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Adaption of a material model and development of a stochastic failure criterion for ceramic matrix composite structures

Becker, Thomas and Dresbach, Christian and Reh, Stefan (2016) Adaption of a material model and development of a stochastic failure criterion for ceramic matrix composite structures. Proceedings of the Institution of Mechanical Engineers Part L: Journal of Materials: Design and Applications. Sage Publications. DOI: 10.1177/1464420715592188 ISSN 1464-4207

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Abstract

Ceramic matrix composites (CMCs) show high thermal resistance combined with damage tolerance and non-brittle failure. Therefore, they are suitable for mechanically loaded components at high temperatures. For dimensioning of components, an adaption of existing simulation and calculation methods for CMC materials is required. The material investigated in this work is a wound oxide CMC with a defined fiber orientation and a highly porous matrix. Due to manufacturing conditions, randomly distributed macroscopic pores are present in the composite. Since failure is initiated by these pores, a statistical investigation of strength is performed based on the weakest link theory. Several series of tensile tests were performed to reveal the relation between stress and strain and obtain their ultimate values. The application of two statistical criteria showed that fracture strains are well represented by Weibull distributions. The tensile tests were compared with results of finite element simulations, using the simulation software ANSYS. An anisotropic Weibull criterion was set up and adapted to the results of the tensile tests. Hereby, the anisotropic nonlinear deformation behavior as well as the scatter of failure strain could be reproduced by numerical simulations. The adapted material model and failure criterion were validated by further experiments and exemplified by application in a reliability analysis of a notional flame tube.

Item URL in elib:https://elib.dlr.de/99891/
Document Type:Article
Title:Adaption of a material model and development of a stochastic failure criterion for ceramic matrix composite structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Becker, Thomast.becker (at) dlr.deUNSPECIFIED
Dresbach, Christianchristian.dresbach (at) dlr.deUNSPECIFIED
Reh, Stefanstefan.reh (at) dlr.deUNSPECIFIED
Date:May 2016
Journal or Publication Title:Proceedings of the Institution of Mechanical Engineers Part L: Journal of Materials: Design and Applications
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1177/1464420715592188
Publisher:Sage Publications
ISSN:1464-4207
Status:Published
Keywords:Ceramic matrix composite, failure criterion, Weibull, flame tube
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 - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Keramische Strukturwerkstoffe
Deposited By: Becker, Thomas
Deposited On:04 Oct 2016 11:01
Last Modified:08 Mar 2018 18:39

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