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Sjöström, Karl Henning Sören
Alternative names
Publications (10 of 42) Show all publications
Storgärds, E., Saarimäki, J., Simonsson, K., Sjöström, S., Månsson, T. & Moverare, J. (2016). Influence of Superimposed Vibrational Load on Dwell Time Crack Growth in a Ni-Based Superalloy. International Journal of Fatigue, 87, 301-310
Open this publication in new window or tab >>Influence of Superimposed Vibrational Load on Dwell Time Crack Growth in a Ni-Based Superalloy
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2016 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 87, p. 301-310Article in journal (Refereed) Published
Abstract [en]

Sustained loads have for some Ni-based superalloys been shown to give rise to increased crack growth rate at elevated temperature. Such loads generate a history dependent fatigue problem due to weakening and cracking of grain boundaries during dwell times, later broken apart during subsequent load cycles. So far most studies have focused on the interaction of load cycles, overloads, and temperature. However, vibrations of different kinds are to some extent always present in engine components, and an investigation of how such loads affect the dwell time cracking, and how to incorporate them in a modelling context, is therefore of importance. In this paper a study of the most frequently used gas turbine material, Inconel 718, has been carried out. Mechanical crack propagation testing has been conducted at 550 °C for surface cracks with and without the interaction of superimposed vibrational loads. Subsequent investigation of the fracture behaviour was performed by scanning electron microscopy and the modelling work has been conducted by incorporating the vibration load description within a history dependent crack growth law. The obtained results show reasonable accuracy with respect to the mechanical test results.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Dwell time, vibrational load, crack growth modelling, Inconel 718, high temperature
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-126921 (URN)10.1016/j.ijfatigue.2016.02.018 (DOI)000374615900032 ()
Note

Funding agencies:  Swedish Energy Agency; Siemens Industrial Turbomachinery AB; GKN Aerospace Engine Systems; Royal Institute of Technology through the Swedish research programme TURBO POWER

Available from: 2016-04-07 Created: 2016-04-07 Last updated: 2017-11-30
Storgärds, E., Simonsson, K., Sjöström, S., Gustafsson, D. & Månsson, T. (2016). Modeling of Crack Growth With Dwell Time for Aero-engine Spectra Loadings in a Ni-Based Superalloy. Journal of engineering for gas turbines and power, 138(1), 012501-012501
Open this publication in new window or tab >>Modeling of Crack Growth With Dwell Time for Aero-engine Spectra Loadings in a Ni-Based Superalloy
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2016 (English)In: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 138, no 1, p. 012501-012501Article in journal (Refereed) Published
Abstract [en]

Testing and simulation of aero-engine spectra with dwell times are reported in this paper. The modeling concept used is built on linear elastic fracture mechanics (LEFM) and provides a history-dependent evolution description of dwell damage and its interaction with cyclic load. The simulations have been carried out for three spectra: (1) cyclic loads, (2) combined sustained load and cyclic loads, and (3) slow load ramps and cyclic loads, all for surface cracks at 550 °C for Inconel 718. All simulations show reasonable good agreement with experimental results. Prediction of multiple tests of several batches is also provided to show statistical scatter.

Place, publisher, year, edition, pages
ASME Press, 2016
National Category
Applied Mechanics Mechanical Engineering Materials Engineering
Identifiers
urn:nbn:se:liu:diva-121005 (URN)10.1115/1.4031155 (DOI)000371127900012 ()
Note

Funding agencies: Swedish Energy Agency; Siemens Industrial Turbomachinery AB; GKN Aerospace Engine Systems; Royal Institute of Technology through Swedish Research Programme TURBO POWER

Available from: 2015-09-02 Created: 2015-09-02 Last updated: 2017-12-04Bibliographically approved
Storgärds, E., Saarimäki, J., Simonsson, K., Sjöström, S., Gustafsson, D., Månsson, T. & Moverare, J. (2016). Scatter in Dwell Time Cracking for a Ni-Based Superalloy in Combination With Overloads. Journal of engineering for gas turbines and power, 138(1), 012502-012502
Open this publication in new window or tab >>Scatter in Dwell Time Cracking for a Ni-Based Superalloy in Combination With Overloads
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2016 (English)In: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 138, no 1, p. 012502-012502Article in journal (Refereed) Published
Abstract [en]

