The Effect of Preload on Failure Response of Glass-Epoxy Laminated Composite Bolted-Joints with Clearance

Abstract

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 1 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°/0°/90°/90°]s, [45°/45°/—45°/—45°]s and [60°/60°/—60°/—60°]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.

Failure Response of Two Serial Bolted Joints in Composite Laminates

“…The Table 2 Mechanical properties of glass fiber-epoxy laminated composite material Fig. 1 [5][6][7][8][9], previously. The failure modes in inner and outer holes are similar for some tested specimens for example C/C (Cleavage/Cleavage) or B/B (Bearing/Bearing), whereas it is different for each holes for example C/S (Cleavage/Shear-out) or B/S (Bearing/Shear-out).…”

“…In that study, a procedure was set up to measure the bearing stiffness of a GRP laminate in a single-bolt double lap joint. Pakdil et al [7] analyzed the effect of preload moments on failure response of glass-epoxy laminated composite single bolted-joints with bolt/hole clearance. To determine the effects of bolted-joint geometry and stacking sequence of laminated plates on the bearing strength and failure mode, parametric analysis were performed, experimentally.…”

“…Schematic illustration of these failure modes are shown in Fig. 1 [5][6][7][8][9]. Additionally, combinations of these failure modes are possible in practical applications.…”

Failure loads of mechanical fastened pinned and bolted composite joints with two serial holes

“…The effects of different geometrical parameters on failure behaviors were also examined. Pakdil et al [19] determined the influence of preload moments on failure response of glass-epoxy laminated composite single bolted joints with bolt/hole clearance. To observe the effects of bolted-joint geometry and stacking sequence of laminated plates on the bearing strength and failure mode, parametric analyses were carried out, experimentally.…”

Failure Prediction of Cross-Ply Laminated Double-Serial Mechanically Fastened Composites using Fuzzy Expert System

“…Two glass composites of different fabrics and lay-ups were fabricated using vacuumassisted resin-transfer molding (VARTM) and tested using a double-lap joint arrangement. Pakdil et al [9] determined the influence of preload moments on the failure of glass-epoxy laminated composite single bolted-joints with bolt/hole clearance. In order to observe the effects of bolted-joint geometry and the stacking sequence of laminated plates on the bearing strength and failure mode, parametric analysis was applied, experimentally.…”