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Leidermark, D. & Andersson, M. (Eds.). (2024). Reports in Applied Mechanics 2022. Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Reports in Applied Mechanics 2022
2024 (English)Collection (editor) (Other academic)
Abstract [en]

This is the first volume of the concurring series of Reports in Applied Mechanics, which is based on the outcome of the advanced project course TMPM07 in Applied Mechanics at Link¨oping University during the autumn of 2022. The course lay-up is based on several industrial related projects within the field of Solid Mechanics, concerning fatigue, topology optimisation, structural dimensioning, contacts etc, and Fluid Mechanics, concerning fluid dynamics, flow, aerodynamics, heat transfer etc. The students tackle industry relevant projects in close collaboration with industry from near and neighbouring regions and work in project groups to solve the given tasks within the time limit of the course. Close collaboration with the industry is necessary to define planning, update and feedback for further evaluation at the industry.

Three projects were performed during the course of 2022, two within Solid Mechanics and one in Fluid Mechanics. The projects were all performed in tight collaboration with industry partners, and had a close application to real industrial problems. A good opportunity for the students to show-off all their gained knowledge and apply in the best possible way to make innovative solutions in the respective projects. Something they all managed to do with success!

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2024. p. 30
Series
RAM ; 1
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-200855 (URN)10.3384/9789180754156 (DOI)978-91-8075-415-6 (ISBN)
Note

Collection of student reports.

Available from: 2024-02-12 Created: 2024-02-12 Last updated: 2024-02-12Bibliographically approved
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
Azeez, A., Leidermark, D., Segersäll, M. & Eriksson, R. (2023). Numerical prediction of warm pre-stressing effects for a steam turbine steel. Theoretical and applied fracture mechanics (Print), 125, Article ID 103940.
Open this publication in new window or tab >>Numerical prediction of warm pre-stressing effects for a steam turbine steel
2023 (English)In: Theoretical and applied fracture mechanics (Print), ISSN 0167-8442, E-ISSN 1872-7638, Vol. 125, article id 103940Article in journal (Refereed) Published
Abstract [en]

In warm pre-stressing (WPS), the fracture resistance of cracked steel components is raised when subjected to certain temperature-load histories. WPS’s beneficial effects enhance safety margins and potentially prolong fatigue life. However, understanding and predicting the WPS effects is crucial for employing such benefits. This study utilised pre-cracked compact tension specimens made from steam turbine steel for WPS and baseline fracture toughness testing. Two typical WPS cycles were investigated (L-C-F and L-U-C-F), and an increase in fracture resistance was observed for both cycles. The WPS tests were simulated using finite element analysis to understand its effects and predict the increase in fracture resistance. A local approach was followed based on accumulative plastic strain magnitude ahead of the crack tip. Since cleavage fracture is triggered by active plasticity, the WPS fracture is assumed when accumulated plasticity exceeds the residual plastic zone formed at the crack tip due to the initial pre-load.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Finite element analysis; Fracture mechanics; Fracture toughness; High temperature steel; Warm pre-stressing
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-194734 (URN)10.1016/j.tafmec.2023.103940 (DOI)001012091400001 ()2-s2.0-85160508688 (Scopus ID)
Available from: 2023-06-09 Created: 2023-06-09 Last updated: 2023-10-26Bibliographically 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
Azeez, A., Leidermark, D. & Eriksson, R. (2023). Stress intensity factor solution for single-edge cracked tension specimen considering grips bending effects. Procedia Structural Integrity, 47, 195-204
Open this publication in new window or tab >>Stress intensity factor solution for single-edge cracked tension specimen considering grips bending effects
2023 (English)In: Procedia Structural Integrity, ISSN 2452-3216, Vol. 47, p. 195-204Article in journal (Refereed) Published
Abstract [en]

