Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 19) 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
Show others...
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
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: 2019-06-11Bibliographically approved
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
Lindgren, M., Edberg, J. & Lindgren, L.-E. (2014). Roll Forming (ed.). In: (Ed.), Andrew Nee (Ed.), Handbook of Manufacturing Engineering and Technology: (pp. 1-19). Paper presented at . London: Encyclopedia of Global Archaeology/Springer Verlag
Open this publication in new window or tab >>Roll Forming
2014 (English)In: Handbook of Manufacturing Engineering and Technology, London: Encyclopedia of Global Archaeology/Springer Verlag, 2014, p. 1-19Chapter 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, 2014
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-20957 (URN)10.1007/978-1-4471-4976-7_43-1 (DOI)9a4fe6c9-d360-4840-ac40-5ff1edce474d (Local ID)978-1-4471-4976-7 (ISBN)9a4fe6c9-d360-4840-ac40-5ff1edce474d (Archive number)9a4fe6c9-d360-4840-ac40-5ff1edce474d (OAI)
Note
Godkänd; 2014; 20140820 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-06Bibliographically approved
Lindgren, L.-E., Lundbäck, A., Edberg, J. & Svoboda, A. (2013). Challenges in finite element simulations of chain of manufacturing processes (ed.). In: (Ed.), L. Pentti Karjalainen; David A. Porter; Seppo A. Järvenpää (Ed.), Physical and numerical simulation of materials processing VII: selected, peer reviewed papers from the 7th International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS'13), June 16-19, 2013, Oulu, Finland. Paper presented at International Conference on Physical and Numerical Simulation of Materials Processing : 16/06/2013 - 19/06/2013 (pp. 349-353). Durnten-Zurich: Trans Tech Publications Inc.
Open this publication in new window or tab >>Challenges in finite element simulations of chain of manufacturing processes
2013 (English)In: Physical and numerical simulation of materials processing VII: selected, peer reviewed papers from the 7th International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS'13), June 16-19, 2013, Oulu, Finland / [ed] L. Pentti Karjalainen; David A. Porter; Seppo A. Järvenpää, Durnten-Zurich: Trans Tech Publications Inc., 2013, p. 349-353Conference paper, Published paper (Refereed)
Abstract [en]

Simulation of some, or all, steps in a manufacturing chain may be important for certain applications in order to determine the final achieved properties of the component. The paper discusses the additional challenges in this context

Place, publisher, year, edition, pages
Durnten-Zurich: Trans Tech Publications Inc., 2013
Series
Materials Science Forum, ISSN 0255-5476 ; 762
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-30254 (URN)10.4028/www.scientific.net/MSF.762.349 (DOI)000324149300053 ()2-s2.0-84880814278 (Scopus ID)40509b7e-18be-4f01-a9c4-770c4ee82f9b (Local ID)9783037857281 (ISBN)40509b7e-18be-4f01-a9c4-770c4ee82f9b (Archive number)40509b7e-18be-4f01-a9c4-770c4ee82f9b (OAI)
Conference
International Conference on Physical and Numerical Simulation of Materials Processing : 16/06/2013 - 19/06/2013
Note
Validerad; 2013; 20130814 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-07-10Bibliographically approved
Liu, J., Edberg, J., Tan, M., Lindgren, L.-E., Castagne, S. & Jarfors, A. (2013). Finite element modelling of superplastic-like forming using a dislocation density-based model for AA5083 (ed.). Paper presented at . Modelling and Simulation in Materials Science and Engineering, 21(2), 25006
Open this publication in new window or tab >>Finite element modelling of superplastic-like forming using a dislocation density-based model for AA5083
Show others...
2013 (English)In: Modelling and Simulation in Materials Science and Engineering, ISSN 0965-0393, E-ISSN 1361-651X, Vol. 21, no 2, p. 25006-Article in journal (Refereed) Published
Abstract [en]

Superplastic-like forming is a newly improved sheet forming process that combines the mechanical pre-forming (also called hot drawing) with gas-driven blow forming (gas forming). Non-superplastic grade aluminium alloy 5083 (AA5083) was successfully formed using this process. In this paper, a physical-based material model with dislocation density and vacancy concentration as intrinsic foundations was employed. The model describes the overall flow stress evolution of AA5083 from ambient temperature up to 550 °C and strain rates from 10−4 up to 10−1 s−1. Experimental data in the form of stress–strain curves were used for the calibration of the model. The calibrated material model was implemented into simulation to model the macroscopic forming process. Hereby, finite element modelling (FEM) was used to estimate the optimum strain-rate forming path, and experiments were used to validate the model. In addition, the strain-rate controlled forming was conducted for the purpose of maintaining the gas forming with an average strain rate of 2 × 10−3 s−1. The predicted necking areas closely approximate the localized thinning observed in the part. Strain rate gradients as a result of geometric effects were considered to be the main reason accounting for thinning and plastic straining, which were demonstrated during hot drawing and gas forming by simulations.

National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-5723 (URN)10.1088/0965-0393/21/2/025006 (DOI)000315186900006 ()2-s2.0-84874310241 (Scopus ID)3e682280-1d20-4c4b-845f-240c0f0fd861 (Local ID)3e682280-1d20-4c4b-845f-240c0f0fd861 (Archive number)3e682280-1d20-4c4b-845f-240c0f0fd861 (OAI)
Note
Validerad; 2013; Bibliografisk uppgift: Article no 025006; 20130131 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Edberg, J., Larsson, D. & Lindgren, L.-E. (2003). Simulation of braking of railway wheel (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Simulation of braking of railway wheel
2003 (English)Report (Other academic)
Abstract [en]

LKAB has tried new iron ore wagons for the 30 tonnes axle load. They got problems with cracking and material removal from the rim of the wheels during the tests. Martensite, which is more prone to cracking than other microstructures, was found at these locations. The initial material microstructure is supposed to contain no martensite. The purpose of this investigation is to find whether the thermal cycle due to braking, possibly with assistance of the mechanical load, can cause martensite formation

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2003
Series
Research report / Luleå University of Technology, ISSN 1402-1528 ; 2003:05
National Category
Other Civil Engineering Other Materials Engineering
Research subject
Operation and Maintenance; Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-24032 (URN)9645e310-fc74-11db-b816-000ea68e967b (Local ID)9645e310-fc74-11db-b816-000ea68e967b (Archive number)9645e310-fc74-11db-b816-000ea68e967b (OAI)
Note
Godkänd; 2003; 20070507 (margjo)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-06Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7298-020x

Search in DiVA

Show all publications