Ändra sökning
Avgränsa sökresultatet
1 - 7 av 7
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Barlo, A
    et al.
    Blekinge Institute of Technology, Sweden.
    Sigvant, M
    Blekinge Institute of Technology, Sweden; Volvo Cars, Sweden.
    Pérez Caro, Lluís
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Islam, M S
    Blekinge Institute of Technology, Sweden.
    Pilthammar, J
    Blekinge Institute of Technology, Sweden; Volvo Cars, Sweden.
    A Study of the Boundary Conditions in the ISO-16630 Hole Expansion Test2022Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 1238, artikel-id 012031Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    As new and more advanced sheet metal materials are introduced to the market, more accurate techniques for determination of failure limits are needed. One area that needs attention is edge formability, where the ISO-16630 standardized Hole Expansion Test currently is used to express this through the Hole Expansion Ratio. Over the years, this standard has been criticized for producing a large scatter in repeated tests. This paper investigates a new setup for the Hole Expansion Test which introduces draw beads into the setup to ensure sufficient restraining of the specimen during the test in an effort to reduced the scatter. In total 62 tests of a DP800 steel alloy were executed, but a large scatter in the results were still seen. It was therefore concluded that a lack of restraining force in the Hole Expansion Test was not the primary cause of the reported scatter seen in other tests.

  • 2.
    Odenberger, Eva-Lis
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF. Luleå University of Technology, Sweden.
    Perez Caro, Lluis
    RISE - Research Institutes of Sweden, Material och produktion, IVF. Luleå University of Technology, Sweden.
    Ņhlin, Hans
    Luleå University of Technology, Sweden.
    Oldenburg, Mats
    Luleå University of Technology, Sweden.
    Thermo-mechanical Material Characterization and Stretch-bend Forming of AA60162018Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 418, nr 1Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Lightweight design has become increasingly in focus for the manufacturing industry. Global environmental challenges, goals and legislations imply that lighter and sustainable products are imperative to remain competitive. One example is stamped products made of aluminum alloys which are of interest to the automotive industry, where lightweight designs are essential. In order to increase formability and to produce more complex geometries in stamped aluminum components there is a need to develop hot forming techniques. The Finite Element Method (FEM) has enabled important advances in the study and design of competitive manufacturing procedures for metal parts. Predicting the final geometry of a component is a complex task, especially if the forming procedure occurs at elevated temperatures. This work presents selected results from thermo-mechanical material testing procedures, FE-analyses and forming validation tests in AA6016 material. The material tests are used to determine the thermo-mechanical anisotropic properties, strain rate sensitivity and formability (Forming Limit Curves, FLC) at temperatures up to 490°C. Stretch-bending tests are performed to compare predicted results with experimental observations such as punch force, strain levels, thinning, forming temperatures, springback and failure. It was found that the heat-treatment and forming at elevated temperatures substantially increased formability and that measured responses could in general be predicted if care was taken to model the initial blank temperatures, heat transfer and thermo-mechanical material properties. The room temperature case confirms the importance of considering anisotropy. © Published under licence by IOP Publishing Ltd.

  • 3.
    Ottosson, Peter
    et al.
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Pilthammar, J
    Blekinge Institute of Technology, Sweden; Volvo Cars, Sweden.
    Wiklund, Daniel
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Skåre, Thomas
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Sigvant, M
    Blekinge Institute of Technology, Sweden; Volvo Cars, Sweden.
    Substitutive models of press deflections for efficient numerical die cambering2023Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 1284, nr 1, s. 012060-012060Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Cost and time for stamping die tryouts are significant within the car industry. A major contributing factor is that elastic deflections of stamping dies and presses are usually not considered during the virtual die design and forming simulation phase. Active surfaces of stamping dies are only cambered based on previous experiences of tool types and stamping presses. However, almost all stamping dies and presses are unique, and available experiences are not valid for new sheet materials. This leads to component deviations and often several loops of tool adjustments are needed. Previously partners within the SMART Advanced Manufacturing research project CAMBER have developed advanced deflection measuring devices to quantify the elastic deformations of stamping presses. Using these measurements, cambering methodologies can be utilized in sheet metal forming simulations. In this paper numerical substitutive stamping press models are described which are capable of compensating for measured stamping press dynamics. The result show that a numerical compensated tool can improve the contact by over 80% compared to the corresponding contact without compensation.

