Change search
Refine search result
1 - 9 of 9
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Charles, Corinne
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Järvstråt, Niklas
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Development of a Microstructure Model for Metal Deposition of Titanium Alloy Ti-6Al-4V2007In: Ti-2007 : science and technology : proceedings of the 11th World Conference on Titanium (JIMIC 5): held at Kyoto International Conference Center, Kyoto, Japan, 3 - 7 June 2007, 2007, p. 1201-1205Conference paper (Refereed)
  • 2.
    Charles, Corinne
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Järvstråt, Niklas
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Finite Element Modelling of Microstructure on GTAW Metal Deposition of Ti-6Al-4V alloy2006In: Computer Technology in Welding and Manufacturing : 16th International Conference & Mathematical Modelling and Information Technologies in Welding and Related Processes: Kiev, Ukraine, June 6-8, 2006Conference paper (Other academic)
  • 3.
    Farajian-Sohi, Majid
    et al.
    University West, Department of Technology, Mathematics and Computer Science.
    Järvstråt, Niklas
    University West, Department of Technology, Mathematics and Computer Science.
    A fractographical investigation of weld toe imperfections in tandem gas metal arc welding2006In: Steel Research International, ISSN 1611-3683, Vol. 77, no 12, p. 889-895Article in journal (Refereed)
    Abstract [en]

    Prediction and control of flaws in welds play important roles in design of complex structures against fatigue and fracture failure. Cold laps - outer lack of fusion - are small geometrical imperfections at weld toes, which act as fatigue crack initiation sites and reduce the life of welded structures drastically. The aim of this work is to characterize and categorize different types of such imperfections in the tandem gas metal arc welding process and find the mechanisms of their formation. Tandem welding process with different welding parameters was used to produce bead-on-plate coupons. These coupons were then sliced to smaller specimens for further investigations. For studying the weld toes, all the specimens were hit in an impact test machine and then the fracture surfaces of welds and base materials were analysed by scanning electron microscopy (SEM). Two types of cold laps were observed at weld toes, namely overlap and spatter. Observation and measurement showed that these imperfections are in the form of micro cracks with depth between 0.1 to 1.5mm and length between 0.1 to 4 mm.

  • 4.
    Lorentzon, John
    et al.
    University West, Department of Engineering Science.
    Järvstråt, Niklas
    University West, Department of Engineering Science, Division of Production Engineering.
    Modelling tool wear in cemented-carbide machining alloy 7182008In: International journal of machine tools & manufacture, ISSN 0890-6955, E-ISSN 1879-2170, Vol. 48, no 10, p. 1072-1080Article in journal (Refereed)
  • 5.
    Lorentzon, John
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Järvstråt, Niklas
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Tool Wear Geometry Updating in Inconel 718 Turning Simulations.2006In: 9th CIRP International Workshop on Modelling of Machining Operation: Bled, Slovenia, 2006, p. 491-498Conference paper (Other academic)
    Abstract [en]

    In machining of nickel based superalloys, such as Inconel 718, tool wear is a major problem due to the high stresses and the high temperatures at the tool chip interface. Enhanced knowledge of the tool wear mechanism and capability to predict tool wear are therefore of great importance in machining of nickel based superalloys. The objective with this paper is to investigate if the finite element method (FEM) can be used to predict the flank and crater wear of uncoated cemented carbide tool in turning ofInconel 718. An empirical model has been implemented in a commercial FE-code and the tool

    geometry is continuously updated to capture the evolution of wear. Experiments have been conducted

    to obtain parameters for the empirical wear model and for validation of the simulations. The worn

    geometry at the flank and rake face as well as the cutting edge radius was measured with white light

    interferometry. Wear model parameters were calibrated by fitting a simulation against measured worn

    geometries at the flank and rake face. Then separate simulations at other cutting speeds were

    compared with corresponding experiments to validate the model performance.

  • 6.
    Lorentzon, John
    et al.
    University West, Department of Economics and IT, Division of Business Administration. University West, Department of Engineering Science, Division of Production Engineering.
    Järvstråt, Niklas
    University West, Department of Engineering Science, Division of Production Engineering.
    Josefson, B. L.
    Chalmers University of Technology, Department of Applied Mechanics.
    Modelling chip formation of alloy 7182009In: Journal of Materials Processing Technology, Vol. 209, no 10, p. 4645-4653Article in journal (Refereed)
  • 7.
    Majid, Farajian
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Järvstråt, Niklas
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    A imperfect fractographical investigation of weld toe ions in Tandem GMA welding2006In: Steel Research International, ISSN 1611-3683, Vol. 77, no 12, p. 889-895Article in journal (Refereed)
  • 8.
    Majid, Farajian
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Järvstråt, Niklas
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Surface geometry measurements and the experimental and numerical investigation of stress concentration in fillet welds2006In: 59th Annual Assembly and the International Conference of the International Institute of Welding: Sep, Quebec, Canada, 2006Conference paper (Other academic)
  • 9.
    Nordström, Michael
    et al.
    Saab Automobile AB.
    Järvstråt, Niklas
    University West, Department of Engineering Science, Division of Production Engineering.
    An appearance-based measure of surface defects2009In: International Journal of Material Forming, Vol. 2, no 2, p. 83-91Article in journal (Refereed)
1 - 9 of 9
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf