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Size Effect in Intermetallics: Experiments and Numerics

Raina, Arun (2019) Size Effect in Intermetallics: Experiments and Numerics. COMPLAS 2019, Barcelona, Spanien.

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Abstract

Intermetallics such as γ-Titanium Aluminide (TiAl) alloys materials are attractive replacements of currently used Nickel based super alloys in the low pressure and low temperature sections of a jet engine. TiAl alloys have better specific strength and excellent oxidation resistance compared to Nickel based super alloys. However, due to their complex microstructure sensitive macroscale mechanical response these advanced materials have not found wide acceptance in the aerospace industry until now. In this work, an investigation of the sensitivity of the fracture strength of TiAl alloys to the specimen size is performed. The observed size effect is not predicted by the classical weakest link Weibull model. The simulations of failure in TiAl are performed with the method of phase field fracture. The simulation results show that the critical fracture energy is dependent on the volume of the specimen and decreases as the volume increases. An empirical relation for this size dependent critical fracture energy is proposed in this work.

Item URL in elib:https://elib.dlr.de/133529/
Document Type:Conference or Workshop Item (Speech)
Title:Size Effect in Intermetallics: Experiments and Numerics
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Raina, ArunArun.Raina (at) dlr.dehttps://orcid.org/0000-0003-4992-2025
Date:4 September 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Intermetallics, Size effect, Phase field ductile fracture
Event Title:COMPLAS 2019
Event Location:Barcelona, Spanien
Event Type:international Conference
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: Augsburg
Institutes and Institutions:Institute of Test and Simulation for Gas Turbines > Virtual Engine and Numerical Methods
Deposited By: Raina, Dr.-Ing. Arun
Deposited On:15 Jan 2020 12:37
Last Modified:15 Jan 2020 12:37

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