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Method Development for Characterisation of Superalloy used in Containment Design
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials. (Hållfasthetslära)ORCID iD: 0000-0002-5351-9338
2017 (English)Doctoral thesis, comprehensive summary (Other academic)Alternative title
Metodutveckling för karaktärisering av superlegering med tillämpning i containmentdimensionering (Swedish)
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: urn:nbn:se:ltu:diva-62799ISBN: 978-91-7583-866-3 (print)ISBN: 978-91-7583-867-0 (electronic)OAI: oai:DiVA.org:ltu-62799DiVA: diva2:1085783
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
List of papers
1. Calibration and validation of plastic high strain rate models for alloy 718
Open this publication in new window or tab >>Calibration and validation of plastic high strain rate models for alloy 718
2013 (English)In: Computational Plasticity XII / [ed] E. Oñate; D.R.J. Owen; D. Peric; B. Suárez, Barcelona, 2013, 469-479 p.Conference paper (Refereed)
Abstract [en]

Alloy 718 (Inconel™ 718), composed mainly of nickel, iron and chromium has properties that are of interest in many high temperature applications. One such application is the containment structure in aero engines which prevents fragments from penetrating the structure in case of blade failure. Impact of blade fragments on the containment structure includes both high strain rates and high temperatures and simulation models must therefore have their base in experimental conditions including transient loading and heating. An experimental method has been developed that utilizes induction heating in a high rate tensile test machine. Strain rates up to the order of 1000 s-1 and temperatures up to 650 °C have been included in the test program. Material parameters for the Johnson-Cook and the Zerilli-Armstrong models are evaluated from experimental data using optimisation. These parameters are then used to simulate a specially designed impact experiment and a direct comparison of a calculated and measured quantity can be made in order to validate model and parameters. The result from the validation experiment showed better agreement for the Johnson-Cook model than the Zerilli-Armstrong model

Place, publisher, year, edition, pages
Barcelona: , 2013
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-27449 (URN)0e719951-985e-4bc7-b1c1-6c0f49130f5d (Local ID)9788494153150 (ISBN)0e719951-985e-4bc7-b1c1-6c0f49130f5d (Archive number)0e719951-985e-4bc7-b1c1-6c0f49130f5d (OAI)
Conference
International Conference on Computational Plasticity. Fundamentals and Applications : 03/09/2013 - 05/09/2013
Note
Godkänd; 2013; 20131217 (tedsjo)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-04-05Bibliographically approved
2. Reverse ballistic experiment resembling the conditions in turbine blade off event for containment structures
Open this publication in new window or tab >>Reverse ballistic experiment resembling the conditions in turbine blade off event for containment structures
2016 (English)In: Thin-walled structures, ISSN 0263-8231, E-ISSN 1879-3223, Vol. 107, 671-677 p.Article in journal (Refereed) Published
Abstract [en]

An experimental technique has been developed which allows loading of heated sheet material under impact conditions with simultaneous measurement of the impact force history. The combined characteristics of impact loading at elevated temperature makes the experiment ideal for validation of models used to simulate the containment structure surrounding aircraft engines. In this paper experimental results for Alloy 718 are presented, a nickel based super alloy commonly used in hot parts of the containment structure. The experimental results are then compared to simulations in order to validate previously calibrated material parameters. The basic principle of the validation experiment is based on reverse ballistics, in which a thin circular specimen with free boundaries impacts the end of an instrumented rod. Using induction heating the specimen is heated to temperatures up to 650 °C and a gun driven by compressed air accelerates the specimens to desired velocity. In the reported work velocities are kept low enough to avoid cracking and thus the study is limited to plastic conditions, even though the technique is applicable also for fracture studies. The free boundaries of the experiment makes numerical modelling and simulation straightforward, making it valuable as a validation tool. All numerical simulations are performed using the commercial finite element code LS-Dyna and plastic behaviour of the material was modelled with the Johnson-Cook material model

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-14178 (URN)10.1016/j.tws.2016.07.002 (DOI)000383813200054 ()2-s2.0-84982803960 (ScopusID)d87e4938-9599-407f-9604-78c6dbbcdf41 (Local ID)d87e4938-9599-407f-9604-78c6dbbcdf41 (Archive number)d87e4938-9599-407f-9604-78c6dbbcdf41 (OAI)
Note

Validerad; 2016; Nivå 2; 20160825 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-04-05Bibliographically approved
3. Fracture behaviour of Alloy 718 at high strain rates, elevated temperatures, and various stress triaxialities
Open this publication in new window or tab >>Fracture behaviour of Alloy 718 at high strain rates, elevated temperatures, and various stress triaxialities
(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
Mechanical testing, Failure mechanism, High strain rate, High temperature, Digital image correlation
National Category
Metallurgy and Metallic Materials
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-62599 (URN)
Available from: 2017-03-22 Created: 2017-03-22 Last updated: 2017-04-05
4. Experimental Characterization of Triaxiality Stress State Evolution for Sheet Metal Materials
Open this publication in new window or tab >>Experimental Characterization of Triaxiality Stress State Evolution for Sheet Metal Materials
(English)Manuscript (preprint) (Other academic)
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-62474 (URN)
Available from: 2017-03-13 Created: 2017-03-13 Last updated: 2017-04-05
5. Calibration and Validation of Three Fracture Criteria for Alloy 718 Subjected to High Strain Rates and Elevated Temperatures
Open this publication in new window or tab >>Calibration and Validation of Three Fracture Criteria for Alloy 718 Subjected to High Strain Rates and Elevated Temperatures
(English)Manuscript (preprint) (Other academic)
National Category
Metallurgy and Metallic Materials
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-62596 (URN)
Available from: 2017-03-22 Created: 2017-03-22 Last updated: 2017-04-05

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