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    Failure response of two serial bolted joints in composite laminates
    (SOC Theoretical Applied Mechanics, 2011) Şen, Faruk; Sayman, O.
    In this study, the failure response of two serial bolted joints in composite laminates was investigated. The composite material was consisted of epoxy matrix and glass fibers. To find out the effects of joint geometry and stacking sequences on the failure response, parametric studies were performed experimentally. Three different geometrical parameters that were the edge distance-to-hole diameter ratio (E/D), plate width-to-hole diameter ratio (W/D) and the distance between two serial holes-to-hole diameter ratio (K/D) were investigated. Hence, E/D, W/D and K/D ratios were considered from 1 to 5, 2 to 5 and 3 to 5, respectively. In addition, the failure tests were carried out for a range of preload moments as 2, 3, 4, 5 Nm and without any preload moments as 0Nm. Tested composite laminates were oriented two different stacking sequences as [0 degrees] 8 and [0 degrees/0 degrees/90 degrees/90 degrees](s). Experimental results point out that failure response of two serial bolted composite joints are firmly effected from material parameters, geometrical parameters and the magnitudes of applied preload moments.
  • [ X ]
    Öğe
    The influences of geometrical parameters on the failure response of two serial pinned/bolted composite joints
    (Professional Engineering Publishing, 2009) Şen, F.; Sayman, O.
    In this study, the influences of geometrical parameters on the failure response of two serial pinned/bolted composite joints were analysed. The tested composite material consisted of epoxy matrix and glass fibres. It was oriented as [0 degrees/0 degrees/60 degrees/60 degrees](s), symmetrically. Three different geometrical parameters, which were the edge distance-to-hole diameter ratio (E/D), plate width-to-hole diameter ratio (W/D), and the distance between two serial holes-to-hole diameter ratio (K/D), were investigated, experimentally. Consequently, E/D, W/D, and KID ratios were designed from 1 to 5, 2 to 5, and 3 to 5, respectively. Additionally, the failure tests were performed for a range of preload moments as 2,3,4,5 Nm and without any preload moment as 0 Nm. Experimental results showed that the changing of geometrical parameters and the presence of preload moments affected failure behaviour of two serial pinned/bolted composite joints. Furthermore, the numerical failure analysis was also carried out via Lusas 13.6 code. Hashin failure criterion was preferred to determine both bearing strengths and failure modes. All in all, a good agreement is observed between experimental and numerical failure analyses.