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Publications (10 of 24) Show all publications
Olaogun, O., Edberg, J., Lindgren, L.-E., Oluwole, O. O. & Akinlabi, E. (2019). Heat transfer in cold rolling process of AA8015 alloy: a case study of 2-D FE simulation of coupled thermo-mechanical modeling. The International Journal of Advanced Manufacturing Technology, 100(9-12), 2617-2627
Open this publication in new window or tab >>Heat transfer in cold rolling process of AA8015 alloy: a case study of 2-D FE simulation of coupled thermo-mechanical modeling
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2019 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 100, no 9-12, p. 2617-2627Article in journal (Refereed) Published
Abstract [en]

The finite element method (FEM) is one of the most applicable mathematical analytic methods of rolling processes and is also an efficient method for analyzing coupled heat transfer. Thermal analysis of cold rolling process is not frequently used due to the widespread assumption of insignificant impact during rolling process. This research focuses on the development of coupled thermo-mechanical 2-D FE model analysis approach to study the thermal influence and varying coefficient of friction during the industrial cold rolling process of AA8015 aluminum alloy. Both deformable-rigid and deformable-deformable rigid contact algorithms were examined in the 2-D FE model. Findings revealed that temperature distribution in the roll bite rises steadily in a stepwise manner. The deformable-deformable contact algorithm is the best investigations of thermal behavior of the rolled metal and work rolls necessary for typical application in work roll design. The predicted roll separating force is validated with industrial measurements.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
2-D FE model, Contact algorithm, Coupled thermo-mechanical, Heat transfer
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-71692 (URN)10.1007/s00170-018-2811-2 (DOI)000458310400033 ()2-s2.0-85055479036 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-03-08 (johcin)

Available from: 2018-11-21 Created: 2018-11-21 Last updated: 2019-03-08Bibliographically approved
Draxler, J., Edberg, J., Andersson, J. & Lindgren, L.-E. (2019). Modeling and simulation of weld solidification cracking part I: A pore-based crack criterion. Welding in the World, 63(5), 1489-1502
Open this publication in new window or tab >>Modeling and simulation of weld solidification cracking part I: A pore-based crack criterion
2019 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 63, no 5, p. 1489-1502Article in journal (Refereed) Published
Abstract [en]

Several advanced alloy systems are susceptible to weld solidification cracking. One example is nickel-based superalloys, which are commonly used in critical applications such as aerospace engines and nuclear power plants. Weld solidification cracking is often expensive to repair and, if not repaired, can lead to catastrophic failure. This study, presented in three papers, presents an approach for simulating weld solidification cracking applicable to large-scale components. The results from finite element simulation of welding are post-processed and combined with models of metallurgy, as well as the behavior of the liquid film between the grain boundaries, in order to estimate the risk of crack initiation. The first paper in this study describes the crack criterion for crack initiation in a grain boundary liquid film. The second paper describes the model for computing the pressure and the thickness of the grain boundary liquid film, which are required to evaluate the crack criterion in paper 1. The third and final paper describes the application of the model to Varestraint tests of alloy 718. The derived model can fairly well predict crack locations, crack orientations, and crack widths for the Varestraint tests. The importance of liquid permeability and strain localization for the predicted crack susceptibility in Varestraint tests is shown.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Solidification cracking, Hot cracking, Varestraint testing, Computational welding mechanics, Alloy 718
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-75660 (URN)10.1007/s40194-019-00760-x (DOI)000482459300029 ()2-s2.0-85068801005 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-08-22 (johcin)

Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-10-17Bibliographically approved
Draxler, J., Edberg, J., Andersson, J. & Lindgren, L.-E. (2019). Modeling and simulation of weld solidification cracking part II: A model for estimation of grain boundary liquid pressure in a columnar dendritic microstructure. Welding in the World, 63(5), 1503-1519
Open this publication in new window or tab >>Modeling and simulation of weld solidification cracking part II: A model for estimation of grain boundary liquid pressure in a columnar dendritic microstructure
2019 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 63, no 5, p. 1503-1519Article in journal (Refereed) Published
Abstract [en]

