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  • 1.
    Dugic, Izudin
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Berndt, Robin
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Josefsson, Simon
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Hedström, Martin
    China Euro Vehicle Technology AB, Sweden.
    Non-metallic inclusion and their effect on fatigue strength for case-hardened carbon steel in gears2018In: TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018, Springer, 2018, p. 123-133Conference paper (Refereed)
    Abstract [en]

    Steel is a very essential structural material and its production worldwide has shown significant increase over the last years. In steels there always exist a large number of inclusions which can have a degrading effect on the fatigue properties. This study is focused on the link between the characteristics of non-metallic inclusions and how they affect fatigue strength of the standardized case-hardened carbon steel 20MnCr5 and a version of this steel with a more favorable inclusion distribution, a so-called Clean steel. For the evaluation of the mechanical properties the test result from rotary bending tests are compared and an improvement by 37.5% in fatigue strength can be noted between the different steels. The new performed ultrasonic tests illustrate the difference in the size of defects in materials with different manufacturing processes and degree of reduction. By studying international and European standards for non-destructive testing and investigation of alloy compounds, the current material specification can be adjusted. © The Minerals, Metals & Materials Society 2018.

  • 2.
    Fawaz, Fadi
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Konstruktion av ett nötningssystem för olika stålmaterial.2016Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    I deatta arbete har olika nötningstyper identifierats vilka entreprenadmaskiners skopor utsätts för. Utifrån de dominerande nötningstyperna ska en nötningsprovrigg konstrueras som behandlar dessa. Detta då företaget Borox som förser entreprenad och vägindustrin med slitstarka stålmaterial ska kunna testa sina material och få en relativ uppskattning om nötningsbeständighet och lämplighet på sina produkter. 

    En produktutvecklingsprocess följdes under arbetet och en lämplig provrigg valdes för att sedan konstrueras och ritas..

  • 3.
    Hellberg, Edwin
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Sundström, Fredrik
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Användning av direktuppkopplade oljesensorer på fartyg2019Independent thesis Basic level (university diploma), 180 HE creditsStudent thesis
  • 4.
    Silva-Magalhães, Ana
    et al.
    University West, Sweden.
    De Backer, Jeroen
    University West, Sweden;TWI Ltd, UK.
    Martin, Jonathan
    TWI Ltd, UK.
    Bolmsjö, Gunnar
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    In-situ temperature measurement in friction stir welding of thick section aluminium alloys2019In: Journal of Manufacturing processes, ISSN 1526-6125, Vol. 39, p. 12-17Article in journal (Refereed)
    Abstract [en]

    Friction stir welding (FSW) is a reliable joining technology with a wide industrial uptake. However, several fundamentals of the process such as the temperature inside the stirred zone of the weld and its influence on mechanical properties, are not yet fully understood. This paper shows a method for accurate temperature measurements in multiple locations around the tool, to identify the location of the peak temperature, the temperature variations between the advancing and the retreating side of the tool and its relation to the tool geometry. Both standardised thermocouples in the FSW tool and the novel “tool-workpiece thermocouple” method were used to record temperatures.

    Bead-on-plate welds in 20 mm thickness AA6082-T6 were produced while the temperatures were measured in three locations on the FSW tool: at the shoulder outer diameter, at the transition from shoulder to probe and at the probe tip. It was found that the hottest point in the stirred zone was 607 °C and was located at the transition between the shoulder and probe, on the retreating-trailing side of the tool. The lowest temperature was found at the probe tip on the retreating-leading side of the tool.

    The results offer a better understanding of the temperature distribution around a FSW tool. The method presented can be applied to verification of thermal simulation models, tool design optimization, quality assurance and temperature feedback control.

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