Ductile fracture toughness of Al 5754-H111 alloy using essential work of fracture method

Abstract

<abstract> <p>The aluminium alloy 5754 H-111 is a high-strength alloy with a remarkable corrosion resistance, particularly to seawater. It is widely used in the aerospace, marine, and automotive industries. In this work, the influence of fracture toughness methods applied to two thin aluminium sheets with different thicknesses (1.8 mm and 5 mm) was analysed. The first method was the essential work of fracture (EWF) method. It was applied at room temperature at a deformation rate of 1 mm/min with a double-edge notched tensile specimen (DENT) to measure the fracture toughness ($ {w}_{e} $) of a material with ductile damage based on the stored energy of the body. The second method was a compact tensile test (CT) to determine the linear elastic fracture toughness. For the EWF, DENTs of 4, 6, 10, 12, and 14 mm were used in the centre section. The EWF values were 273 kJ/m<sup>2</sup> and 63 kJ/m<sup>2</sup> for the aluminium sheets with thicknesses of 5 mm and 1.8 mm, respectively. The surface energies J<sub>IC</sub> determined using CT were 34.5 kJ/m<sup>2</sup> and 10.6 kJ/m<sup>2</sup>, respectively, for these sheets. These values are highly similar. Furthermore, the percentage errors of the elastic EWF were 5.8% and 8.4%, respectively, for the two thicknesses. The fractures were of the stress types in which the pits and voids grow in conjunction. In addition, both deep and isolated large dimples were well distributed in the aluminium, which is the main ductile deformation concept.</p> </abstract>

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

“…These structures, particularly those made of aluminium alloys, become increasingly susceptible to fatigue and failure under the combined influence of mechanical loads [2]. Aluminium alloys are essential in engineering because they provide a balance of strength and light weight [3][4][5][6]. Further technological advances enhanced the aluminium alloy, allowing it to be used in the aerospace industry [7].…”

Investigation of the Combined Influence of Temperature and Humidity on Fatigue Crack Growth Rate in Al6082 Alloy in a Coastal Environment

“…Aluminium has found extensive application in marine environments [3,4] due to its unique properties, including its light weight, corrosion resistance, and mechanical strength. However, in coastal conditions, where there are temperature and humidity variations [5], factors such as corrosion [6], fatigue loading [7], fatigue crack growth rate (FCGR) and fracture toughness [8][9][10][11] can affect its performance.…”