Aluminium stress-strain relationships are crucial in understanding the mechanical behavior of aluminium and its alloys under varying loads. Stress, defined as force per unit area, and strain, representing deformation, are key parameters in stress-strain curves that depict the material’s response to applied forces. The elastic modulus, yield strength, and tensile strength are vital properties derived from these curves. Aluminium stress-strain behavior is influenced by factors like alloy composition, heat treatment, and loading conditions, and its analysis helps optimize material selection, design, and manufacturing processes in industries such as aerospace, automotive, and construction.