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Simonsson, Kjell, Professor
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Publications (10 of 85) Show all publications
Lindström, T., Nilsson, D., Simonsson, K., Eriksson, R., Lundgren, J.-E. & Leidermark, D. (2023). Accounting for anisotropic, anisothermal, and inelastic effects in crack initiation lifing of additively manufactured components. Fatigue & Fracture of Engineering Materials & Structures, 46(2), 396-415
Open this publication in new window or tab >>Accounting for anisotropic, anisothermal, and inelastic effects in crack initiation lifing of additively manufactured components
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2023 (English)In: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 46, no 2, p. 396-415Article in journal (Refereed) Published
Abstract [en]

The crack initiation life of a ductile additively manufactured nickel-based superalloy is studied and modeled for low-cycle fatigue and thermomechanical fatigue conditions up to 600 degrees C. Isothermal experiments were performed on smooth specimens at temperatures up to 600 degrees C with different applied strain ranges. Additionally, thermomechanical fatigue experiments at 100-450 degrees C and 100-600 degrees C were performed on smooth specimens under in-phase and out-of-phase conditions. A life prediction model accounting for the anisotropy was developed, where the temperature cycle is accounted with a Delta T$$ \Delta T $$-functionality, generating good agreements with the experiments. The model was also validated on notched specimens undergoing thermomechanical fatigue conditions at 100-500 degrees C using simplified notch correction methods.

Place, publisher, year, edition, pages
Wiley, 2023
Keywords
anisotropy; fatigue life prediction; low-cycle fatigue; thermomechanical fatigue; cycling
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-190108 (URN)10.1111/ffe.13873 (DOI)000879338900001 ()
Note

Funding Agencies|Linkoping University; Siemens Energy AB

Available from: 2022-11-23 Created: 2022-11-23 Last updated: 2023-11-30Bibliographically approved
Andersson, H., Holmberg, J., Simonsson, K., Hilding, D., Schill, M. & Leidermark, D. (2023). Simulation of wear in hydraulic percussion units using a co-simulation approach. International Journal of Modelling and Simulation, 43(3), 265-281
Open this publication in new window or tab >>Simulation of wear in hydraulic percussion units using a co-simulation approach
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2023 (English)In: International Journal of Modelling and Simulation, ISSN 0228-6203, Vol. 43, no 3, p. 265-281Article in journal (Refereed) Published
Abstract [en]

In this study, a developed co-simulation method, which couples 1D-fluid and 3D-structural models, has been utilised to simulate wear in a hydraulic percussion unit. The effect of wear is generally detrimental on performance and lifetime for such units, but can also cause catastrophic failure and breakdown, requiring a total overhaul and replacement of core components. One experiment of standard straight impact was performed to investigate the tolerance against seizure. The percussion unit was operated at successively increasing operating pressures, and the level of wear was registered at each step, until seizure occurred. The co-simulation model was used to replicate the running conditions from the experiment to simulate the structural response to be used as input for the wear routine to calculate the wear depth. The wear pattern from the simulations corresponds well to the wear pattern from the experiment. Further, the effect of a misaligned impact on wear development was also studied, as this is a loading situation that typically occurs for hydraulic percussion units. The study demonstrates that the simulation method used has a potential for simulating wear and predicting seizure in hydraulic percussion units.

Place, publisher, year, edition, pages
Taylor & Francis, 2023
Keywords
Co-simulation; fluidstructurecoupling; system simulation; FEM; wear; fluid power machinery; seizure
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-184663 (URN)10.1080/02286203.2022.2066349 (DOI)000788982000001 ()
Note

Funding: Epiroc Tools & Attachments Division

Available from: 2022-04-29 Created: 2022-04-29 Last updated: 2023-11-14Bibliographically approved
Loureiro, J., Almroth, P., Palmert, F., Gustafsson, D., Simonsson, K., Eriksson, R. & Leidermark, D. (2021). Accounting for crack closure effects in TMF crack growth tests with extended hold times in gas turbine blade alloys. International Journal of Fatigue, 142
Open this publication in new window or tab >>Accounting for crack closure effects in TMF crack growth tests with extended hold times in gas turbine blade alloys
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2021 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 142Article in journal (Refereed) Published
Abstract [en]

