Influence Parameters on the Essential Work of Fracture of 5754-H111 Aluminum Alloy Plate: Comparative Study

Abstract

Aluminum alloy 5754 is a medium strength alloy with excellent corrosion resistance especially to seawater and industrially polluted atmospheres. Aluminum alloy 5754-H111 shows good cold formability, high fatigue strength and fair machinability. The present work aims to develop the test specimen to obtain the Essential Work of Fracture EWF which based on the Ligament yielding observed to occur at the peak of the load-displacement curve. It Follow this, necking and tearing occur in the softening region. The plastic zone, however, expands as a result of the non-essential work of fracture being dissipated in the tearing process after yielding. For studding the effect of stress raiser on Essential Work of Fracture three procedure applied, First at high test speed second with holes third at pre-stress .This work contributes to the overall goal to model fracture behavior and crack propagation .Investigation the adhesion properties by static tests concerned with stress lines concentrations on different material volume have been achieve in the obtained results .The EWF method achieved 273 KJ/m² for 5 mm thickness and 63 KJ/m² for 1.8 mm thickness these values. The strain ratetest achieved high value of EWF is measurement as 330 kJ/m²for 5mm and 28 kJ/m²for1.8 mm. By applying holes near the crack, the toughness increased which has been presented at the high value of EWF measurement compared without holes that the 5 mm specimen's thickness achieves 380 KJ/m² and for 1.8 mm thickness 110 KJ/m². On pre-stress 20% the EWF measured 250 kJ/m²for 5mm and 20 kJ/m²for1.8 mm and continues for pre-stress 30% EWF measured 230 kJ/m²for 5mm and 15 kJ/m²for1.8 mm. Also pre-stress 40%The EWF measured 210kJ/m²for 5mm and 10 kJ/m²for1.8 mm. For pre-stress 50% the EWF achieve lowest value measured as 190 kJ/m²for 5mm. The reduction of prestress values related to the broken average of atomic bonds due to increase the pre-load applied on the specimens.

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