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Fatigue strength of titanium matrix composites depending on fibre volume content and fibre orientation

Hausmann, Joachim (2007) Fatigue strength of titanium matrix composites depending on fibre volume content and fibre orientation. In: Euromat 2007. Euromat 2007, 2007-09-10 - 2007-09-13, Nürnberg, Germany.

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Abstract

SiC-fibre reinforced titanium matrix composites are marked by exceptional high specific strength and stiffness at temperatures up to 550°C. That is why these materials are considered as promising materials for components of future aeronautic gas turbines. Tensile and fatigue properties have been investigated precisely in the past. The influence of fibre volume content and fibre orientation on the fatigue strength has been investigated less systematically. The tensile strength of titanium matrix composites under loading in fibre direction can be predicted appropriate by the rule of mixture. For fatigue loading the mechanism is more complex; especially in the high cycle fatigue regime. Residual stresses and matrix cracks bridged by fibres are influencing the behaviour significantly. The reinforcing effect of high fibre volume contents diminishes with increasing number of cycles to failure. Four different fibre volume contents between 25% and 58% were investigated experimentally. In the low cycle fatigue region the strengths are marked by the fibre volume content while the strengths in the high cycle fatigue region beyond 100,000 cycles become more and more similar. This behaviour can be understood by an analytical model which will be presented, too. Fatigue loading transverse to the fibre direction leads to a relatively low level of strength which is about one third of the unreinforced matrix alloy. However, many intended applications require high strength in one loading direction. Thus, the transverse fatigue strength is still sufficient. The results of transverse fatigue tests were compared with the longitudinal fatigue tests.

Document Type:Conference or Workshop Item (Speech)
Title:Fatigue strength of titanium matrix composites depending on fibre volume content and fibre orientation
Authors:
AuthorsInstitution or Email of Authors
Hausmann, JoachimUNSPECIFIED
Date:10 September 2007
Journal or Publication Title:Euromat 2007
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:titanium matrix composite (tmc), fatigue, fibre volume content
Event Title:Euromat 2007
Event Location:Nürnberg, Germany
Event Type:international Conference
Event Dates:2007-09-10 - 2007-09-13
Organizer:DGM, FEMS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Light Metal Composites
Deposited By: Dr.-Ing. Joachim Hausmann
Deposited On:09 Jan 2008
Last Modified:27 Apr 2009 14:36

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