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%0 Thesis
%A Heine, Luisa-Marie
%T Schadenstolerante Auslegung mit hochfestem Gusseisen EN-GJS-700-2; 1st
%V 18
%I RWTH Aachen University
%V Dissertation
%C Aachen
%M RWTH-2018-230605
%@ 978-3-8440-6318-9
%B Werkstoffanwendungen im Maschinenbau
%P 1 Online-Ressource (XII, 195 Seiten) : Illustrationen, Diagramme
%D 2018
%Z Auch veröffentlicht auf dem Publikationsserver der RWTH Aachen University
%Z Dissertation, RWTH Aachen University, 2018
%X 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.
%F PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
%9 Dissertation / PhD ThesisBook
%R 10.18154/RWTH-2018-230605
%U https://publications.rwth-aachen.de/record/750471