Several advanced alloy systems are susceptible to weld solidification cracking. One example is nickel-based superalloys, which are commonly used in critical applications such as aerospace engines and nuclear power plants. Weld solidification cracking is often expensive to repair, and if not repaired, can lead to catastrophic failure. This study, presented in three papers, presents an approach for simulating weld solidification cracking applicable to large-scale components. The results from finite element simulation of welding are post-processed and combined with models of metallurgy, as well as the behavior of the liquid film between the grain boundaries, in order to estimate the risk of crack initiation. The first paper in this study describes the crack criterion for crack initiation in a grain boundary liquid film. The second paper describes the model for computing the pressure and the thickness of the grain boundary liquid film, which are required to evaluate the crack criterion in paper 1. The third and final paper describes the application of the model to Varestraint tests of Alloy 718. The derived model can fairly well predict crack locations, crack orientations, and crack widths for the Varestraint tests. The importance of liquid permeability and strain localization for the predicted crack susceptibility in Varestraint tests is shown.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Solidification cracking, Hot cracking, Varestraint testing, Computational welding mechanics, Alloy 718
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-75653 (URN)10.1007/s40194-019-00761-w (DOI)000482459300030 ()2-s2.0-85068150806 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-08-22 (johcin)

Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-10-17Bibliographically approved
Draxler, J., Edberg, J., Andersson, J. & Lindgren, L.-E. (2019). Modeling and simulation of weld solidification cracking part III: Simulation of solidification cracking in Varestraint tests of alloy 718. Welding in the World, 63(6), 1883-1901
Open this publication in new window or tab >>Modeling and simulation of weld solidification cracking part III: Simulation of solidification cracking in Varestraint tests of alloy 718
2019 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 63, no 6, p. 1883-1901Article in journal (Refereed) Published
Abstract [en]

Several advanced alloy systems are susceptible to weld solidification cracking. One example is nickel-based superalloys, which are commonly used in critical applications such as aerospace engines and nuclear power plants. Weld solidification cracking is often expensive to repair, and if not repaired, can lead to catastrophic failure. This study, presented in three papers, presents an approach for simulating weld solidification cracking applicable to large-scale components. The results from finite element simulation of welding are post-processed and combined with models of metallurgy, as well as the behavior of the liquid film between the grain boundaries, in order to estimate the risk of crack initiation. The first paper in this study describes the crack criterion for crack initiation in a grain boundary liquid film. The second paper describes the model required to compute the pressure and thickness of the liquid film required in the crack criterion. The third and final paper describes the application of the model to Varestraint tests of alloy 718. The derived model can fairly well predict crack locations, crack orientations, and crack widths for the Varestraint tests. The importance of liquid permeability and strain localization for the predicted crack susceptibility in Varestraint tests is shown.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Solidification cracking, Hot cracking, Varestraint testing, Computational welding mechanics, Alloy 718
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-76421 (URN)10.1007/s40194-019-00784-3 (DOI)000501904600030 ()
Note

Validerad;2019;Nivå 2;2019-12-06 (johcin)

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2020-02-25Bibliographically approved
Lindgren, L.-E., Edberg, J., Åkerström, P. & Zhang, Z. (2019). Modeling of thermal stresses in low alloy steels. Paper presented at The 12th International Congress on Thermal Stresses June 1–5, 2019, Zhejiang University, Hangzhou, China. Journal of thermal stresses, 42(6), 725-743
Open this publication in new window or tab >>Modeling of thermal stresses in low alloy steels
2019 (English)In: Journal of thermal stresses, ISSN 0149-5739, E-ISSN 1521-074X, Vol. 42, no 6, p. 725-743Article in journal (Refereed) Published
Abstract [en]

Computing the evolution of thermal stresses accurately requires appropriate constitutive relations. This includes both the thermal and mechanical aspects, as temperature is the driver to thermal stresses. The paradigm of Integrated Computational Materials Engineering (ICME) aims at being able to quantitatively relate process-structure-property of a material. The article describes physics based models, denoted bridging elements, which are one step towards the vision of ICME. They couple material structure with heat capacity, heat conductivity, thermal and transformation strains and elastic properties for hypo-eutectoid steels. The models can account for the chemical composition of the steel and its processing, i.e. thermomechanical history, giving the evolution of the microstructure and the corresponding properties.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Elastic properties, heat capacity, heat conductivity, thermal expansion, thermal stresses
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-73488 (URN)10.1080/01495739.2019.1587329 (DOI)000468282400003 ()2-s2.0-85063905757 (Scopus ID)
Conference
The 12th International Congress on Thermal Stresses June 1–5, 2019, Zhejiang University, Hangzhou, China
Note

