1 Ocak 2021 Dergi makalesi Açık Erişim

Demir, Kubra; Gavgali, Esma; Yetim, Ali Fatih; Akpinar, Salih

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    <subfield code="a">Structural adhesive joints used in aerospace are usually subjected to fatigue loading rather than static loading. This study experimentally and numerically investigated the static four-point bending loads of adhesively bonded joints after fully reversed four-point bend fatigue loading where nanoadhesives - obtained by adding carbon nanostructures into aerospace grade structural adhesive - were used to bond the joints. Single lap joint specimens were produced using a nanocomposite adhesive obtained by adding 1 wt % graphene, 1 wt % carbon nanotubesCOOH and 1 wt % fullerene C60 nanostructures to a DP460 structural adhesive. AA2024-T3 aluminum alloy and carbon fiber-reinforced composites (CFRCs) with a plain weave fabric (0/90 degrees) were used as adherend materials. First, static four-point bending tests were applied to these joints to obtain their strengths and then fully reversed sinusoidal fatigue tests were applied under a constant load amplitude, a frequency of 20 Hz and a load ratio of R = -1. Fatigue tests were performed over 1,000,000 cycles - accepted as an infinite life - at four different load levels by considering the strengths obtained from the static tensile tests. After obtaining the static four-point bending strengths of the joints to which fatigue loading was applied, the changes in the strengths of joints with and without fatigue testing were examined. The static strengths of aluminum joints bonded with nanoadhesive and subjected to fully reversed fatigue loading significant increased, depending on the nanostructure type added to the adhesive. Moreover, such increases in the strengths of joints are highly dependent on the adherend type (composite with [0/90]6 stacking sequence or AA2024-T3 aluminum).</subfield>
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    <subfield code="a">Demir, Kubra</subfield>
    <subfield code="u">Erzurum Tech Univ, Dept Mech Engn, TR-25050 Erzurum, Turkey</subfield>
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    <subfield code="a">10.1016/j.ijadhadh.2021.102943</subfield>
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    <subfield code="a">The effects of nanostructure additive on fracture strength in adhesively bonded joints subjected to fully reversed four-point bending fatigue load</subfield>
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    <subfield code="a">Yetim, Ali Fatih</subfield>
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