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- Avango, Dag, et al.
(författare)
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The making and re-making of high modernist towns in the Circumpolar North
- 2022
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Ingår i: The Extractive Industries and Society. - : Elsevier. - 2214-790X .- 2214-7918. ; 12
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Tidskriftsartikel (refereegranskat)abstract
- In this article we explore the fate of high modernist architecture and settlement planning in the North, through the lens of mining towns in Sweden and Quebec. After WW2, cities across the world were subject to a wave of restructuring in accordance with high modernist ideals. The circumpolar north became the subject of some of the most radical examples, often described as utopian. In the Swedish Arctic, a renowned architect Ralph Erskine played a leading role. He combined functionalist principles, with ideas of creating settlements protecting inhabitants from harsh Arctic conditions, in harmony with the environment. Erskine...s ideas were implemented to a different extent in Kiruna and Svappavaara in north Sweden in the 1960's and in Fermont, Quebec, in the early 1970's. Our aim is to understand the challenges of creating industrial settlements in the Arctic, with the capacity to attract employees that are needed for resource extraction and other industries. While Erskine's architecture in Svappavaara and Kiruna will be demolished, the wall shaped town in Fermont is still intact and expanding. By comparing and highlighting differences, we call attention to the threat of demolition of legacies of an era that has yet to be defined as cultural heritage.
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- Azizoğlu, Yağız, 1986-, et al.
(författare)
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Finite Element Analysis of cold pilgering using elastic roll dies
- 2017
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Ingår i: Procedia Engineering. - : Elsevier. - 1877-7058. ; 207, s. 2370-2375
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Tidskriftsartikel (refereegranskat)abstract
- A finite element model of cold pilgering with elastic roll dies have been developed and used to investigate the influence of roll die deformation on the material flow, contact region, roll separating force and tube dimensions. Full scale experiments were performed to validate the contact surface and tube dimensions. The results show that the influence of roll die flattening is not significant on the contact length. However, elastic deformation of roll die has strong influence on both the wall thickness reduction and roll separating force. Thus it is recommended to consider elasticity of roll dies when forces and tube dimensions are estimated.
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- Azizoğlu, Yağız, et al.
(författare)
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Finite element modeling of tube deformation during cold pilgering
- 2016
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Ingår i: MATEC Web of Conferences. - : EDP Sciences. ; , s. 1-8
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Konferensbidrag (refereegranskat)abstract
- A three-dimensional finite element model of cold pilgering of stainless steel tubes is developed in this paper. The objective is to use the model to increase the understanding of forces and deformations in the process. The focus is on the influence of vertical displacements of the roll stand and axial displacements of the mandrel and tube. Therefore, the rigid tools and the tube are supported with elastic springs. Additionally, the influences of friction coefficients in the tube/mandrel and tube/roll interfaces are examined. A sensitivity study is performed to investigate the influences of these parameters on the strain path and the roll separation force. The results show the importance of accounting for the displacements of the tube and rigid tools on the roll separation force and the accumulative plastic strain.
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- Azizoğlu, Yağız, et al.
(författare)
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Finite element modelling of cold pilgering of tubes
- 2015
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Ingår i: Proceedings of the 8th International Conference on Computational Plasticity - Fundamentals and Applications, COMPLAS 2015. - Barcelona : International Center for Numerical Methods in Engineering (CIMNE). - 9788494424465 ; , s. 716-726
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Konferensbidrag (refereegranskat)abstract
- Cold pilgering is a cold forming process used during manufacturing of seamless tubes. The tube with a mandrel inside is fed forward and rotated in stepwise increments, while the roll stand moves back and forth. The total plastic deformation of the tube is such that the cross-sectional area of the tube decreases and the length of the tube increases during the process. However, this is performed in many small incremental steps, where the direction of deformation in a material point changes at each stroke. Most published models of cold pilgering use simplified material models. In reality, the flow stress is dependent on temperature, strain rate, strain history and microstructure. In this work, temperature and strain rate distributions are computed, using a 3D thermo-mechanical FE model, and the influence of temperature and strain rate on the rolling force is investigated. The Johnson-Cook model is employed to describe the flow stress using isotropic hardening. The results show that strain rate and temperature have a significant influence on the roll separation force.
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- Azizoğlu, Yağız, 1986-
(författare)
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Modeling of Cold Pilgering of Tubes
- 2017
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Cold pilgering is a challenging tube forming process in terms of modeling due to the complexity in kinematic of tools, friction condition and material behavior. The process development has mostly been based on simple formulas and costly full-scale tryouts. The aim in this study is to develop validated Finite element models of cold pilgering to increase the understanding of influence of the process parameters on the produced tubes.In the course of this thesis, three-dimensional mechanical and thermo-mechanical Finite element models of cold pilgering were developed. The commercial code MSC.Marc was used in the simulations. General 3D models are needed to be able to capture asymmetric deformation in cold pilgering. It was found that tool deflections together with elastic deformation of roll dies have considerable influence on the rolling force. Furthermore, the strain rate and temperature effects on the response of the material and thereby on the rolling force were evaluated.
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- Azizoğlu, Yağız, 1986-, et al.
(författare)
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Work hardening during alternating load directions of 316L SS
- 2018
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Ingår i: Proceedings of the 17th International Conference on Metal Forming METAL FORMING 2018 September 16 – 19, 2018, Loisir Hotel Toyohashi, Toyohashi, Japan. - : Elsevier. ; 15, s. 1777-1784
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Konferensbidrag (refereegranskat)abstract
- Understanding and modelling the plastic behavior of a material are essential for simulation and design of metal forming processes. Cold pilgering of tubes is a process with very complex strain history with alternating loading direction. This makes evaluation of the work hardening challenging. Cold deformation applied in a single direction predominantly exhibit work hardening, while changes of the loading direction may even cause softening in other directions. The influence of alternating loading directions on work hardening has been experimentally investigated for 316L stainless steel (SS). Cubic specimens were cut out from the preform of the tube. The specimens are subjected to uniaxial compressions in alternating directions along two perpendicular axes. From the results, a cyclic elastic-plastic constitutive model based on a Chaboche-type approach is calibrated and implemented in the commercial finite element code MSC.Marc.
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| 10. |
- Baxter, Rebecca, et al.
(författare)
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COVID-19 : Opportunities for interdisciplinary research to improve care for older people in Sweden
- 2021
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Ingår i: Scandinavian Journal of Public Health. - : Sage Publications. - 1403-4948 .- 1651-1905. ; 49:1, s. 29-32
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Tidskriftsartikel (refereegranskat)abstract
- The emergence of COVID-19 has changed the world as we know it, arguably none more so than for older people. In Sweden, the majority of COVID-19-related fatalities have been among people aged ⩾70 years, many of whom were receiving health and social care services. The pandemic has illuminated aspects within the care continuum requiring evaluative research, such as decision-making processes, the structure and organisation of care, and interventions within the complex public-health system. This short communication highlights several key areas for future interdisciplinary and multi-sectorial collaboration to improve health and social care services in Sweden. It also underlines that a valid, reliable and experiential evidence base is the sine qua non for evaluative research and effective public-health systems.
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