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  • Resultat 44611-44620 av 53538
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44611.
  • Steffenburg-Nordenström, Joachim, 1962-, et al. (författare)
  • Comparison of forming, welding and heat treatment simulations in LS-DYNA and MSC Marc
  • 2016
  • Ingår i: Proceedings of 10th International Conference on Trends in Welding Research & 9th International Welding Symposium of Japan Welding, American Welding Society (AWS) & Japan Welding Society (JWS). - : American Welding Society (AWS) & Japan Welding Society (JWS). - 9781510844032 ; , s. 660-663, s. 660-663
  • Konferensbidrag (refereegranskat)abstract
    • The manufacturing of components for aero engine structures from a flat sheet to the final shape usually requires several steps that may introduce residual stresses and shape distortions in the part. Depending on the magnitude, sign and distribution with respect to the stresses induced by the service load, the remaining stresses may affect the service life of a component, especially when submitted to cyclic loading. Nowadays, several types of software that have the ability to predict the residual stresses and the final shape of a component subjected to various process steps are available. However, literature shows a lack of comparison studies among different software tools for multi-step simulations of a manufacturing process. In this study, the manufacturing process chain of an aerospace component including forming, welding and heat treatment in the nickel-based superalloy 718 is modelled and simulated using the two finite element software codes LS-DYNA and MSC.Marc. The results from the displacement of the blank in the punch stroke direction, the equivalent plastic strain and the von Mises stress are compared between both FE codes. The displacement of the blank after forming is slightly higher in LS-DYNA compared to MSC.Marc, as well as the equivalent plastic strain and the von Mises stress values. This tendency is also observed after trimming and welding. It can also be noted that the distribution of both strains and stresses on the trimmed and welded parts varies between the two compared codes, presumably due to the choice of different solver options, explicit and implicit.
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44612.
  • Steg, Linda, et al. (författare)
  • A Research Agenda to Better Understand the Human Dimensions of Energy Transitions
  • 2021
  • Ingår i: Frontiers in Psychology. - : Frontiers Media S.A.. - 1664-1078. ; 12
  • Tidskriftsartikel (refereegranskat)abstract
    • The Social Sciences and Humanities (SSH) have a key role to play in understanding which factors and policies would motivate, encourage and enable different actors to adopt a wide range of sustainable energy behaviours and support the required system changes and policies. The SSH can provide critical insights into how consumers could be empowered to consistently engage in sustainable energy behaviour, support and adopt new technologies, and support policies and changes in energy systems. Furthermore, they can increase our understanding of how organisations such as private and public institutions, and groups and associations of people can play a key role in the sustainable energy transition. We identify key questions to be addressed that have been identified by the Platform for Energy Research in the Socio-economic Nexus (PERSON, see person.eu), including SSH scholars who have been studying energy issues for many years. We identify three main research themes. The first research theme involves understanding which factors encourage different actors to engage in sustainable energy behaviour. The second research theme focuses on understanding which interventions can be effective in encouraging sustainable energy behaviour of different actors, and which factors enhance their effects. The third research theme concerns understanding which factors affect public and policy support for energy policy and changes in energy systems, and how important public concerns can best be addressed as to reduce or prevent resistance.
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44613.
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44614.
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44615.
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44616.
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44617.
  • Stehn, Lars, et al. (författare)
  • Byggandet av flervåningshus i trä : erfarenheter efter tre års observation av träbyggandets utveckling
  • 2008
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • This report is a summary and analysis of the knowledge gained from the activities carried out 2006 - 2008 within "Nationella träbyggnadsstrategins fortbildningsprogram". Expert knowledge and results are also included from the many corresponding R&D programs, aimed to support and develop timber housing construction, which was run parallel to "Nationella träbyggnadsstrategin"."Fortbildningsprogrammet" - the program for further education of actors in the housing industry was a cooperative effort between: Luleå university of technology, Vaxjö university, Dalarna university and the institute SP Trätek.The chapters of the report are written by different authors from the universities and institute.The report describes: The building technique and competence development that have taken place within the Swedish timber housing industry (viewed in a wide context). - Three types of structural systems exist on the market today (column-beam systems, massive wood elements and timber frame systems). These are combined and erected using three different types of construction methods (on-site construction, prefabricated elements and prefabricated volume elements).- During the program, seminars, workshops and study tours were attended by approximately 750 people representing construction clients, architects, designers and construction companies. In depth case results are presented and analysed from 15 different building projects that give valuable information for other projects and it is also estimated that more than 10 other projects was initiated as an effect of the program.As an important by-effect, it is noted that the undertaking and existence of the program gave additional support to the development of research groups with focus on timber housing construction.In-depth case descriptions of timber house projects with a focus on those in Växjö, Falun och Skellefteå. - Detailed descriptions and analyses regarding: Design aspects, architectural limitations, descriptions of technical solutions for adequate fire, acoustics and horizontal stabilising. Details for several structural elements are presented and experience and further development of the logistics and the montage employed are analysed.- Detailed descriptions and analyses regarding: Design aspects, architectural limitations, descriptions of technical solutions for adequate fire, acoustics and horizontal stabilising. Details for several structural elements are presented and experience and further development of the logistics and the montage employed are analysed. Scientifically based systems descriptions of industrialised timber housing.- A characterisation of the building technique is presented. - A description and analysis of the growth and potential of the multi-storey industrialised housing industry is given.- Analysis of different actor's roles, business models including a definition of industrialised housing (the process) is displayed.The report concludes with guidance instructions aimed for all actors involved in a housing project.
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44618.
  • Stehn, Lars, et al. (författare)
  • Bättre affärsmodeller ger effektivare träbygge
  • 2007
  • Ingår i: Husbyggaren : bygg, el, VVS, anläggning. - 0018-7968. ; :2, s. 4-6
  • Tidskriftsartikel (populärvet., debatt m.m.)abstract
    • Det finns en potential för ett industrialiserat byggande i trä. Men affärsmodellerna för flerfamiljshus saknar fortfarande företagsekonomisk stabilitet. Aktörerna behöver satsa på forskning och utveckling.
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44619.
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44620.
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