On the determination of local residual stress gradients by the slit milling method

C. Mansilla, D. Martinez-Martinez, V. Ocelik, J. Th M. De Hosson*

*Bijbehorende auteur voor dit werk

    OnderzoeksoutputAcademicpeer review

    25 Citaten (Scopus)
    300 Downloads (Pure)

    Samenvatting

    This paper concentrates on an extension of a rather new methodology to determine local residual gradients at an enhanced lateral resolution using the so-called slit milling technique. The method is based on stress relaxation by making a slit using a focused ion beam and the displacements are measured through digital image correlation so as to calculate the residual stress. Our novel approach consists of a multiple fitting procedure along the length of the slit instead of the commonly applied averaging method. The applicability of our approach is demonstrated when stress gradients exist. In accordance to the Saint-Venant principle in linear elasticity, longer slits are better than shorter slits because of end effects. The proof-of-principle is supported by measurements on steel under controlled bending and by finite element modeling.

    Originele taal-2English
    Pagina's (van-tot)3646-3655
    Aantal pagina's10
    TijdschriftJournal of Materials Science
    Volume50
    Nummer van het tijdschrift10
    DOI's
    StatusPublished - mei-2015

    Citeer dit