In this paper, scatter in crack growth for dwell time loadings in combination with overloads has been investigated. Multiple tests were performed for surface cracks at 550 °C in the commonly used high temperature material Inconel 718. The test specimens originate from two different batches which also provide for a discussion of how material properties affect the dwell time damage and overload impact. In combination with these tests, an investigation of the microstructure was also carried out, which shows how it influences the growth rate. The results from this study show that, in order to take overloads into consideration when analyzing spectrum loadings containing dwell times, one needs a substantial amount of material data available as the scatter seen from one batch to the other are of significant proportions.

Place, publisher, year, edition, pages
ASME Press, 2016
National Category
Mechanical Engineering Materials Engineering Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-121007 (URN)10.1115/1.4031157 (DOI)000371127900013 ()
Note

Funding agencies: Swedish Energy Agency; Siemens Industrial Turbomachinery AB; GKN Aerospace Engine Systems; Royal Institute of Technology through Swedish research programme TURBO POWER

Available from: 2015-09-02 Created: 2015-09-02 Last updated: 2017-12-04Bibliographically approved
Storgärds, E., Simonsson, K., Sjöström, S. & Moverare, J. (2016). Thermomechanical Fatigue Crack Growth Modeling in a Ni-Based Superalloy Subjected to Sustained Load. Journal of engineering for gas turbines and power, 138(1), 012503-012503
Open this publication in new window or tab >>Thermomechanical Fatigue Crack Growth Modeling in a Ni-Based Superalloy Subjected to Sustained Load
2016 (English)In: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 138, no 1, p. 012503-012503Article in journal (Refereed) Published
Abstract [en]

Thermomechanical fatigue (TMF) crack growth modeling has been conducted on Inconel 718 with dwell time at maximum load. A history dependent damage model taking dwell damage into account, developed under isothermal conditions, has been extended for TMF conditions. Parameter determination for the model is carried out on isothermal load controlled tests at 550–650 °C for surface cracks, which later have been used to extrapolate parameters used for TMF crack growth. Further, validation of the developed model is conducted on a notched specimen subjected to strain control at 50–550 °C. Satisfying results are gained within reasonable scatter level compared for test and simulated number of cycles to failure.

Place, publisher, year, edition, pages
ASME Press, 2016
National Category
Mechanical Engineering Materials Engineering Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-121008 (URN)10.1115/1.4031158 (DOI)000371127900014 ()
Note

Funding agencies: Swedish Energy Agency; Siemens Industrial Turbomachinery AB; GKN Aerospace Engine Systems; Royal Institute of Technology through Swedish research programme TURBO POWER

Available from: 2015-09-02 Created: 2015-09-02 Last updated: 2017-12-04Bibliographically approved
Storgärds, E., Simonsson, K. & Sjöström, S. (2016). Three-dimensional crack growth modelling of a Ni-based superalloy at elevated temperature and sustained loading. Theoretical and applied fracture mechanics (Print)
Open this publication in new window or tab >>Three-dimensional crack growth modelling of a Ni-based superalloy at elevated temperature and sustained loading
2016 (English)In: Theoretical and applied fracture mechanics (Print), ISSN 0167-8442, E-ISSN 1872-7638Article in journal (Refereed) Published
Abstract [en]

High temperature materials subjected to elevated temperature have been shown to be sensitive to dwell times, giving an increased crack growth rate. The interaction between these dwell times and rapid cyclic loads have been shown to constitute a complex problem. Many models have been developed for 1D conditions, but the application to general 3D conditions has seldom been seen, although this is the most common case in most structures. In this paper a model for taking care of the interaction between these load modes in general 3D crack growth has been developed. The model uses 1D results for extension to general 3D, thus providing for local crack front evolution with a minimum of numerical simulations. The model has been implemented for usage with finite element calculations and several different tests are simulated and compared with experimental results for the nickel based superalloy Inconel 718 at 550◦C. The simulation results show crack shapes in agreement with experimental fracture surfaces and time to failure.

