The Stress-Strain graph shows that the aluminum wire experienced most plastic deformation, and this is reflected by the higher percentage elongation.
The copper wire displayed a highest toughness.The surface of the fracture also possessed a cup and cone geometry. (copper wire specimen 1 and 4 fracture at grib)
In summary, tensile properties should be considered as important design parameters for the selection of engineering materials for their desired application. Engineers have played a significant role in that they should be able to analyze and understand material behavior and properties through these mechanical testing parameters.