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  • 1.
    Akbarpour, S.
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Hallström, S.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Metal reinforcement around fastener holes in composites2016Inngår i: ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials, European Conference on Composite Materials, ECCM , 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    One way of improving the load capacity of bolted joints in composite components is to use metal inserts locally at the holes in order to reduce the bearing stress. In this paper an innovative local reinforcement concept is introduced where metal inserts are implemented in the form of stacked patches at the holes in order to improve the bearing strength of the composite. After doing some initial tests and a parameter study, some specimens with optimized stacked patch inserts were designed and tested. The specimens with optimized inserts show 50-60% improved bearing strength in pin-loaded tests which corresponds to a potential weight reduction of about 30%. These very promising results indicates that the efficiency of joints in composites can be improved significantly.

  • 2.
    Akbarpour, Sahar
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Hallström, Stefan
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Reinforcement around holes in composite materials by use of patched metal inserts2019Inngår i: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 225, artikkel-id 111084Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Metal inserts are sometimes used to improve the load carrying capacity of bolted joints in composite materials. In this paper a new concept is introduced where inserts are built during composite manufacturing by integrating stacked metal patches at locations where holes are to be made after consolidation. Initial tests and a parameter study enable more informed design, and specimens with improved stacked inserts are then produced and tested. The specimens with inserts show up to 60% strength improvement in pin-loaded tests. In addition to the experimental work, finite element analysis is performed to investigate the stress fields and the failure mechanisms. The model indicates that the singular stresses at the multi-material corner points are governing for the strength and give indications of the failure mechanisms. Some basic analytical estimates are also presented.

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