Konferensartikel i tidskrift

Available from: 2019-04-08 Created: 2019-04-08 Last updated: 2019-09-13Bibliographically approved
Draxler, J., Edberg, J., Andersson, J. & Lindgren, L.-E. (2019). Simulation of weld solidifiation cracking in varestraint tests of alloy 718. In: C. Sommitsch (Ed.), : . Paper presented at Mathematical Modelling of Weld Phenomena (pp. 485-504). Gratz, 12
Open this publication in new window or tab >>Simulation of weld solidifiation cracking in varestraint tests of alloy 718
2019 (English)In: / [ed] C. Sommitsch, Gratz, 2019, Vol. 12, p. 485-504Conference paper, Published paper (Refereed)
Abstract [en]

Several nickel-based superalloys are susceptible to weld solidification cracking. Numerical simulation can be a powerful tool for optimizing the welding process such that solidification cracking can be avoided. In order to simulate the cracking, a crack model inspired by the RDG model is proposed. The model is based on a crack criterion that estimates the likelihood for a preexisting pore in a grain boundary liquid film to form a crack. The criterion depends on the thickness and the liquid pressure in the grain boundary liquid film, as well as the surface tension of the pore. The thickness of the liquid film is computed from the macroscopic mechanical strain field of an FE model with a double ellipsoidal heat source. A temperature-dependent length scale is used to partition the macroscopic strain to the liquid film. The liquid pressure in the film is evaluated using a combination of Poiseuille parallel plate flow and Darcy’s law for porous flows. The Poiseuille flow is used for the part of the grain boundary liquid film that extends into the region with liquid fraction less than 0.1, while Darcy’s law is used for the rest of the liquid film that extends into the regions with liquid fraction greater than 0.1. The proposed model was calibrated and evaluated in Varestraint tests of Alloy 718. Crack location, width, and orientation were all accurately predicted by the model.

Place, publisher, year, edition, pages
Gratz: , 2019
Series
Mathematical Modelling of Weld Phenomena, ISSN 2410-0544 ; 12
Keywords
Solidification cracking, Hot cracking, Varestraint testing, Computational Welding Mechanics, Alloy 718
National Category
Manufacturing, Surface and Joining Technology
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-75740 (URN)10.3217/978-3-85125-615-4-26 (DOI)978-3-85125-615-4 (ISBN)
Conference
Mathematical Modelling of Weld Phenomena
Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2019-10-17
Edberg, J. & Draxler, J. (2018). Comarison of two different indicators for hot cracking in welded structures. In: : . Paper presented at 31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018; Belo Horizonte; Brazil; 9 September 2018 through 14 September 2018.
Open this publication in new window or tab >>Comarison of two different indicators for hot cracking in welded structures
2018 (English)Conference paper (Refereed)
Identifiers
urn:nbn:se:ltu:diva-72832 (URN)
Conference
31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018; Belo Horizonte; Brazil; 9 September 2018 through 14 September 2018
Available from: 2019-02-08 Created: 2019-02-08 Last updated: 2019-02-08
Fisk, M., Lundbäck, A., Edberg, J. & Zhou, J. (2016). Simulation of microstructural evolution during repair welding of an IN718 plate (ed.). Finite elements in analysis and design (Print), 120, 92-101
Open this publication in new window or tab >>Simulation of microstructural evolution during repair welding of an IN718 plate
2016 (English)In: Finite elements in analysis and design (Print), ISSN 0168-874X, E-ISSN 1872-6925, Vol. 120, p. 92-101Article in journal (Refereed) Published
Abstract [en]

A precipitate evolution model based on classical nucleation, growth and coarsening theory is adapted and solved using the multi-class approach for the superalloy IN718. The model accounts for dissolution of precipitates and is implemented in a finite element program. The model is used to simulate precipitate evolution in the fused zone and the adjacent heat affected zone for a welding simulation. The calculated size distribution of precipitates is used to predict Vickers hardness. The simulation model is compared with nanoindentation experiments. The agreement between simulated and measured hardness is good.

