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    The effect of preload on failure response of glass-epoxy laminated composite bolted-joints with clearance
    (Sage Publications Ltd, 2007) Pakdil, Murat; Sen, Faruk; Sayman, Onur; Benli, Semih
    In this study, the effect of preload moments on failure response of glass-epoxy laminated composite bolted-joints with bolt/hole clearance was investigated. To evaluate the effects of bolted-joint geometry and stacking sequence of laminated plates on the bearing strength and failure mode, parametric analyses were performed, experimentally. Two different geometrical parameters, edge distance-to-hole diameter ratio (E/D) and plate width-to-hole diameter ratio (W/D), were examined. For this reason, the E/D ratio was selected from I to 5, whereas the W/D ratio was chosen from 2 to 5. Besides, preload moments were applied as 0, 3 and 6 Nm. Due to the estimating material parameters effect, laminated plates were oriented as three different groups, [0 degrees/0 degrees/90 degrees'/90 degrees],, [45 degrees/45 degrees/-45 degrees/-45 degrees and [60 degrees/60 degrees/-60 degrees/-60 degrees](s),, symmetrically. The experiments were also performed under a clearance for the diameters of the bolt and the circular hole for 5 and 6 mm, respectively. Experimental results showed that failure mode and bearing strength are strictly affected by the magnitude of preload moments. Additionally, if material and geometrical parameters of composite bolted-joints are changed, the failure response is completely influenced by this change.
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    Experimental failure analysis of mechanically fastened joints with clearance in composite laminates under preload
    (Elsevier Sci Ltd, 2008) Sen, Faruk; Pakdil, Murat; Sayman, Onur; Benli, Semih
    A failure investigation was performed to determine the failure mode and bearing strength of mechanically fastened bolted-joints in glass fiber reinforced epoxy laminated composite plates, experimentally. Two different geometrical parameters those are the edge distance-to-hole diameter ratio (E/D) and plate width-to-hole diameter ratio (W/D) were considered. For this purpose, E/D ratio was selected from 1 to 5, whereas W/D ratio was chosen from 2 to 5. Due to determining material parameters effect, laminated plates were stacked as three different group which are [0 degrees/0 degrees/45 degrees/-45 degrees](s), [0 degrees/0 degrees/45 degrees/45 degrees](s) and [0 degrees/0 degrees/30 degrees/30 degrees](s), symmetrically. In addition, the preload moments were applied as 0, 3 and 6 nm, since an important target of this study is to observe the changing of failure mechanism under various preloads. The experiments were also performed under a clearance, for this reason the diameters of the bolt and the circular bolt hole were fixed 5 and 6 mm, respectively. Results showed that failure modes and bearing strengths were considerable affected by the increasing of preloads. Furthermore, when the material and geometrical parameters of composite bolted-joints were changed, the failure behavior and the values of bearing strengths were fully influenced from this changing. (C) 2007 Elsevier Ltd. All rights reserved.