Using the stress intensity factor to describe the stress field around a crack has become widely adopted due to its simplicity. The stress intensity factor depends on the applied nominal stress, the crack length, and a geometrical factor. Geometrical factors can be obtained from handbook solutions or, for complicated cases, through finite element simulations. Carefully defining the geometrical factor with realistic boundary conditions is vital to obtain accurate values for the stress intensity factor. For fatigue life predictions, even a small error in the stress intensity factor may get amplified as the total fatigue life is computed through integration over thousands of crack growth increments. A commonly used specimen geometry for fatigue crack growth testing is the single-edge cracked specimen. For such a specimen, the crack on one side of the geometry introduces bending, which, to some degree, is constrained by the grips that hold the specimen in the testing rig. The effect of bending on the geometrical factor, and consequently on the stress intensity factor, is generally overlooked due to the assumption that the test rig grips are infinitely stiff. Not considering the bending effects could lead to an inaccurate evaluation of the stress intensity factor, especially for long crack lengths. This work investigated the effect of bending on the stress intensity factor for a single-edge cracked specimen. Different grip dimensions were studied to understand the degree of bending and its impact on the stress intensity factor. The work resulted in recommendations for accurately evaluating the stress intensity factor for single-edge cracked specimens.

Keywords
Fracture mechanics, Stress intensity factor, Finite element, Single-edge cracked specimen
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-198204 (URN)10.1016/j.prostr.2023.07.012 (DOI)
Available from: 2023-09-29 Created: 2023-09-29 Last updated: 2023-10-05
Azeez, A., Eriksson, R., Norman, V., Leidermark, D. & Moverare, J. (2022). The effect of dwell times and minimum temperature on out-of-phase thermomechanical fatigue crack propagation in a steam turbine steel - Crack closure prediction. International Journal of Fatigue, 162, Article ID 106971.
Open this publication in new window or tab >>The effect of dwell times and minimum temperature on out-of-phase thermomechanical fatigue crack propagation in a steam turbine steel - Crack closure prediction
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2022 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 162, article id 106971Article in journal (Refereed) Published
Abstract [en]

Exploring crack growth behaviour is needed to establish accurate fatigue life predictions. Cracked specimens were tested under strain-controlled out-of-phase thermomechanical fatigue conditions. The tests included dwell times and three different minimum temperatures. Higher minimum temperature gave faster crack growth rates while the additions of dwell times showed no effects. Crack closure was observed in all the tests where the addition of dwell times and change in minimum temperature displayed little to no effect on crack closure stresses. Finite element models with a sharp stationary crack and material parameters switching provided acceptable predictions for the maximum, minimum, and crack closure stresses.

Place, publisher, year, edition, pages
Elsevier Science Ltd, 2022
Keywords
Thermomechanical fatigue; Fatigue crack growth; High temperature steel; Crack closure; Numerical modelling
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-187284 (URN)10.1016/j.ijfatigue.2022.106971 (DOI)000829870800006 ()
Note

Funding Agencies: SIEMENS AG

Available from: 2022-08-17 Created: 2022-08-17 Last updated: 2023-09-29
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
Azeez, A., Norman, V., Eriksson, R., Leidermark, D. & Moverare, J. (2021). Out-of-phase thermomechanical fatigue crack propagation in a steam turbine steel — modelling of crack closure. International Journal of Fatigue, 149, Article ID 106251.
Open this publication in new window or tab >>Out-of-phase thermomechanical fatigue crack propagation in a steam turbine steel — modelling of crack closure
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2021 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 149, article id 106251Article in journal (Refereed) Published
Abstract [en]

Understanding of crack growth behaviour is necessary to predict accurate fatigue lives. Out-of-phase thermomechanical fatigue crack propagation tests were performed on FB2 steel used in high-temperature steam turbine sections. Testing results showed crack closure where the compressive part of the fatigue cycle affected crack growth rate. Crack closing stress was observed to be different, and had more influence on the growth rate, than crack opening stress. Crack growth rate was largely controlled by the minimum temperature of the cycle, which agreed with an isothermal crack propagation test. Finite element models with stationary sharp cracks captured the crack closure behaviour.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Thermomechanical fatigue, Fatigue crack growth, High temperature steel, Crack closure, Numerical modelling
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-174692 (URN)10.1016/j.ijfatigue.2021.106251 (DOI)000655657600001 ()
Note

