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A FINITE ELEMENT STUDY OF THE EFFECT OF CRYSTAL ORIENTATION AND MISALIGNMENT ON THE CRACK DRIVING FORCE IN A SINGLE-CRYSTAL SUPERALLOY
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
Siemens Ind Turbomachinery AB, Sweden.
Siemens Ind Turbomachinery AB, Sweden.
Siemens Ind Turbomachinery AB, Sweden.
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2016 (English)In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2016, VOL 7A, AMER SOC MECHANICAL ENGINEERS , 2016, no UNSP V07AT28A002Conference paper (Refereed)
Abstract [en]

The elastic and plastic anisotropy of the single-crystal materials bring many difficulties in terms of modeling, evaluation and prediction of fatigue crack growth. In this paper a single-crystal material model has been adopted to a finite element-environment, which is paired with a crack growth tool. All simulations are performed in a three-dimensional context. This methodology makes it possible to analyze complex finite element-models, which are more application-near than traditional two-dimensional models. The influence of the crystal orientation, as well as the influence of misalignments of the crystal orientation due to the casting process are investigated. It is shown that both the crystal orientation and the misalignment from the ideal crystal orientation are important for the crack driving force. The realistic maximum limit of 10 degrees misalignment is considered. It can be seen that crack growth behavior is highly influenced by the misalignment. This knowledge is of great interest for the industry in order to evaluate the crack growth in single-crystal components more accurately.

Place, publisher, year, edition, pages
AMER SOC MECHANICAL ENGINEERS , 2016. no UNSP V07AT28A002
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:liu:diva-132570DOI: 10.1115/GT2016-56305ISI: 000385461600011ISBN: 978-0-7918-4983-5OAI: oai:DiVA.org:liu-132570DiVA: diva2:1046659
Conference
ASME Turbo Expo: Turbine Technical Conference and Exposition
Available from: 2016-11-14 Created: 2016-11-14 Last updated: 2016-11-14

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Busse, ChristianMoverare, JohanSimonsson, KjellLeidermark, Daniel
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