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Investigation and modeling of creep for an all-oxide CMC

Artzt, Katia and Hackemann, Stefan and Flucht, Ferdinand and Bartsch, Marion (2015) Investigation and modeling of creep for an all-oxide CMC. 39th International Conference on Advanced Ceramics and Composites, 25.-30. Jan. 2015, Daytona, FL, USA.

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Abstract

All-oxide ceramic matrix composites represent strong candidates for high temperature applications in oxidizing atmosphere, e.g. as combustion liners in gas turbines. This material class has the advantage of inherent oxidation resistance and damage tolerance, but limitations in creep resistance exist and should be included in long-term simulations of components. Data for developing a creep simulation model were acquired in creep experiments on material with quasiunidirectional fiber architecture. Besides highly anisotropic creep behavior, a significant dependence of strain rate on fiber orientation was revealed under tensile and compressive loading. Additionally, a potential size effect in compression creep was investigated by regarding different specimen’s aspect ratio. All results were evaluated with respect to stress and temperature dependences for further usage in simulations. An approach according to Hill, describing anisotropic creep, was taken as basis and modified by an own subroutine to overcome drawbacks. Hill’s model - as available in common finite element software – does not distinguish tensile from compressive creep. The new subroutine allows for a compression to tension change in stress, as well as the development of creep anisotropy caused by cumulative strain. Experimental results from tension and compression as well as from four-point bending tests were used for input and validation of the simulation.

Item URL in elib:https://elib.dlr.de/98335/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation and modeling of creep for an all-oxide CMC
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Artzt, Katiakatia.artzt (at) dlr.deUNSPECIFIED
Hackemann, Stefanstefan.hackemann (at) dlr.deUNSPECIFIED
Flucht, Ferdinandferdinand.flucht (at) dlr.deUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Date:29 January 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:ceramic matrix composite, creep, anisotropy, numerical simulation
Event Title:39th International Conference on Advanced Ceramics and Composites
Event Location:Daytona, FL, USA
Event Type:international Conference
Event Dates:25.-30. Jan. 2015
Organizer:American Ceramic Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combusion Chamber Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Artzt, Katia Juliane
Deposited On:28 Sep 2015 08:43
Last Modified:10 May 2016 23:31

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