercontributors = {Broeckmann, Christoph and Münstermann, Sebastian},
title = {{S}chadenstolerante {A}uslegung mit hochfestem {G}usseisen
{EN}-{GJS}-700-2; 1st},
volume = {18},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {Shaker Verlag},
reportid = {RWTH-2018-230605},
isbn = {978-3-8440-6318-9},
series = {Werkstoffanwendungen im Maschinenbau},
pages = {1 Online-Ressource (XII, 195 Seiten) : Illustrationen,
Diagramme},
year = {2018},
note = {Auch veröffentlicht auf dem Publikationsserver der RWTH
Aachen University; Dissertation, RWTH Aachen University,
2018},
abstract = {In the course of the energy revolution, technically
reliable wind energy plants play a central role. In
particular within their nacelle, high-volume structural cast
iron components are used. Here, production-related defects
cannot be excluded. As a result, certifiers often demand a
fracture mechanically based strength assessment, in addition
to a conventional one. Thereby, it often lacks a profound
knowledge of the failure mechanisms within the material and
sophisticated design concepts. Especially for the main gear
unit’s planet carrier, manufactured out of the high
strength cast iron EN-GJS-700-2, the demand is high. This
component as well as its construction material are
consequently the present work’s subject of investigation.
The aim is the development of a damage tolerant design
concept considering all the three stages of material
fatigue: threshold behaviour, short and long crack growth.
Thereby, the solution approach comprehends experimental and
metallographic as well as numerical methods. Laws,
describing all the three stages of failure development, are
the result of the investigations. First, the threshold
behaviour is defined as a function of the defect size. This
is done in the style of the Kitagawa-Takahashi-Diagram and
of the cyclic resistance curve method. Further, functional
relationships, describing the loading conditions of typical
casting defects, are presented. They are the basis for the
quantification of the short crack growth. Here,
microstructural effects and the crack length dependent
development of crack closure are of special interest. The
latter one as well as the impact of a varying static preload
are addressed by the subsequently presented long crack
growth laws. The combination of all findings results in the
proposal of a damage tolerant design concept for
EN-GJS-700-2. It is finally validated on laboratory scale.
Thereby, in the transition region to long life fatigue, the
predictions show a great accordance with experimental
observations.},
cin = {418110},
ddc = {620},
cid = {$I:(DE-82)418110_20140620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2018-230605},
url = {https://publications.rwth-aachen.de/record/750471},
}
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