Crack closure effects are known to have a large impact on crack growth behaviour. In this work, tests were performed on Inconel 792 specimens under TMF loading conditions at 100–850 °C with extended hold times at tensile stress. The effective stress-intensity range was estimated experimentally using a compliance-based method leading to the conclusion that crack closure appears to have a primary impact on the crack growth behaviour for this material under the conditions studied. The crack closure behaviour for the tests was successfully modelled using numerical simulations, including creep.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Crack propagation, Inconel 792, Thermomechanical fatigue, Turbine blade, Crack closure, Compliance, Node release
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-170273 (URN)10.1016/j.ijfatigue.2020.105917 (DOI)000591564100006 ()
Funder
Swedish Energy Agency
Note

Ytterligare forskningsfinansiär: Siemens Industrial Turbomachinery AB through “Turbines for Future Energy Systems” (Turbiner för framtidens energisystem), Grant No. 44100-1

Available from: 2020-10-07 Created: 2020-10-07 Last updated: 2022-05-17Bibliographically approved
Pant, P., Proper, S., Luzin, V., Sjöström, S., Simonsson, K., Moverare, J., . . . Peng, R. L. (2020). Mapping of Residual Stresses in As-built Inconel 718 Fabricated by Laser Powder Bed Fusion: A Neutron Diffraction Study of Build Orientation Influence on Residual Stresses. Additive Manufacturing, 36, Article ID 101501.
Open this publication in new window or tab >>Mapping of Residual Stresses in As-built Inconel 718 Fabricated by Laser Powder Bed Fusion: A Neutron Diffraction Study of Build Orientation Influence on Residual Stresses
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2020 (English)In: Additive Manufacturing, ISSN 2214-8604, E-ISSN 2214-7810, Vol. 36, article id 101501Article in journal (Refereed) Published
Abstract [en]

Manufacturing of functional (ready to use) parts with the powder bed fusion method has seen an increase in recent times in the field of aerospace and in the medical sector. Residual stresses (RS) induced due to the process itself can lead to defects like cracks and delamination in the part leading to the inferior quality of the part. These RS are one of the main reasons preventing the process from being adopted widely. The powder bed methods have several processing parameters that can be optimized for improving the quality of the component, among which, build orientation is one. In this current study, influence of the build orientation on the residual stress distribution for the Ni-based super-alloy Inconel 718 fabricated by laser-based powder bed fusion method is studied by non- destructive technique of neutron diffraction at selected cross-sections. Further, RS generated in the entire part was predicted using a simplified layer by layer approach using a finite element (FE) based thermo-mechanical numerical model. From the experiment, the part printed in horizontal orientation has shown the least amount of stress in all three directions and a general tendency of compressive RS at the center of the part and tensile RS near the surface was observed in all the samples. The build with vertical orientation has shown the highest amount of RS in both compression and tension. Simplified simulations results are in good agreement with the experimental value of the stresses.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Additive manufacturing, residual stresses, superalloys, neutron diffraction, FEM
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-171870 (URN)10.1016/j.addma.2020.101501 (DOI)000600807800087 ()2-s2.0-85089410646 (Scopus ID)
Note

Funding agencies: Swedish Foundation for Strategic Research (SSF) within the Swedish national graduate school in neutron scattering (SwedNess); ANSTO; Swedish Governmental Agency of Innovation Systems (Vinnova)Vinnova

Available from: 2020-12-10 Created: 2020-12-10 Last updated: 2022-04-22Bibliographically approved
Azeez, A., Eriksson, R., Calmunger, M., Lindström, S. B. & Simonsson, K. (2019). Low Cycle Fatigue Modelling of Steam Turbine Rotor Steel. In: Jaroslav Pokluda, Pavel Šandera (Ed.), 9th International Conference Materials Structure & Micromechanics of Fracture (MSMF9): . Paper presented at 9th International Conference on Materials Structures and Micromechanics of Fracture, MSMF9, in Brno, Czech Republic, June 26-28, 2019 (pp. 149-154). Elsevier, 23
Open this publication in new window or tab >>Low Cycle Fatigue Modelling of Steam Turbine Rotor Steel
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2019 (English)In: 9th International Conference Materials Structure & Micromechanics of Fracture (MSMF9) / [ed] Jaroslav Pokluda, Pavel Šandera, Elsevier, 2019, Vol. 23, p. 149-154Conference paper, Published paper (Refereed)
Abstract [en]

