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Lindström, Thomas
Publications (3 of 3) Show all publications
Lindström, T. (2020). Constitutive modelling of an additively manufactured alloy for fatigue lifing in high temperature applications. (Licentiate dissertation). Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Constitutive modelling of an additively manufactured alloy for fatigue lifing in high temperature applications
2020 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The main objective of the work presented in this Licentiate thesis is to investigate and model the cyclic behaviour of an additively manufactured ductile nickel-based superalloy, with special emphasis on modelling the stabilised material behaviour, which is of interest for fatigue life predictions. Cyclic fatigue tests at different temperatures have been performed to investigate the cyclic mechanical behaviour of the material, where specimens built in different orientations have been used to also study the anisotropic behaviour of the material. Based on the tests, a constitutive description has progressively been developed and implemented in a finite element context that incorporates the anisotropic behaviour under both elastic and inelastic deformations. In addition, the room temperature crack initiation behaviour has been studied and modelled. This thesis is divided into two parts. The first part gives an introduction and background to the research, while the second part consists of three included papers.

Abstract [sv]

Det huvudsakliga målet med arbetet som presenteras i denna avhandling har varit att studera och modellera det cykliska beteendet hos en additivt tillverkad duktil nickelbaserad superlegering, med fokus på att modellera det stabiliserade materialbeteendet, vilket är av intresse vid livslängdprediktering. Cykliska utmattningsprov vid olika temperaturer har utförts för att studera det cykliska beteendet hos materialet, där provstavar byggda i olika riktningar har använts för att studera materialets anisotropi. Baserat på proven har en konstitutiv beskrivning av material progressivt utvecklats och implementerats i ett finita element-verktyg, där modellen tar hänsyn till det anisotropa materialbeteendet för både elastiska och plastiska deformationer. En modell för prediktering av sprickinitiering vid rumstemperatur har också tagits fram. Denna avhandling består av två delar. Den första delen ger en introduktion samt bakgrund till forskningen, medan den andra delen består av tre inkluderade artiklar.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2020. p. 27
Series
Linköping Studies in Science and Technology. Licentiate Thesis, ISSN 0280-7971 ; 1879
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-165383 (URN)10.3384/lic.diva-165383 (DOI)9789179298494 (ISBN)
Presentation
2020-05-19, ACAS, A-Building, Campus Valla, Linköping, 10:15 (Swedish)
Opponent
Supervisors
Funder
Swedish Energy Agency
Note

Ytterligare forskningsfinansiär: Siemens Industrial Turbomachinery AB

Available from: 2020-04-28 Created: 2020-04-28 Last updated: 2020-04-28Bibliographically approved
Calmunger, M., Eriksson, R., Lindström, T. & Leidermark, D. (2019). Effect of Additive Manufacturing on Fatigue Crack Propagation of a Gas Turbine Superalloy. In: Structural Integrity Procedia: . Paper presented at 9th International Conference on Materials Structure and Micromechanics of Fracture, MSMF9, Brno, Czech Republic, June 26-28, 2019.. Elsevier
Open this publication in new window or tab >>Effect of Additive Manufacturing on Fatigue Crack Propagation of a Gas Turbine Superalloy
2019 (English)In: Structural Integrity Procedia, Elsevier, 2019Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Additive manufacturing, fatigue fractography, EBSD
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-161724 (URN)
Conference
9th International Conference on Materials Structure and Micromechanics of Fracture, MSMF9, Brno, Czech Republic, June 26-28, 2019.
Available from: 2019-11-07 Created: 2019-11-07 Last updated: 2019-11-15Bibliographically approved
Wärdig, R., Bachrach-Lindström, M., Foldemo, A., Lindström, T. & Hultsjö, S. (2013). Prerequisites for A Healthy Lifestyle: Experiences of Persons with Psychosis. Issues in Mental Health Nursing, 34(8), 602-610
Open this publication in new window or tab >>Prerequisites for A Healthy Lifestyle: Experiences of Persons with Psychosis
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2013 (English)In: Issues in Mental Health Nursing, ISSN 0161-2840, E-ISSN 1096-4673, Vol. 34, no 8, p. 602-610Article in journal (Refereed) Published
Abstract [en]

The purpose of this study is to explore prerequisites for a healthy lifestyle as described by individuals diagnosed with psychosis. Forty participants who had performed a lifestyle intervention focusing on physical activities and lifestyle education were interviewed. Conventional content analysis was used. The results are described in two categories: (1) Individual Prerequisites and (2) Being a Part of Society. The individuals said that they got stuck in a state of planning without taking action. It was pointless to make a bigger effort because the psychotic disorder could, at any time, worsen the prerequisites. They also said that they wanted to live like everybody else and therefore tried to adopt a normal lifestyle. Future interventions or professional support by mental health nurses and other health care givers should target the transition from planning to action to achieve a healthy lifestyle, and should help the individual to taking part in society.

Place, publisher, year, edition, pages
Taylor & Francis, 2013
National Category
Nursing
Identifiers
urn:nbn:se:liu:diva-162646 (URN)10.3109/01612840.2013.790525 (DOI)000209366600006 ()23909672 (PubMedID)2-s2.0-84881402205 (Scopus ID)
Available from: 2019-12-12 Created: 2019-12-12 Last updated: 2019-12-19Bibliographically approved
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