- maximal endurable stress
- tensile strength
Tensile strength is a characteristic material parameter which can be derived form a tensile test. It is the stress defined as the internal force of resistance per unit of area perpendicular to the direction of load application with which a material reacts to an external tensile load of specific magnitude. At a material's tensile strength the deformation of the workpiece or the elongation of the tensile specimen due to the external tensile load continues to increase while only the inner resistance decreases in relation to the cross sectional area prior to the loading. The visual result of the tensile test is that the tensile specimen constricts locally at the material's tensile strength, whereas up to this point it stretched over its entire length. This constriction is the reason for the specimen's failure by breakage if subjected to further loading.
Tensile strength is derived from the quotient of the maximal load and the cross sectional area prior to loading. A material's tensile strength thus denotes its maximal endurable stress.