Materials in steam turbine rotors are subjected to cyclic loads at high temperature, causing cracks to initiate and grow. To allow for more flexible operation, accurate fatigue models for life prediction must not be overly conservative. In this study, fully reversed low cycle fatigue tests were performed on a turbine rotor steel called FB2. The tests were done isothermally, within temperature range of room temperature to 600 °C, under strain control with 0.8-1.2 % total strain range. Some tests included hold time to calibrate the short-time creep behaviour of the material. Different fatigue life models were constructed. The life curve in terms of stress amplitude was found unusable at 600 °C, while the life curve in terms of total strain or inelastic strain amplitudes displayed inconsistent behaviour at 500 °C. To construct better life model, the inelastic strain amplitudes were separated into plastic and creep components by modelling the deformation behaviour of the material, including creep. Based on strain range partitioning approach, the fatigue life depends on different damage mechanisms at different strain ranges. This allowed the formulation of life curves based on plasticity or creep domination, which showed creep domination at 600 °C, while at 500 °C, creep only dominates for higher strain range.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Procedia Structural Integrity, ISSN 2452-3216
Keywords
Low cycle fatigue, Creep-fatigue intraction, Strain range partitioning, FB2, Creep-resistant steel, Rotor steel
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-161736 (URN)10.1016/j.prostr.2020.01.078 (DOI)
Conference
9th International Conference on Materials Structures and Micromechanics of Fracture, MSMF9, in Brno, Czech Republic, June 26-28, 2019
Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2023-01-09Bibliographically approved
Andersson, H., Simonsson, K., Hilding, D., Schill, M. & Leidermark, D. (2017). System level co-simulation of a control valve and hydraulic cylinder circuit in a hydraulic percussion unit. In: Petter Krus, Liselott Ericson and Magnus Sethson (Ed.), Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden: . Paper presented at 15th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden (pp. 225-235). Linköping: Linköping University Electronic Press, 144
Open this publication in new window or tab >>System level co-simulation of a control valve and hydraulic cylinder circuit in a hydraulic percussion unit
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2017 (English)In: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden / [ed] Petter Krus, Liselott Ericson and Magnus Sethson, Linköping: Linköping University Electronic Press, 2017, Vol. 144, p. 225-235Conference paper, Published paper (Refereed)
Abstract [en]

In this study a previously developed co-simulation method that is based on a 1D system model representing the fluid components of a hydraulic machinery, within which structural 3D Finite Element (FE) models can be incorporated for detailed simulation of specific sub-models or complete structural assemblies, is further developed. The fluid system model consists of ordinary differential equation sub-models that are computationally very inexpensive, but still represents the fluid dynamics very well. The co-simulation method has been shown to work very well for a simple model representing a hydraulic driven machinery. A more complex model was set up in this work, in which two cylinders in the hydraulic circuit were evaluated. Such type of models, including both the main piston and control valves, are necessary as they represent the real application to a further extent than the simple model, of only one cylinder. Two models have been developed and evaluated, from the simple rigid body representation of the structural mechanics model, to the more complex model using linear elastic representation. The 3D FE-model facilitates evaluation of displacements, stresses, and strains on a local level of the model. The results can be utilised for fatigue assessment, wear analysis and for predictions of noise radiation.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2017
Series
Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 144
Keywords
Co-simulation, Fluid-structure coupling, System simulation, Functional mockup interface, Fluid power machinery, Transmission line modelling
National Category
Applied Mechanics Vehicle Engineering Control Engineering
Identifiers
urn:nbn:se:liu:diva-151015 (URN)10.3384/ecp17144225 (DOI)9789176853696 (ISBN)
Conference
15th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden
Available from: 2018-09-11 Created: 2018-09-11 Last updated: 2022-02-17Bibliographically approved
Ewest, D., Almroth, P., Sjödin, B., Leidermark, D. & Simonsson, K. (2016). Comparison between linear and non-linear fracture mechanics analysis of experimental data for the ductile superalloy Haynes 230. Journal of engineering for gas turbines and power, 138(6), 062101-1-062101-7
Open this publication in new window or tab >>Comparison between linear and non-linear fracture mechanics analysis of experimental data for the ductile superalloy Haynes 230
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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 6, p. 062101-1-062101-7Article in journal (Refereed) Published
Abstract [en]