    Ladda ner fulltext (pdf)
    fulltext
  • 4.
    Pilthammar, Jan
    et al.
    Volvo Cars, Sweden; Blekinge Institute of Technology, Sweden.
    Skåre, Thomas
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Galdos, L.
    Mondragon Unibertsitatea, Spain.
    Frojdh, K.
    Proximion AB, Sweden.
    Ottosson, Peter
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Wiklund, Daniel
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Carlholmer, Jonathan
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Sigvant, M.
    Volvo Cars, Sweden; Blekinge Institute of Technology, Sweden.
    Ohlsson, M.
    RISE Research Institutes of Sweden.
    Argandoña, E. Sáenz de
    Mondragon Unibertsitatea, Spain.
    Abbasi, F.
    Mondragon Unibertsitatea, Spain.
    Sarasua, O.
    Fagor Arrasate S. Coop, Spain.
    Garro, A.
    Koniker S. Coop, Spain.
    Rutgersson, W.
    Cascade control AB, Sweden.
    New press deflection measuring methods for the creation of substitutive models for efficient die cambering2021Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 1157, artikel-id 012076Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Cost and time for die tryout are significant within the car industry, and elastic deflections of dies and presses are most commonly not considered during the virtual die design and forming simulation phase. Because of this, active surfaces of stamping dies are only cambered based on previous experiences of tool types and presses. However, almost all stamping dies and presses are unique, and available experiences are not valid for new materials. Partners within the Eureka SMART Advanced Manufacturing research project CAMBER have developed advanced deflection measuring devices to quantify the elastic deformations of presses. Using these measurements, cambering methodologies can be utilized in sheet metal forming simulations. Important breakthroughs in recent years enabling the cambering methodology consists of efficient simulation strategies for full scale simulations with elastic dies and optimization techniques for creating substitutive press structures based on measurements. Furthermore, modern press deflection measurement methods are beneficial in applications such as Industry 4.0, predictive maintenance, product quality control, etc. through a more advanced understanding and live monitoring of the press system.

  • 5.
    Schmerler, R
    et al.
    Fraunhofer, Germany.
    Drebenstedt, C
    Fraunhofer, Germany.
    Machhammer, M
    AP&T Sweden AB, Sweden.
    Gong, Guan
    RISE Research Institutes of Sweden, Material och produktion, Polymera material och kompositer.
    Wolf, P
    FiberCheck GmbH, Germany.
    Multi-functional SMC-aluminum battery tray to drive lightweight design2023Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, 012046, Vol. 1284, nr 1, artikel-id 012046Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Functional integration and lightweight design are important tasks especially for modern electric vehicles. Development of multi-functional assemblies for the battery box of the future is one of the challenges in the field of electric mobility. The housing must perform many tasks: structural stiffening and sealing (waterproofness) as well as crash protection and thermal management for the batteries. In this paper results from a new developed multi-functional assembly of a SMC-aluminum battery tray will be presented and discussed. The outer housing shell is manufactured by forming SMC directly on an aluminum sandwich component in one stroke compression molding. Furthermore, passive temperature control functions are integrated into the core of the aluminum sandwich realized with switchable air-cooling and phase-change-material integrated into the foam. Additionally, sensors for structural health monitoring, temperature and humidity are integrated. Finally the process design and manufacturing tests will be explained.

  • 6.
    Varna, J.
    et al.
    Luleå University of Technology, Sweden.
    Zrida, H.
    Luleå University of Technology, Sweden.
    Fernberg, P.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, SICOMP. Luleå University of Technology, Sweden.
    Microdamage analysis in thermally aged CF/polyimide laminates2016Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 139, nr 1, artikel-id 012050Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Microdamage in layers of CF Thornel® T650 8-harness satin woven composite with thermosetting polyimide NEXIMID® MHT-R resin was analysed. After cooling to room temperature multiple intra-bundle cracking due to tensile transverse thermal stresses was observed in the studied [(+45/-45)/(90/0)]2s composite. The composite was subjected to thermal cycling quantifying the increase of crack density in layers. Comparison of two ramps with the same lowest temperature shows that the highest temperature in the cycle has a significant detrimental effect. Exposure for 40 days to 288°C caused many new cracks after cooling down to room temperature. Both aged and not aged specimens were tested in uniaxial quasi-static tension. Cracking was analysed using fracture mechanics and probabilistic approaches. Cracking in off-axis layers was predicted based on Weibull analysis of the 90- layer. The thermal treatment degraded the cracking resistance of the surface layer and of the next layer.

    Ladda ner fulltext (pdf)
    fulltext
  • 7.
    Wiklund, Daniel
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB, Tillverkningsprocesser.
    Larsson, Mats
    University College West, Sweden.
    Phenomenological friction model in deep drawing of aluminum sheet metals2018Ingår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 418, nr 1Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Friction is an important parameter in sheet metal forming since it influences the flow of material in the process. Consequently, it is also an important parameter in the design process of new stamping dies when numerical simulations are utilized. Today, the most commonly used friction model in forming simulations is Coulomb’s friction which is a strong simplification of the tribological system conditions and a contributory cause of discrepancy between simulation and physical experiments. There are micromechanical models available but with an inherent complexity that results in limited transparency for users. The objective in this study was to design a phenomenological friction model with a natural level of complexity when Coulomb’s friction is inadequate. The local friction model considers implicit properties of tool and sheet surface topography, lubricant viscosity, sheet metal hardness and strain, and process parameters such as sliding speed and contact pressure. The model was calibrated in a Bending-Under-Tension test (BUT) and the performance was evaluated in a cross shaped geometry (X-die). The results show a significant improvement of the simulation precision and provide the user a transparent tribological system. © Published under licence by IOP Publishing Ltd.

1 - 7 av 7
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf