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Bolt-hole clearance effects on bearing strength of bolted joints in cross-ply, [0/90]2s,glass fiber reinforced epoxy (GFRE) composites, were investigated experimentallyand numerically. A series of ASTM tests (tensile, compressive and shear) wereconducted on a unidirectional laminates to find the lamina properties, which wereused as input to a 3D developed progressive damage model (PDM). The model wasbuilt with the aid of ABAQUS software, nonlinear Hashin failure criteria and Riccioproperty degradation rules. The PDM was used to predict the failure load and modeof composite bolted joint with bolt-hole clearance of 0, 50, 100, 200, 300 μm. Bearingstrength was determined according to three different criteria: load at 4% holedeformation, first peak load and ultimate load. The numerical results of the ultimatestrength agree well with the experimental ones with a maximum deviation of 7.1 %.Increasing the bolt-hole clearance from 0 to 300 μm reduces the contact area by17.8% and increasing the contact pressure by 26.6 %. Accordingly, the 4% HDS, firstpeak bearing strength, the measured ultimate strength and the predicted ultimatestrength were decreased respectively by 20.9%, 34.0%, 14.2% and 8.8%. On theother hand, the failure mode did not affected by increasing the bolt-hole clearancewithin the investigated values.

EXPERIMENTAL AND FINITE ELEMENT ANALYSIS OF BOLT-HOLE CLEARANCE EFFECTS IN COMPOSITE JOINTS