National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-9647 (URN)10.1016/j.finel.2016.07.007 (DOI)000382296400007 ()2-s2.0-84979642371 (Scopus ID)8506a51a-a8b8-470f-a3b1-bb192f2b46fd (Local ID)8506a51a-a8b8-470f-a3b1-bb192f2b46fd (Archive number)8506a51a-a8b8-470f-a3b1-bb192f2b46fd (OAI)
Note

Validerad; 2016; Nivå 2; 20160816 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Edberg, J. & Andersson, J. (2016). Use of Indicators for Hot and Warm Cracking in Welded Structures. Paper presented at International Conference on Sustainable Materials Processing and Manufacturing, SMPM 2017, 23-25 January 2017, Kruger. Procedia Manufacturing, 7, 145-150
Open this publication in new window or tab >>Use of Indicators for Hot and Warm Cracking in Welded Structures
2016 (English)In: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 7, p. 145-150Article in journal (Refereed) Published
Abstract [en]

Weight reduction of mechanical components is becoming increasingly important as a way to provide more environment friendly production and operation of different equipment. This is true in almost any manufacturing industry, but is especially important to the aerospace industry. Casting has often been replaced by hot and cold metal working operations and welding, usually including an additional heat treatment. This gives components better material properties and provides components with less weight and cost but with increased strength and efficiency. This may even be true for rotating Ni- based superalloy components, and is enabled by welding methods. However, weld cracking of precipitation hardening Ni-based superalloys is a serious problem, both in manufacturing and overhaul since it endangers component life if cracks are allowed to propagate.

Cracks can appear in a weld and in it's surroundings. The triggering mechanisms depend on its location and when it is nucleated. Generally saying, weld cracking in precipitation hardening Ni-based superalloys consists of two different types of cracking, hot cracking and warm cracking which may be further divided into heat affected zone (HAZ) liquation cracking, solidification cracking and strain age cracking, respectively.

Finite element simulations of welding and heat treatment processes started in the seventies for small laboratory set-up cases and have today matured, and are now used on large-scale structures like aerospace components. But FE-based crack criteria that can predict the risk of cracking due to welding or heat treatments are rare. In a recent study both hot cracking and warm cracking have been investigated in Ni-based superalloys, and two FE-based indicators showing the risk of hot and warm cracks have been proposed. The objective of the investigation presented in this paper is to compare results from FE-simulations with experimental results from weldability tests, like the Varestraint test and the high temperature mechanical Gleeble test.

National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-61269 (URN)10.1016/j.promfg.2016.12.038 (DOI)000398151100024 ()2-s2.0-85010219853 (Scopus ID)
Conference
International Conference on Sustainable Materials Processing and Manufacturing, SMPM 2017, 23-25 January 2017, Kruger
Note

2016-12-27 (andbra);Konferensartikel i tidskrift

Available from: 2016-12-27 Created: 2016-12-27 Last updated: 2018-08-06Bibliographically approved
Lindgren, M., Edberg, J. & Lindgren, L.-E. (2015). Roll Forming (ed.). In: (Ed.), Andrew Nee (Ed.), Handbook of Manufacturing Engineering and Technology: (pp. 285-307). Paper presented at . London: Encyclopedia of Global Archaeology/Springer Verlag
Open this publication in new window or tab >>Roll Forming
2015 (English)In: Handbook of Manufacturing Engineering and Technology, London: Encyclopedia of Global Archaeology/Springer Verlag, 2015, p. 285-307Chapter in book (Refereed)
Abstract [en]

Roll forming is cost-effective compared to other sheet metal forming processes for uniform profiles. The process has during the last 10 years developed into forming of profiles with varying cross sections and is thereby becoming more flexible. The motion of the rolls can now be controlled with respect to many axes enabling a large variation in the profiles along the formed sheet, the so-called 3D roll forming or flexible roll forming technology. The roll forming process has also advantages compared to conventional forming for high-strength materials. Furthermore, computer tools supporting the design of the process have also been developed during the last 10 years. This is quite important when designing the forming of complex profiles. The chapter describes the roll forming process, particularly from the designer’s perspective. It gives the basic understanding of the process and how it is designed. Furthermore, modern computer design and simulation tools are discussed

Place, publisher, year, edition, pages
London: Encyclopedia of Global Archaeology/Springer Verlag, 2015
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-20246 (URN)10.1007/978-1-4471-4670-4_43 (DOI)2-s2.0-84948732466 (Scopus ID)336c2af4-cf77-47a7-af69-e4bfa73a67c2 (Local ID)978-1-4471-4669-8 (ISBN)978-1-4471-4670-4 (ISBN)336c2af4-cf77-47a7-af69-e4bfa73a67c2 (Archive number)336c2af4-cf77-47a7-af69-e4bfa73a67c2 (OAI)
Note
Godkänd; 2015; 20150902 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7298-020x

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