Experimental failure analysis of mechanically fastened joints with clearance in composite laminates under preload

Abstract 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°/0°/45°/−45°] s , [0°/0°/45°/45°] s and [0°/0°/30°/30°] 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.

[1]  P. Mallick.  Fiber-reinforced composites : materials, manufacturing, and design , 1989 .

[2]  H. Hahn,et al.  The Bearing strength of e-glass/vinyl-ester composites fabricated by vartm , 1998 .

[3]  T. Sınmazçelik,et al.  Geometric parameters and chemical corrosion effects on bearing strength of polyphenylenesulphide (PPS) composites , 2007 .

[4]  Fabrice Pierron,et al.  A Numerical and Experimental Study of Woven Composite Pin-Joints , 2000 .

[5]  Buket Okutan,et al.  The effects of geometric parameters on the failure strength for pin-loaded multi-directional fiber-glass reinforced epoxy laminate , 2002 .

[6]  Hiroyuki Hamada,et al.  Strength Prediction of Mechanically Fastened Quasi-Isotropic Carbon/Epoxy Joints , 1996 .

[7]  Ramazan Karakuzu,et al.  A study of the effects of various geometric parameters on the failure strength of pin-loaded woven-glass-fiber reinforced epoxy laminate , 2001 .

[8]  Liyong Tong,et al.  Bearing failure of composite bolted joints with non-uniform bolt-to-washer clearance , 2000 .

[9]  F. Cappello,et al.  On the Elastic Behavior of a Cross-Ply Composite Pin-Joint with Clearance Fits , 1999 .

[10]  O. Sayman,et al.  Failure analysis of pin-loaded aluminum–glass–epoxy sandwich composite plates , 2003 .

[11]  J. Reddy.  Mechanics of laminated composite plates : theory and analysis , 1997 .

[12]  Antonino Squillace,et al.  Experimental Characterization of an Innovative Glare® Fiber Reinforced Metal Laminate in Pin Bearing , 2003 .

[13]  M. Husnu Dirikolu,et al.  The effect of stacking sequence of carbon epoxy composite laminates on pinned-joint strength , 2003 .

[14]  J. Reddy.  Mechanics of laminated composite plates and shells : theory and analysis , 1996 .

[15]  Bulent Murat Icten,et al.  Progressive failure analysis of pin-loaded carbon–epoxy woven composite plates , 2002 .

[16]  Pedro P. Camanho,et al.  Stress analysis and strength prediction of mechanically fastened joints in FRP: A review , 1997 .

[17]  H. Whitworth,et al.  Failure analysis of composite pin loaded joints , 2003 .

[18]  R J Grant,et al.  A parametric study of the elastic stress distribution in pin-loaded tubes , 1994 .

[19]  Richard A. Scott,et al.  Strength of Mechanically Fastened Composite Joints , 1982 .