The tensile strength of aluminum is greater than the yield strength.
The yield strength corresponds to the yield point. The yield point refers to the point where the metal undergoes plastic deformation, and the corresponding strength becomes the yield strength. Tensile strength refers to the ability of a material to resist external forces, generally the strength at which it breaks in a tensile test.
tensile strength:
When the aluminum material is yielded to a certain level, due to the rearrangement of the internal crystal grains, its resistance to deformation is improved again. At this time, although the deformation develops rapidly, it can only increase with the increase of stress until the stress reaches the maximum value.
After that, the ability of the aluminum material to resist deformation is significantly reduced, and a large plastic deformation occurs at the weakest point, where the cross section of the specimen shrinks rapidly, and the phenomenon of necking occurs until it breaks. The maximum stress value (corresponding to point b) before the aluminum material is subjected to tensile fracture is called the strength limit or tensile strength.
Yield Strength:
When the stress exceeds the elastic limit, the deformation increases rapidly. At this time, in addition to elastic deformation, some plastic deformation occurs. When the stress reaches point B, the plastic strain increases sharply, and a small plateau fluctuates in the curve, which is called yielding.
The maximum and minimum stresses at this stage are called the upper yield point and the lower yield point, respectively. Since the value of the lower yield point is relatively stable, it is used as an indicator of material resistance, called the yield point or yield strength.