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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, 2018-07-22 - 2018-07-27, New York, USA.

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Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/123345/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Modelling and simulation of dynamic fracture of a polycrystalline TiAl alloy under high velocity particle impact
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Kabir, Rizviulmohammad-rizviul.kabir (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:23 Juli 2018
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:TiAl, Impact damage, microstructure modelling, finite element
Veranstaltungstitel:13th World Congress in Computational Mechanics-WCCM2018
Veranstaltungsort:New York, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:22 Juli 2018
Veranstaltungsende:27 Juli 2018
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Experimentelle und numerische Methoden
Hinterlegt von: Kabir, Dr. -Ing Mohammad Rizviul
Hinterlegt am:20 Nov 2018 09:01
Letzte Änderung:11 Jun 2024 08:31

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