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Modelling and simulation of dynamic fracture of a polycrystalline TiAl alloy under high velocity particle impact

Kabir, Rizviul (2018) Modelling and simulation of dynamic fracture of a polycrystalline TiAl alloy under high velocity particle impact. 13th World Congress in Computational Mechanics-WCCM2018, New York, USA.

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Multi-phase polycrystalline TiAl alloys show complex fracture behaviour under high velocity particle impact (HVPI). The front-side damage and back-side crack networks are found to be microstructure sensitive, which implies that the local microstructure variations of this alloy may lead to unwanted blade failure during operation. Therefore, it is important to know how these microstructures influence crack initiation and crack propagation. To this aim in the present work a numerical modelling approach has been proposed that takes into account the microstructural statistics via polycrystal modelling, and a combined damage and fracture ansatz for impact fracture behaviour. The polycrystal models were generated using Voronoi cells considering grain aspect ratio and texture. The grain boundaries were modelled applying thin cohesive layers between grains. Two types of microstructures have been studied; one with globular grains and the other with elongated grains. The material data were obtained from detail experimental work [1]. The proposed approach allows a quantitative prediction of crack networks as observed by the experiments for different TiAl microstructures. Under dynamic impact, cracks mainly propagate through grain boundaries, which have been captured using cohesive damage model. It was found that for globular grains star-shaped crack network was formed and for the elongated grains the crack extends longitudinally. The length of the crack branches can be studied for varying damage parameters at the grain boundaries. This information is useful for further analysis of fatigue life and durability of the TiAl alloy.

Item URL in elib:https://elib.dlr.de/123345/
Document Type:Conference or Workshop Item (Speech)
Title:Modelling and simulation of dynamic fracture of a polycrystalline TiAl alloy under high velocity particle impact
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:23 July 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:TiAl, Impact damage, microstructure modelling, finite element
Event Title:13th World Congress in Computational Mechanics-WCCM2018
Event Location:New York, USA
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Kabir, Dr. -Ing Mohammad Rizviul
Deposited On:20 Nov 2018 09:01
Last Modified:20 Nov 2018 09:01

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