Keywords
Sustained load, Crack growth modelling, Crack tunnelling, Ni-based superalloy, High temperature
National Category
Applied Mechanics Materials Engineering
Identifiers
urn:nbn:se:liu:diva-121004 (URN)10.1016/j.tafmec.2015.11.008 (DOI)000369204600002 ()
Note

Funding agencies:  Swedish Energy Agency; Siemens Industrial Turbomachinery AB; GKN Aerospace Engine Systems; Royal Institute of Technology through the Swedish research programme TURBO POWER

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Available from: 2015-09-02 Created: 2015-09-02 Last updated: 2017-12-04Bibliographically approved
Storgärds, E., Saarimäki, J., Simonsson, K., Sjöström, S., Månsson, T. & Moverare, J. (2015). Impact of high cycle fatigue on dwell time crack growth in a Ni-based superalloy.
Open this publication in new window or tab >>Impact of high cycle fatigue on dwell time crack growth in a Ni-based superalloy
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2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Sustained load have been shown to give rise to increased crack growth rate at elevated temperature. Such loads generate a history dependent fatigue problem due to weakening and cracking of grain boundaries during dwell times, later broken apart during subsequent load cycles. So far most studies have focused on sustained load and the interaction of load cycles, overloads, and temperature, but few studies have been carried out for vibrations and how these affect the dwell time crack growth. Vibrations of different kinds are frequently seen in engine components, and present in combination with sustained loads a more realistic loading situation than the latter itself. An investigation of how a vibrational load affects the dwell time cracking and how to incorporate it in a modelling context is therefore of importance. In this paper a study of the most frequently used gas turbine material, Inconel 718, has been carried out. Mechanical testing has been conducted at 550◦C for surface cracks with and without the interaction of engine vibrations on sustained load, here represented by a superimposed high cycle fatigue (HCF) load. Subsequent investigation of the fracture behaviour was performed by Scanning Electron Microscope (SEM) and the modelling work has been conducted by incorporating the HCF load description within a history dependent crack growth law. The obtained results show reasonable accuracy with respect to the mechanical tests.

Keywords
Hold time effects, Dwell times, Sustained load, Crack growth modelling, Inconel 718, High temperature
National Category
Mechanical Engineering Materials Engineering Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-121009 (URN)
Available from: 2015-09-02 Created: 2015-09-02 Last updated: 2015-09-02Bibliographically approved
Storgärds, E., Simonsson, K., Sjöström, S., Gustafsson, D. & Mansson, T. (2015). MODELLING OF CRACK GROWTH WITH DWELL TIME FOR AERO ENGINE SPECTRA LOADINGS IN A NI-BASED SUPERALLOY. In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2015, VOL 7A: . Paper presented at ASME Turbo Expo: Turbine Technical Conference and Exposition. ASME Press (V07AT28A003)
Open this publication in new window or tab >>MODELLING OF CRACK GROWTH WITH DWELL TIME FOR AERO ENGINE SPECTRA LOADINGS IN A NI-BASED SUPERALLOY
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2015 (English)In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2015, VOL 7A, ASME Press, 2015, no V07AT28A003Conference paper, Published paper (Refereed)
Abstract [en]

Testing and simulation of aero engine spectra with dwell Imes are reported in this paper. The modelling concept used built on LEFM and provides a history dependent evolution 2scription of dwell damage and its interaction with cyclic load. he simulations have been carried out for three spectra, 1) cyclic ?ads, 2) combined sustained load and cyclic loads and 3) slow ad ramps and cyclic loads, all for surface cracks at 550 C for nconel 718. All simulations show reasonable good agreement ith experimental results. Prediction of multiple tests of several atches is also provided to show statistical scatter

