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1

Optimization of process parameters on friction stir welding of AA 6082-T6 butt joints using Taguchi method

Arab M., Zemri M.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 4

1371--1380

EN

Friction Stir Welding (FSW) was carried out on Aluminum Alloy 6082-T6 plates with dimensions of 200 x 70 x 2 mm. Design of Experiment (DOE) was applied to determine the most important factors which influence the Ultimate Tensile Strength (UTS) and Hardness (HV) of AA 6082-T6 joints produced by Friction Stir Welding (FSW). Effect of two factors which include tool rotational speed and welding speed on (UTS, HV) were investigated by Taguchi method using L9 orthogonal array to find the optimum process parameters. An analysis of variance (ANOVA) was carried out to determine which of the selected factors are more significant on both of responses, the optimum parameters for the higher UTS it found by using a rotational speed of 1400 rpm and 125 mm/min for the welding speed, also 1400 rpm and 160 mm/min to maximize Hardness (HV).

2

Fatigue crack growth rate, microstructure and mechanical properties of diverse range of aluminum alloy: a comparison

Brahami A., Bouchouicha B., Zemri M., Fajoui J.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 1

329–-339

EN

In practice for all metallic materials, damage by fatigue usually takes in two steps, the appearance of an initial crack which then grows as a function of the present microstructure. The objective of this study is to identify the elements influencing the fatigue crack growth rate on aluminum alloys of different microstructures. Characterization tests and microstructural analysis on 2024-T3, 5083-H22, 6082-T6 and 7075-T6 shades have been carried out. Based on the experimental results obtained, AA7075-T6 has the best fatigue crack rate resistance which is explained by its behavior as well as the nature and dispersive distribution of the secondary element.

3

Fatigue crack growth rate, microstructure and mechanical properties of diverse range of aluminum alloy: a comparison

Brahami A., Bouchouicha B., Zemri M., Fajoui J.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 4

1453--1462

EN

In practice for all metallic materials, damage by fatigue usually takes in two steps, the appearance of an initial crack which then grows as a function of the present microstructure. The objective of this study is to identify the elements influencing the fatigue crack growth rate on aluminum alloys of different microstructures. Characterization tests and microstructural analysis on 2024-T3, 5083-H22, 6082-T6 and 7075-T6 shades have been carried out. Based on the experimental results obtained, AA7075-T6 has the best fatigue crack rate resistance which is explained by its behavior as well as the nature and dispersive distribution of the secondary element.

4

Effect of heat treatment parameters on mechanical properties of medium carbon steel

Blaoui M. M., Zemri M., Brahami A.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 4

909--918

EN

Engineering materials, mostly steel, are heat treated under controlled sequence of heating and cooling to alter their physical and mechanical properties to meet desired engineering applications. This paper presents a study of the influence of austenitization temperature, cooling rate, holding time and heating rate during the heat treatment on microstructure and mechanical properties (tensile strength, yield strength, elongation and hardness) of the C45 steel. Specimens undergoing di erent heat treatment lead to various mechanical properties which were determined using standard methods. Microstructural evolution was investigated by scanning electron microscopy (SEM). The results revealed that microstructure and hardenability of the C45 steel depends on cooling rate, austenitization temperature, holding time and heating rate.