What triggers a microcrack in printed engineering parts produced by selective laser sintering on the first place?

J. Ibbett, B. Tafazzolimoghaddam, Hector Hernandez Delgadillo, J. L. Curiel-Sosa*

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    6 Citations (Scopus)

    Abstract

    The proximity of un-melted particles within Selective Laser Sintered (SLS) printed engineering parts made of Nylon-12 is found as a major triggering effect for cracking and ultimately failure. The numerical investigation, by means of the eXtended Finite Element Method (XFEM), was performed over samples with different arrangements of un-melted particles obtained experimentally. The onset and propagation of microcracks was simulated. This included inherently how the degree of particle melt (DPM) in SLS parts affects and controls both crack initiation and propagation. The results evidenced that a microcrack started invariably between the two closest un-melted particles in all numerical tests performed considering different arrangements of un-melted particles.

    Original languageEnglish
    Pages (from-to)588-597
    Number of pages10
    JournalMaterials and Design
    Volume88
    DOIs
    Publication statusPublished - 25 Dec 2015

    Keywords

    • Degree of particle melt
    • Fracture
    • Nylon
    • Particle
    • Sintering

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