Direct Observation of Asperity Deformation of Specimen with Random Rough Surface in Upsetting Process

A. Azushima, S. Kuba, S. Tani, David Dam Olsson

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The trapping behavior of liquid lubricant and contact behavior of asperities at the workpiece-tool interface during upsetting and indentation are observed directly using a compression subpress which consists of a transparent die made of sapphire, a microscope with a CCD camera and a video system. The experiments are carried out without lubricant and with lubricant. Specimens used are commercially pure A1100 Aluminum with a random rough surface. From this observation, the change in the fraction of real contact area is measured by an image processor. The real contact area ratios in upsetting experiment without lubricant are in good agreement with numerical ones obtained by Wanheim and Bay and Makinouchi et al. The real contact area ratios in indentation experiments without lubricant increase linearly with increasing normal stress up to 350MPa. The real contact area ratios after upsetting and indentation experiments remain a contact of about 60%.
    Original languageEnglish
    Title of host publicationProc. of the 2nd ICTMP
    EditorsN. Bay a.o.
    Place of PublicationVedbæk
    PublisherIKON Tekst & Tryk A/S
    Publication date2004
    Publication statusPublished - 2004
    Event2nd International Conference on Tribology in Manufacturing Processes - Nyborg, Denmark
    Duration: 15 Jun 200418 Jun 2004
    Conference number: 2

    Conference

    Conference2nd International Conference on Tribology in Manufacturing Processes
    Number2
    CountryDenmark
    CityNyborg
    Period15/06/200418/06/2004

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