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Modelling of fracture of single crystal lamellar TiAl alloys using a two-scale finite element approach

Kabir, Rizviul and Bartsch, Marion (2015) Modelling of fracture of single crystal lamellar TiAl alloys using a two-scale finite element approach. Euromec 559-Multi-scale computational methods for bridging scales in materials and structures, 23.-25. Feb. 2015, Eindhoven, NL.

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Abstract

Fracture in lamellar structure of a TiAl single crystal (known as PST crystal) has been modelled using two-scale finite element modelling approach including cohesive fracture behaviour. In this approach the representative microstructure of two-phase lamellae has been simplified in a unit cell model. The lamellar fracture, which can be interlamellar and translamellar type, has been described in the unit cells where the underlying debonding and cleavage mechanisms have been captured using cohesive damage behaviour. The macroscopic response of material failure has been calculated from the lower scale unit cell deformation and fracture behaviour. Stress-strain behaviour of undamaged state has been calculated using first order homogenization approach and the damaged behaviour has been calculated averaging the local stress-strain evolution at the damage zone after the onset of cracks as described by cohesive model. In this work we will demonstrate the proposed modelling approach for capturing micro-meso fracture with numerical examples. In addition, the cohesive model parameters for interlamellar and translamellar fracture will be estimated fitting the model response to the experimental obtained data for single crystal tensile fracture behaviour of a TiAl alloy.

Item URL in elib:https://elib.dlr.de/98351/
Document Type:Conference or Workshop Item (Poster)
Title:Modelling of fracture of single crystal lamellar TiAl alloys using a two-scale finite element approach
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kabir, Rizviulmohammad-rizviul.kabir (at) dlr.deUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Date:24 February 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Two-scale model, lamellar fracture, TiAl alloy, cohesive model
Event Title:Euromec 559-Multi-scale computational methods for bridging scales in materials and structures
Event Location:Eindhoven, NL
Event Type:Workshop
Event Dates:23.-25. Feb. 2015
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 > Experimental and Numerical Methods
Deposited By: Kabir, Dr. -Ing Mohammad Rizviul
Deposited On:28 Sep 2015 08:00
Last Modified:10 May 2016 23:31

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