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Investigation and modeling of anisotropic compression creep for a unidirectional all-oxide CMC

Artzt, Katia (2014) Investigation and modeling of anisotropic compression creep for a unidirectional all-oxide CMC. ODAS 2014, 11.06.2014-13.06.2014, Köln.

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Abstract

Compression creep of WHIPOXTM, an all-oxide ceramic matrix composite, with a unidirectional fiber alignment was investigated. Experimental results showed a high creep anisotropy with lowest strain rates in case of loads applied parallel to fibers. Stress and temperature dependencies were figured out to gain essential relations for creep: Stress-sensitivity of strain rates varied with the fiber orientation having its maximum at specimens with fibers parallel to applied load. Activation energy for creep was independent of the direction of the applied load. In order to calculate material’s non-linear, time-dependent deformation behavior at high temperature, a description according to Hill on the mesoscopic scale was tested. Since creep behavior was not captured sufficiently by this model, numerical simulations on the microscopic scale were conducted. Assigning different creep parameters to fibers and matrix, more information about fiber-matrix-interactions could be obtained. Deformation mechanisms in terms of fiber rotation and the role of matrix compressibility were in focus. It appeared that matrix compaction influences deformation behavior and should not be neglected in creep description.

Item URL in elib:https://elib.dlr.de/91111/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation and modeling of anisotropic compression creep for a unidirectional all-oxide CMC
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Artzt, Katiakatia.artzt (at) dlr.deUNSPECIFIED
Date:12 June 2014
Refereed publication:No
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:compression creep, CMC, numerical modeling
Event Title:ODAS 2014
Event Location:Köln
Event Type:international Conference
Event Dates:11.06.2014-13.06.2014
Organizer:DLR und ONERA
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:04 Nov 2014 14:49
Last Modified:04 Nov 2014 14:49

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