Effect of Specimen Extraction Method on Surface Condition and Mechanical Performance of 2024-T3 Aluminum Alloy

Résumé fourni par la source

Certain mechanical properties, such as tensile strength, depend on the surface finish, which is itself influenced by the material removal process used.In sheet metal manufacturing, tensile test specimens can be cut by abrasive water jet (AWJ), wire electrical discharge machining (WEDM), laser, or plasma machining, rather than by conventional milling.This work aims to evaluate the effect of the test piece extraction method on surface condition, dimensional accuracy, and mechanical performance through tensile tests performed on 2024-T3 aluminum alloy plates.The test pieces were prepared using different techniques: AWJ, WEDM, and conventional milling.The surface roughness was measured using a roughness tester, and tensile tests were then carried out to determine the mechanical properties.The results revealed that the total roughness (Rz) varied significantly depending on the extraction method: milling produced the smoothest surfaces (Rz: 12.4-14.7 µm), followed by WEDM (Rz: 27.3-33.3µm), and abrasive waterjet (Rz: 37.3-46.3µm).Despite these differences, the impact on tensile properties remained within 5%, with the largest deviation recorded for elongation at break (-4.87% for AWJ) and the smallest for yield strength (± 1.9%).These findings suggest that WEDM and AWJ can serve as viable alternatives to milling for specimen extraction when deviations up to 5% are acceptable.

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