Place, publisher, year, edition, pages
ASME Press, 2015
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-129515 (URN)10.1115/GT2015-42701 (DOI)000375810700013 ()978-0-7918-5676-5 (ISBN)
Conference
ASME Turbo Expo: Turbine Technical Conference and Exposition
Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2016-06-20
Storgärds, E., Saarimäki, J., Simonsson, K., Sjöström, S., Gustafsson, D., Mansson, T. & Moverare, J. (2015). SCATTER IN DWELL TIME CRACKING FOR A NI-BASED SUPERALLOY IN COMBINATION WITH OVERLOADS. In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2015, VOL 7A: . Paper presented at ASME Turbo Expo: Turbine Technical Conference and Exposition. ASME Press (V07AT28A004)
Open this publication in new window or tab >>SCATTER IN DWELL TIME CRACKING FOR A NI-BASED SUPERALLOY IN COMBINATION WITH OVERLOADS
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2015 (English)In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2015, VOL 7A, ASME Press, 2015, no V07AT28A004Conference paper, Published paper (Refereed)
Abstract [en]

In this paper scatter in crack growth for dwell time loadings combination with overloads has been investigated. Multiple Jsts were performed for surface cracks at 5500C in the commonly sed high temperature material Inconel 718. The test specimens -iginate from two different batches which also provides for a disission of how material properties affect the dwell time damage rnd overload impact. In combination with these tests an investiation of the microstructure was also carried out, which shows 9w it influences the growth rate. The results from this study show tat, in order to take overloads into consideration when analysing,ectrum loadings containing dwell times, one needs a substantial mount of material data available as the scatter seen from one atch to the other is of significant proportions.

Place, publisher, year, edition, pages
ASME Press, 2015
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:liu:diva-129516 (URN)10.1115/GT2015-42709 (DOI)000375810700014 ()978-0-7918-5676-5 (ISBN)
Conference
ASME Turbo Expo: Turbine Technical Conference and Exposition
Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2016-06-20
Storgärds, E., Simonsson, K., Sjöström, S. & Moverare, J. (2015). THERMO-MECHANICAL FATIGUE CRACK GROWTH MODELLING IN A NI-BASED SUPERALLOY SUBJECTED TO SUSTAINED LOAD. In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2015, VOL 7A: . Paper presented at ASME Turbo Expo: Turbine Technical Conference and Exposition. ASME Press (V07AT28A006)
Open this publication in new window or tab >>THERMO-MECHANICAL FATIGUE CRACK GROWTH MODELLING IN A NI-BASED SUPERALLOY SUBJECTED TO SUSTAINED LOAD
2015 (English)In: PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2015, VOL 7A, ASME Press, 2015, no V07AT28A006Conference paper, Published paper (Refereed)
Abstract [en]

Thermo-mechanical fatigue (TMF) crack growth modelling as been conducted on Inconel 718 with dwell time at maximum;ad. A history dependent damage model taking dwell damage uto account, developed under isothermal conditions, has been xtended for TMF conditions. Parameter determination for the lodel is carried out on isothermal load controlled tests at 55050 C for surface cracks, which later have been used to extrapole parameters used for TMF crack growth. Further, validation the developed model is conducted on a notched specimen sub?cted to strain control at 50-550 C. Satisfying results are gained ithin reasonable scatter level compared for test and simulated umber of cycles to failure.

Place, publisher, year, edition, pages
ASME Press, 2015
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-129514 (URN)10.1115/GT2015-42820 (DOI)000375810700016 ()978-0-7918-5676-5 (ISBN)
Conference
ASME Turbo Expo: Turbine Technical Conference and Exposition
Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2016-06-20
Eriksson, R., Sjöström, S., Brodin, H., Johansson, S., Östergren, L. & Li, X.-H. (2013). Influence of Interface Roughness on the Fatigue Life of Thermal Barrier Coatings. In: : . Paper presented at 13th International Conference on Fracture, June 16-21, 2013, Beijing, China (pp. 1-10).
Open this publication in new window or tab >>Influence of Interface Roughness on the Fatigue Life of Thermal Barrier Coatings
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2013 (English)Conference paper, Published paper (Refereed)
Keywords
thermal barrier coating, interface, roughness, fatigue
National Category
Engineering and Technology Materials Engineering
Identifiers
urn:nbn:se:liu:diva-95555 (URN)
Conference
13th International Conference on Fracture, June 16-21, 2013, Beijing, China
Available from: 2013-07-08 Created: 2013-07-08 Last updated: 2013-07-08
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