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Experimental investigation to the effects of thickness and material on mode II  fracture were performed. Tension-shear specimens made of aluminium alloy LC4CS  and 7050-T7452 with thicknesses of 2, 4, 8 and 14 mm were used. All crack tip  appearances and fracture profiles of the specimens were observed. Mode II  fracture toughness were calculated. It is shown that material and thickness play  an important role in mode II fracture. The fracture of LC4CS appears shear  fracture under all kinds of thicknesses, however the fracture of 7050-T7452 is  tensile fracture when thickness is larger or equal to 8mm, and shear initiation  along the original crack plane, then turnaround and tensile failure when  thickness is smaller than 8mm. Mode II fracture toughness is independent of  thickness

Experimental investigations of the influence of material and thickness on fracture under pure mode II loading