Design study of hole positions and hole shapes for crack tip stress releasing

Pauli Pedersen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The method of hole drilling near or at the crack tip is often used in fatigue damage repair. From a design optimization point of view, two questions are posed: Where should the hole(s) be drilled? And is there a better shape of the hole than a circular one? For the first question, we extend earlier results for isotropic material and in general study the influence of having orthotropic material.

    Optimal shapes are by no means circular, and we focus on the shape of a single hole centered at (or in front of) the crack tip. It is shown that the stress field at the crack boundary can be significantly improved by noncircular shapes. As a byproduct, an alternative method for extracting the stress intensity factor from a finite element analysis is presented.
    Original languageEnglish
    JournalStructural and Multidisciplinary Optimization
    Volume28
    Issue number4
    Pages (from-to)243-251
    ISSN1615-147X
    DOIs
    Publication statusPublished - Oct 2004

    Keywords

    • hole shape
    • orthotropic material
    • stress intensity factor
    • stress shielding

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