Funding: European UnionEuropean Commission [764545]; Siemens AG

Available from: 2021-03-30 Created: 2021-03-30 Last updated: 2023-09-29
Norman, V., Stekovic, S., Leidermark, D., Engel, B., Rouse, J., Chris, H. & Grant, B. (2020). Crack initiation in notched coarse- grained RR1000 specimens subjected to in-phase thermo-mechanical fatigue. In: Hellmuth Klingelhöffer (Ed.), 4th workshop on thermo-mechanical fatigue: . Paper presented at TMF Workshop 2019, Berlin, Germany, 13-15 November 2019. Berlin
Open this publication in new window or tab >>Crack initiation in notched coarse- grained RR1000 specimens subjected to in-phase thermo-mechanical fatigue
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2020 (English)In: 4th workshop on thermo-mechanical fatigue / [ed] Hellmuth Klingelhöffer, Berlin, 2020Conference paper, Oral presentation only (Other academic)
Place, publisher, year, edition, pages
Berlin: , 2020
Keywords
crack initiation, phase angle, notch specimens, thermo-mechanical fatigue
National Category
Mechanical Engineering Other Materials Engineering
Identifiers
urn:nbn:se:liu:diva-174941 (URN)
Conference
TMF Workshop 2019, Berlin, Germany, 13-15 November 2019
Projects
DevTMF
Funder
EU, Horizon 2020, 686600
Available from: 2021-04-12 Created: 2021-04-12 Last updated: 2022-07-07Bibliographically approved
Lindström, T., Calmunger, M., Eriksson, R. & Leidermark, D. (2020). Fatigue Behaviour of an Additively Manufactured Ductile Gas Turbine Superalloy. Theoretical and applied fracture mechanics (Print) (108), Article ID 102604.
Open this publication in new window or tab >>Fatigue Behaviour of an Additively Manufactured Ductile Gas Turbine Superalloy
2020 (English)In: Theoretical and applied fracture mechanics (Print), ISSN 0167-8442, E-ISSN 1872-7638, no 108, article id 102604Article in journal (Refereed) Published
Abstract [en]

Additive manufacturing (AM) offers new possibilities in gas turbine technology by allowing for more complex geometries. However, the fatigue performance, including crack initiation and crack propagation of AM gas turbine material, is not fully known. In addition, AM materials shows anisotropic properties due to the columnar grain growth in the building direction during the AM process, which needs to be accounted for. Also, an AM component often solidifies with a cellular dendritic structure during the manufacturing process. In the present study, the bulk material of an AM adopted nickel-based superalloy based on Hastelloy X was subjected to low-cycle fatigue (LCF) loading at room temperature. The LCF tests were conducted in strain control on additively manufactured smooth bars,with two different build orientations (with an angle of 0° and 90° relative to the building platform). The LCF results showed that the major part of the fatigue life is spent in the crack initiation phase, namely 78% to 99% of the total fatigue life. Based on the experiments, a model to predict the crack initiation life was developed that takes the anisotropic material behaviour into account. The last part of the fatigue life, the crack propagation phase, was studied on a microstructural level, where initial fractography of the ruptured LCF specimens revealed that the dendritic structure was visible on the fracture surface. It was noted that the dendritic structure could easily be mistaken for regular striations although they represent a different fracture mechanism. The fracture surfaces were therefore cross sectioned and possible correlations between fracture surface characteristics and underlying microstructure were studied using electron backscatter diffraction and electron channelling contrast imaging. The outcome showed that the dendritic structure had some effect on the LCF crack propagation behaviour by interdendritic tearing, which was discussed.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Additive manufacturing, fatigue, fractography, EBSD, crack initiation model
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-166081 (URN)10.1016/j.tafmec.2020.102604 (DOI)000552039000037 ()
Note

Funding agencies:  Swedish Energy AgencySwedish Energy Agency; Siemens Industrial Turbomachinery AB through "Turbines for Future Energy Systems" [44112-1]

Available from: 2020-06-08 Created: 2020-06-08 Last updated: 2022-09-09Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5300-1512

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