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ANISOTROPIC CREEP BEHAVIOR OF A UNIDIRECTIONAL ALL-OXIDE CMC

Artzt, Katia and Hackemann, Stefan and Flucht, Ferdinand and Bartsch, Marion (2014) ANISOTROPIC CREEP BEHAVIOR OF A UNIDIRECTIONAL ALL-OXIDE CMC. In: 38th International Conference and Exposition on Advanced Ceramics and Composites (ICACC). The American Ceramic Society. 38th Int'l Conf & Expo on Advanced Ceramics & Composites (ICACC 2014), 26.-31. Jan. 2014, Daytona Beach, FL, USA.

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Abstract

This paper is intended to give an overview of the creep behavior of unidirectional porous all-oxide CMC including experimental results as well as numerical simulations. The creep behavior was investigated by means of creep tests proving a tension- compression asymmetry. For compression creep, stress and temperature dependencies were determined and described by power-law creep equations. Activation energy was similar for all fiber orientations whereas the stress exponent differed with respect to the loading direction. Thus, for modeling the creep behavior of CMC lamina anisotropic creep must be taken into account. Within commercial finite element software implemented anisotropic creep laws are rare. The anisotropic approach according to Hill was tested for compression creep with regard to the applicability and limitations for CMCs. Since the Hill-approach did not capture the experimental results sufficiently, compression creep was further investigated by simulations on a microscopic scale via unit cells. Thereby the effect of different creep parameters for fibers and matrix and the resulting lamina’s deformation rate could be investigated. It became apparent that additionally compaction of the porous matrix has to be included in the numerical description.

Item URL in elib:https://elib.dlr.de/91622/
Document Type:Conference or Workshop Item (Speech)
Title:ANISOTROPIC CREEP BEHAVIOR OF A UNIDIRECTIONAL ALL-OXIDE CMC
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Artzt, Katiakatia.artzt (at) dlr.deUNSPECIFIED
Hackemann, Stefanstefan.hackemann (at) dlr.deUNSPECIFIED
Flucht, FerdinandDLRUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Date:30 January 2014
Journal or Publication Title:38th International Conference and Exposition on Advanced Ceramics and Composites (ICACC)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Gyekenyesi, AndrewUNSPECIFIED
Halbig, MichaelUNSPECIFIED
Publisher:The American Ceramic Society
Series Name:Ceramic Engineering and Science Proceedings
Status:Published
Keywords:ceramic matrix composites (CMCs), creep, anisotropy, numerical simulation
Event Title:38th Int'l Conf & Expo on Advanced Ceramics & Composites (ICACC 2014)
Event Location:Daytona Beach, FL, USA
Event Type:international Conference
Event Dates:26.-31. Jan. 2014
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:06 Nov 2014 10:23
Last Modified:06 Nov 2014 10:23

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