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Fracture behaviour of Alloy 718 at high strain rates, elevated temperatures, and various stress triaxialities
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials. (Solid Mechanics)ORCID iD: 0000-0002-5351-9338
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials. (Solid Mechanics)
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials. (Solid Mechanics)
(English)Manuscript (preprint) (Other academic)
Abstract [en]

A methodology for fracture characterisation at strain rates up to 1000 s􀀀1, temperatures up to 650 C, and variousstress triaxialities is presented. High-speed photography combined with digital image correlation is used to evaluatethe strain at fracture. The methodology was successfully demonstrated on aged nickel based Alloy 718, commonlyused in the containment structure of aircraft engines. Tensile specimens with four dierent geometries were loadedto get a wide range of positive stress triaxialities. All specimens originated from one single heat and batch to ensureconsistent mechanical properties. The results showed evident stress state dependency on the failure strain, wherelower failure strains were observed at higher stress triaxialities for all combinations of temperatures and strain rates.A coupled relationship between the temperature and the stress triaxiality controlling the fracture strain was found.However, any clear dependency on strain rate was hard to detect.Keywords: Mechanical testing, Failure mechanism, High strain rate,

Keyword [en]
Mechanical testing, Failure mechanism, High strain rate, High temperature, Digital image correlation
National Category
Metallurgy and Metallic Materials
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-62599OAI: oai:DiVA.org:ltu-62599DiVA: diva2:1083699
Available from: 2017-03-22 Created: 2017-03-22 Last updated: 2017-04-05
In thesis
1. Method Development for Characterisation of Superalloy used in Containment Design
Open this publication in new window or tab >>Method Development for Characterisation of Superalloy used in Containment Design
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Metodutveckling för karaktärisering av superlegering med tillämpning i containmentdimensionering
Place, publisher, year, edition, pages
Luleå University of Technology, 2017
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Metallurgy and Metallic Materials Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-62799 (URN)978-91-7583-866-3 (ISBN)978-91-7583-867-0 (ISBN)
Public defence
2017-05-24, A109, LTU, Luleå, 09:00 (English)
Opponent
Supervisors
Funder
VINNOVA
Available from: 2017-04-05 Created: 2017-03-30 Last updated: 2017-04-21Bibliographically approved

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