With increasing use of renewable energy sources, an industrial gas turbine is often a competitive solution to balance the power grid. However, life robustness approaches for gas turbine components operating under increasingly cyclic conditions are a challenging task. Ductile superalloys, as Haynes 230, are often used in stationary gas turbine hot parts such as combustors. The main load for such components is due to nonhomogeneous thermal expansion within or between parts. As the material is ductile, there is considerable redistribution of stresses and strains due to inelastic deformations during the crack initiation phase. Therefore, the subsequent crack growth occurs through a material with significant residual stresses and strains. In this work, fatigue crack propagation experiments, including the initiation phase, have been performed on a single edge notched specimen under strain controlled conditions. The test results are compared to fracture mechanics analyses using the linear ΔK and the nonlinear ΔJ approaches, and an attempt to quantify the difference in terms of a life prediction is made. For the tested notched geometry, material, and strain ranges, the difference in the results using ΔKeff or ΔJeff is larger than the scatter seen when fitting the model to the experimental data. The largest differences can be found for short crack lengths, when the cyclic plastic work is the largest. The ΔJ approach clearly shows better agreement with the experimental results in this regime.

Place, publisher, year, edition, pages
ASME Press, 2016
National Category
Applied Mechanics Other Materials Engineering
Identifiers
urn:nbn:se:liu:diva-126576 (URN)10.1115/1.4031712 (DOI)000374713500010 ()
Note

Funding agencies: Siemens Industrial Turbomachinery AB, Finspang, Sweden

Available from: 2016-03-30 Created: 2016-03-30 Last updated: 2017-11-30
Kapidzic, Z., Ansell, H., Schön, J. & Simonsson, K. (2016). Fatigue bearing failure of CFRP composite in bolted joints exposed to biaxial variable amplitude loading at elevated temperature. Composite structures, 142, 71-77
Open this publication in new window or tab >>Fatigue bearing failure of CFRP composite in bolted joints exposed to biaxial variable amplitude loading at elevated temperature
2016 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 142, p. 71-77Article in journal (Refereed) Published
Abstract [en]

Hybrid structures than contain composite-aluminium interfaces tend to develop internal loads at elevated temperatures. In long bolted joints, the thermally induced bolt loads are superimposed onto the mechanically applied load and can induce a biaxial bearing load state. This paper presents an experimental and numerical study of the bearing fatigue failure of carbon-epoxy laminate specimens, exposed to uniaxial and biaxial variable amplitude loading at 90C. A specifically designed experimental rig was used, where both the mechanical and the thermally induced bolt loads were applied by means of mechanical load actuators. A fatigue model based on the kinetic theory of fracture for polymers, which was previously implemented for constant amplitude loading, is expanded to account for the variable amplitude load history. The results suggest that the biaxial loading gives a longer fatigue life than the uniaxial loading for the same maximum peak resultant force. This result can be utilized as a conservative dimensioning strategy by designing biaxially loaded joints in terms of maximum peak resultant bearing load using uniaxial fatigue data.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Carbon-epoxy, Thermally induced load, Fatigue bearing failure, Variable amplitude loading
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:liu:diva-122420 (URN)10.1016/j.compstruct.2016.01.064 (DOI)000372691300008 ()
Note

Vid tiden för disputation förelåg publikationen som manuskript

Funding agencies:  Swedish Armed Forces; Swedish Defence Materiel Administration; Swedish Governmental Agency for Innovation Systems

Available from: 2015-11-02 Created: 2015-11-02 Last updated: 2017-12-01Bibliographically approved
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
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